Park Air Systems B6100-S2 VHF fixed ground based aeronautical receiver User Manual t6r
Park Air Systems Limited VHF fixed ground based aeronautical receiver t6r
Contents
- 1. User guide
- 2. Brochure
User guide
T6R VHF Multimode Receiver
Select Topic
Back to
Main Page
Specification Operation Installation Maintenance
This documentation is applicable to receivers at Mod strike 7
Approvals and
Standards
Back to Receiver
Main Page
Approvals and Standards T6R VHF Receivers
The following standards are applied:
EMC EN 301 489-1; EN 301 489-22.
Health & Safety, EN 60950, CAN/CSA-C22.2 No. 60950, UL 60950.
Radio EN 300 676, IC RSS141, FCC part 15.
Telecom CS-03.
Approvals:
Standards:
The equipment is designed to meet the essential requirements of Directives
1999/5/EC, 89/336EEC as amended by Directive 93/68/EEC, and 72/23/EEC.
FCC Statement:
This device has been tested and found to comply with the limits for a Class B digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
❑Reorient or relocate the receiving antenna.
❑Increase the separation between the equipment and the receiver.
❑Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
❑Consult the supplier or an experienced radio/TV technician for help.
Operation on 8.33 kHz channel spacing is restricted to European customers.
Back to Transmitter
Main Page
Specification
This section gives the specification applicable to the T6T VHF Multimode Transmitter
operating in AM modes, Mode 2 and Mode 3.
All radios operate in AM-voice mode. Additional software must be loaded to allow AM-MSK,
Mode 2 and Mode 3.
T6T 50 W VHF Transmitter Page 2 Specification
Back to Transmitter
Main Page
General Specification
The general specification applies to a transmitter irrespective of the selected operating mode. Separate
listings are given for AM modes, Mode 2 and Mode 3.
Variants
The T6T VHF Multimode Transmitter is available in the variants as listed in Table 1.
Frequency accuracy
All variants except HS Better than 1 ppm.
HS variants Better than 0.3 ppm.
Number of Channels
All variants The transmitter has a multichannel capability. 100 channels can be
stored and recalled.
Power Requirements
The transmitter operates from an ac mains supply, or a dc input supply. When both supplies are
connected, the dc input acts as an automatic backup for the ac mains.
ac input supply The transmitter operates from a 48 to 62 Hz single-phase ac supply
and automatically adjusts to operate from any supply voltage ranging
from 110 Vac to 240 Vac ±10%. The power consumption figures are
given in Table 2.
dc input supply The transmitter operates from a dc input supply between 21.6 and
32 V (measured at the radio’s input). Current loading is given in
Table 2.
Table 1 Transmitter Variants
Description Part Number Frequency Range Special Applications
50 watt standard frequency
coverage transmitter B6350/NB/50 118 to 136.975 MHz Supports 2, 3 and 4-offset
carrier operation
50 watt extended frequency
coverage transmitter
B6350/WB/50 112 to 155.975 MHz Supports 2, 3 and 4-offset
carrier operation
50 watt, high stability, standard
frequency coverage transmitter B6350HS/NB/50 118 to 136.975 MHz Supports 5-offset carrier
operation
50 watt, high stability, extended
frequency coverage transmitter
B6350HS/WB/50 112 to 155.975 MHz Supports 5-offset carrier
operation
T6T 50 W VHF Transmitter Page 3 Specification
Back to Transmitter
Main Page
Dimensions and Weight
The dimensions and weight of the transmitter are:
Width 483 mm (19 inches).
Height 88.9 mm (3.5 inches). The height occupies 2U of equipment cabinet
space.
Depth 430 mm (16.9 inches) measured from front panel to rear panel.
450 mm (17.8 inches) measured from front panel to rear of fan.
Weight 13.5 kg (29.76 pounds).
Environmental
Temperature range The transmitter operates to specification across the temperature
range of -20°C to +55°C.
The transmitter can be stored at temperatures ranging from
-30°C to +70°C without causing any damage.
Humidity The transmitter operates to specification at a relative humidity
between 5% and 90% non-condensing.
Altitude The radios operate to specification up to 15,000 feet. Additionally the
equipment is capable of storage at altitudes up to 50,000 feet without
damage.
Shock and vibration The radios comply with shock and vibration protection MIL-STD-810E,
method 516.4, procedure VI - Bench Handling.
Ventilation The transmitters are cooled by an integral fan, which normally runs at
half speed. At an RF PA temperature of 45°C this is increased to full
speed and at 40°C it reduces to half speed again.
The transmitters also include an additional temperature controlled fan
contained in the power supply.
Warm up time All variants are fully operational to specification within 20 seconds
after switch on except the T6T HS, which is fully operational within 20
seconds but can takes up to 10 minutes to achieve frequency
accuracy for offset carrier.
Table 2 Power Consumption
Requirement Normal Operation
ac dc
Maximum 500 VA 12 A
Not Transmitting 60 VA 1 A
T6T 50 W VHF Transmitter Page 4 Specification
Back to Transmitter
Main Page
AM Modes
The transmitter can operate in AM-Voice mode (standard) and AM-MSK mode (optional). The following
specifications apply to both modes unless stated otherwise.
Transmitter RF Characteristics
RF Power Output
The RF carrier output power is adjustable in 1 W steps from 5 W to 50 W (as an option, the maximum
selectable power can be limited). Output power is automatically controlled under the following conditions:
Frequency range Variations in power remain within -0 to +1 dB over the operational
frequency range.
Low supply voltage Variations in power remain within ±1 dB for supply voltages between
24 Vdc and 32 Vdc.
High VSWR Loop error can reduce power progressively by up to 3 dB. Variations
in power remain within ±1 dB into a VSWR of up to 2.5:1. At a VSWR
greater than this the output power may be reduced by 10 dB ±1 dB.
High RF PA temperature If the RF PA temperature sensor exceeds 80°C the output power is
reduced by 3 dB ±1 dB. If the RF PA temperature sensor exceeds
90°C the transmitter is de-keyed and automatically re-keyed at 70°C.
Duty Cycle
All variants 100% continuous operation.
Channel Spacing
AM-Voice mode The transmitters are capable of both 25 kHz channel spacing and
8.33 kHz channel spacing.
AM-MSK mode 25 kHz.
Offset Carrier
Non-HS variants (AM-Voice) The non-HS T6T is capable of offsetting the carrier frequency to
provide 2, 3 and 4 carrier offset.
HS variants (AM-Voice) The HS T6T is capable of offsetting the carrier frequency to provide 2,
3, 4 and 5 carrier offset.
AM-MSK mode Offset carrier is not available.
Harmonic Outputs
All variants Second harmonic outputs are less than -36 dBm, third harmonic
outputs are less than -46 dBm and fourth harmonic outputs and above
up to 4 GHz, are less than -56 dBm.
T6T 50 W VHF Transmitter Page 5 Specification
Back to Transmitter
Main Page
Spurious Outputs
All variants The spurious outputs are less than -46 dBm for modulation depths up
to 90%, measured at greater than 500 kHz from carrier in the
frequency range 9 kHz to 4 GHz. There are no coherent spurious
outputs above the spectral mask at less than 500 kHz.
Intermodulation
All variants Intermodulation products, caused by an interfering signal with the
same power as the transmitter isolated by 30 dB, are at least -40 dBc
at ≥±150 kHz and -50 dBc at ≥±500 kHz.
Transmitter Modulation Characteristics
The transmitter modulation characteristics are as follows:
Mode
AM-Voice AM-Voice mode uses Double Sideband (DSB) Amplitude Modulation
(AM) full carrier; emission designator 6K80A3EJN for 25 kHz
channels and 5K00A3EJN for 8.33 kHz channels.
AM-MSK AM-MSK mode uses Double Sideband (DSB) Amplitude Modulation
(AM) full carrier; emission designator 13K0A2DJN.
Modulation Depth
All variants The transmitter is capable of modulation depths up to 95%.
Hum and Noise
All variants The hum and noise is more than 45 dB below the signal level for line
input levels <-13 dBm, and more than 50 dB below the signal level for
line input levels ≥-13 dBm, for a carrier modulated by a 1 kHz signal
with a modulation depth of 90%.
Frequency Response
25 kHz channel spacing AM-Voice and AM-MSK: The variation in frequency response with
reference to a 1 kHz signal is within +0.5 dB and -1.5 dB across the
frequency range 300 to 3400 Hz. The response is also less than -20
dB at 100 Hz and below, and less than -30 dB at 4 kHz and above.
8.33 kHz channel spacing AM-Voice only: The variation in frequency response with reference to
a 1 kHz signal is within +0.5 dB and -1.5 dB across the frequency
range 350 Hz to 2500 Hz. The response is also less than -10 dB at 100
Hz and below, and less than -30 dB at 3200 Hz and above.
Distortion
25 kHz channel spacing The total harmonic distortion is less than 5% due to signals with a
modulation depth of 90%, within the frequency range 300 Hz to
3400 Hz.
8.33 kHz channel spacing AM-Voice only: The total harmonic distortion is less than 5% due to
signals with a modulation depth of 90%, within the frequency range
350 Hz to 2500 Hz.
T6T 50 W VHF Transmitter Page 6 Specification
Back to Transmitter
Main Page
Residual FM
All variants For a test signal of 1 kHz set at 80% modulation depth applied to the
line input of the transmitter, the unwanted peak frequency modulation
does not exceed ±500 Hz.
VOGAD
AM-Voice The VOGAD has an operational range of 30 dB. The VOGAD can be
disabled.
AM-MSK The VOGAD is disabled.
Mute
AM-Voice The mute level is set at 15 dB below the average speech line level
setting. The mute can be disabled.
AM-MSK The mute is disabled.
Differential Group Delay
AM-MSK There is less than 60 µs differential group delay for signals in the
range 1200 to 2400 Hz.
Transmitter Control
Transmitter control characteristics are as follows:
Audio Inputs
All variants Voice can be connected to the transmitter via the front panel
microphone connector. Voice can also be connected via the line
inputs. Line level setting from -30 to +10 dBm.
PTT Time Out
All variants The time out period is adjustable from 2 to 510 seconds in 2 second
steps or can be disabled.
T6T 50 W VHF Transmitter Page 7 Specification
Back to Transmitter
Main Page
Mode 2
This section gives the transmitter’s specification applicable to Mode 2 operation. Mode 2 parameters are
identical to AM-Voice mode parameters with the following exceptions:
RF Power Rise Time
All models The transmitter produces more than 90% of full power output within
the first 2 symbols of the power stabilization segment, which is the first
segment of the training sequence and consists of 4 symbols each
representing 000.
RF Power Decay Time
All models The output power decays by more than 20 dB within 2.5 symbols of
the middle of the final symbol.
Channel Spacing
All models 25 kHz channel spacing only.
Transmitter Modulation Characteristics
Mode
All models Mode 2 uses Carrier Sense Multiple Access (CSMA) differentially
encoded 8-phase shift keying (D8PSK), using a raised cosine filter
with α=0.6 (nominal value), emission designator 14K0G1DE.
Information is differentially encoded with 3 bits per symbol transmitted
as changes in phase rather than absolute phase. The data stream is
divided into groups of 3 consecutive data bits, least significant bit first.
Zeros are padded to the end of transmissions if needed for the final
channel symbol.
Modulation Rate
All models The symbol rate is 10,500 symbols/second (±0.005%), resulting in a
nominal bit rate of 31,500 bits/s.
RMS Phase Error
All models The RMS phase error is less than 3°. The error vector magnitude is
less than 6%.
Phase Acceleration
All models The total frequency change during the transmission of the unique word
is less than 10 Hz. After this, the phase acceleration is less than
500 Hz/s.
T6T 50 W VHF Transmitter Page 8 Specification
Back to Transmitter
Main Page
Mode 3
This section gives the transmitter’s specification applicable to Mode 3 operation. Mode 3 parameters are
identical to AM-Voice mode parameters with the following exceptions:
RF Power Rise Time
All models The transmitter produces more than 90% of full power output within
the first 2 symbols of the power stabilization segment, which is the first
segment of the training sequence and consists of 4 symbols each
representing 000.
RF Power Decay Time
All models The output power decays by more than 20 dB within 2.5 symbols of
the middle of the final symbol.
Channel Spacing
All models 25 kHz channel spacing only.
Transmitter Modulation Characteristics
Mode
All models Mode 3 uses Time Division Multiple Access (TDMA) differentially
encoded 8-phase shift keying (D8PSK), using a raised cosine filter
with α=0.6 (nominal value), emission designator 14K0G7WET.
Information is differentially encoded with 3 bits per symbol transmitted
as changes in phase rather than absolute phase. The data stream is
divided into groups of 3 consecutive data bits, least significant bit first.
Zeros are padded to the end of transmissions if needed for the final
channel symbol.
Modulation Rate
All models The symbol rate is 10,500 symbols/second (±0.005%), resulting in a
nominal bit rate of 31,500 bits/s.
RMS Phase Error
All models The RMS phase error is less than 3°. The error vector magnitude is
less than 6%.
Phase Acceleration
All models The total frequency change during the transmission of the unique word
is less than 10 Hz. After this, the phase acceleration is less than
500 Hz/s.
End of document
Back to Transmitter
Main Page
Operation
This document describes the controls, indicators, setting up and operating instructions
applicable to the T6T VHF Multimode Transmitter.
T6T VHF 50 W Transmitter Page 2 Operation
Back to Transmitter
Main Page
Controls, Indicators and Front Panel Connectors
This part details the purpose of all controls and indicators of the T6T transmitters.
Front Panel
The front panel’s controls, indicators and connectors are shown below and detailed in the following
paragraphs.
Scroll/Select Switch and LCD
The Scroll/Select switch is used in conjunction with the LCD to select most of the transmitter's operational
settings. Use of the switch and LCD is fully detailed in this section applicable to the particular operating
mode. During normal operation, the LCD shows the operating frequency, the channel number (if the
channel store facility is used), the carrier offset (if used), and displays a graphical representation of
instantaneous peak power.
The example LCD screen above shows the transmitter operating on 118.000 MHz; the frequency has
been preset as channel 100 and offset at +7.3 kHz.
Ready Indicator
A green indicator that lights when the transmitter is ready for use and no BIT faults have been detected.
Transmit Indicator
An amber indicator that lights when the transmit circuit is keyed and producing output power.
Alarm Indicator
A red indicator that either flashes, or lights, when a BIT fault has been detected. BIT indications are
classified as either Alarms or Alerts.
If an ‘alert’ condition is detected, the Alarm indicator flashes, the Ready indicator remains lit, and the
transmitter remains operational. A BIT ‘alert’ is indicated if:
❑If the transmitter RF output power has reduced from its setting by more than 1 dB but not more
than 3 dB.
❑If the supply volts falls below a pre-defined level.
Any other BIT condition results in an alarm. When detected, the Alarm indicator lights and the Ready
indicator becomes unlit; the transmitter cannot be used.
READY
ALARM
TRANSMIT
STANDBY SCROLL/
SELECT
MICROPHONE/
DIAGNOSTICS
REFERENCE
F r e q 1 1 8 .0 0 0 M H z
C h 1 0 0 + 7 . 3 k H z
P w r
Scroll/Select SwitchLCD
M o d e A M V o i c e 1
T6T VHF 50 W Transmitter Page 3 Operation
Back to Transmitter
Main Page
Standby Indicator
A red indicator that lights when the transmitter is in standby mode. When in standby mode, most of the
radio's circuits are inactive, the front panel LCD is blanked, and the transmitter cannot be keyed.
Standby mode is selected and deselected using the front panel Scroll/Select switch and LCD, by initiating
an instruction through a MARC system, through a T6 controller or through the VFP. For details of front
panel selection and deselection see page 13.
Reference Connector
An SMB jack socket that allows a frequency counter to monitor the transmitter's reference frequency.
This connector is used only for maintenance purposes. The instructions for checking and adjusting the
reference frequency are given in the Maintenance section.
Microphone/Diagnostics Connector
A dual purpose connector that allows either a microphone, or a PC, to be connected to the transmitter.
The connector is a 7-pin self-locking DIN socket; the pin-out is shown in Table 1.
A microphone is fitted to this connector to enable the transmitter to be operated in AM local mode. The
connections are detailed in Table 1. A PC can also be connected to allow the VFP to be displayed. Using
the VFP is detailed in the Maintenance section. The PC connections at the transmitter are shown in
Table 2 on page 4.
Table 1 Microphone/Diagnostics Connector - Audio Connections
Pin
Number Signal Input or
Output Description
1 Microphone ground - 0 V.
3 Microphone PTT Input 0 V to PTT.
5 Sidetone Output 0 to 3 V pk-pk.
6 Microphone input Input 2 to 35 mV rms on Passive setting and 8 to 140 mV rms on
Active setting to remain in VOGAD range.
7 Ground - 0 V.
Viewed from front
T6T VHF 50 W Transmitter Page 4 Operation
Back to Transmitter
Main Page
Rear Panel Power Switch
The rear panel's power switch is a 2-way rocker switch used to select between power on, and standby.
When the POWER SWITCH is set to the Standby position, dangerous voltages are still
present in the transmitter's internal power supply circuitry. To ensure safe working, the
transmitter must be isolated from the ac and dc input supplies.
Table 2 Microphone/Diagnostics Connector - PC Connections
Pin
Number Signal Input or
Output Description
2 Transmit data Output RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no
handshaking.
4 Receive data Input RS232, 115200 baud, 8 data bits, 1 stop bit, no parity, no
handshaking.
7 Ground - 0 V.
WARNING Dangerous Voltages
= Standby= On
T6T VHF 50 W Transmitter Page 5 Operation
Back to Transmitter
Main Page
Setting Up and Operation
Introduction
Setting up the transmitter involves selecting various parameters using the Virtual Front Panel (VFP),
through a Multi-Access Remote Control (MARC) system, from a T6 controller, or from the transmitter’s
front panel. The transmitter can be configured for remote or local use.
Table 9 on page 30 details the functions and parameters that can be set from all these sources.
The rest of this document details how to configure the transmitter from the front panel, and how to operate
the radio in local mode.
Selecting most of the transmitter's operational settings is carried out using the front panel Scroll/Select
switch and the LCD (see the illustration below). No attempt to set up the transmitter should be made until
the transmitter has been installed as per the installation procedures given in the Installation section.
Normal Operation
During normal operation, the LCD displays the Main screen. This screen shows the operating frequency,
the channel number (if the channel store facility is used), the carrier offset (if used), and displays a
graphical representation of output power when the transmitter is keyed. If the transmitter has been set to
Standby mode, which is shown by the front panel Standby indicator being lit, the LCD is blanked.
Using the Scroll/Select Switch
The Scroll/Select switch (referred to throughout this section as the ‘Switch’) is used to leave the Main
screen and display the Control screen (see page 8). Further use of the Switch displays various selection
menus and allows the required parameters to be set. The switch has three actions: it can be turned
clockwise, anti-clockwise, or momentarily pushed in.
READY
ALARM
TRANSMIT
STANDBY SCROLL/
SELECT
MICROPHONE/
DIAGNOSTICS
REFERENCE
F r e q 1 1 8 .0 0 0 M H z
C h 1 0 0 + 7 . 3 k H z
P w r
Scroll/Select SwitchLCD
M o d e A M V o i c e 1
T6T VHF 50 W Transmitter Page 6 Operation
Back to Transmitter
Main Page
Screen Protocol
The following protocol is applicable to all screens described in this document.
Main Screen During normal operation, the Main screen (an example of which is shown below
whilst the transmitter is transmitting) is displayed.
Switch Refers to the front panel Scroll/Select switch. The switch is turned clockwise to scroll
through fields from left to right, and from top to bottom. The switch is turned
anti-clockwise to scroll through fields from right to left, and from bottom to top. The
switch is pressed to make a selection.
Time out If during any setting up procedure the Scroll/Select switch is not operated for
30 seconds, the display returns to the Main screen. If editing any parameter has not
been completed, the transmitter stays on the original setting.
>> Indicates more fields are available other than those currently displayed. To access
those fields, turn the switch clockwise through the last displayed field.
<< Indicates more fields are available other than those currently displayed. To access
those fields, turn the switch anti-clockwise through the first displayed field.
Back When Back is selected, you are returned to the previous menu.
Exit When Exit is selected, you are returned to the Main screen.
Menu System
The front panel control of the radio is implemented through a hierarchical menu system as shown on the
following page.
F r e q 1 1 8 . 0 0 0 M H z
C h 1 0 0 + 7 . 3 k H z
M o d e A M V o i c e
Pwr IIIIIIIIII
T6T VHF 50 W Transmitter Page 7 Operation
Back to Transmitter
Main Page
Menu System
F r e q 1 1 8 . 0 0 0 M H z
Ch100
M o d e A M V o i c e
Pwr IIIIIIIIII
Settings
Set the
transmitter
operational
settings
BIT
Initiate a BIT
test and view
results
Standby
Enter or Exit
standby mode
Ref Freq
Adjust the
transmitter
reference
frequency
Band Edges
Set up the
transmitter
band edges
Polarities
Set the active
polarity for
certain hardwire
connections
Backlight
Adjust the
display’s
backlight
AM-Voice Mode
Settings
(see page 16)
AM-MSK Mode
Settings
(see page 18)
Digital Modes
(see page 19)
Mode and
Mode
Settings
Select Mode
Menu Lock Screen
(see page 8)
Main Screen
(Example)
Displayed during normal
transmitter operation
Frequency
Set the
transmitter
operating
frequency
Channel
Set or recall up
to 100 preset
frequency
channels
Control Screen
Configure the transmitter
operating parameters, access
the BIT facility or view the
software configuration.
S/W Config
View the
transmitter
software
configuration
T6T VHF 50 W Transmitter Page 8 Operation
Back to Transmitter
Main Page
Menu Lock Screen
A security facility available only from the VFP allows the transmitter's front panel to be ‘locked’. When
this facility is active, no operational settings can be made from the front panel until an ‘unlock’ command
is sent from the VFP.
The following screen is displayed when ‘lock’ is active, and the front panel switch is pressed.
To exit the system lock screen:
❑Select OK, then press the switch. You are returned to the Main screen.
or,
❑Wait for the 30 second time-out to expire. You are returned to the Main screen.
Control Screen
The Control screen is entered from the Main screen by pressing the switch. The following screen is
displayed:
S E C U R I T Y M E S S A G E
F r o n t P a n e l
L o c k e d
O K
F r e q u e n c y
Channel
S e t t i n g s
E x i t > >
B I T
S / W C o n f i g
S t a n d b y
E x i t < <
Change the transmitter’s operating frequency.
Store or recall preset channel frequencies.
Select operating mode and mode settings.
Initiate a BIT test and view results.
View software configuration.
Enter or exit standby mode.
T6T VHF 50 W Transmitter Page 9 Operation
Back to Transmitter
Main Page
Notes for Setting Up the Transmitter
The following notes should be read before setting up the transmitter. They advise on the special
frequency display when using 8.33 kHz channel spacing, and give guidance on the optimum line level
settings. Note that for operation in the United States of America, this equipment is certified only for
operation using 25 kHz channel spacing.
Front Panel Display for 25 kHz and 8.33 kHz Channel Spacing
When setting the operating frequency of the transmitter and 8.33 kHz channel spacing is required, the
displayed frequency differs from the actual channel frequency. Table 3 shows the pattern used for
25 kHz and 8.33 kHz spaced channel frequencies from 118.000 MHz to 118.141 MHz. The pattern is the
same for any frequency within the transmitter's frequency range. The display conforms to ICAO
convention for 8.33 kHz operation.
Line Level Settings
The input line level setting displayed on the front panel is equivalent to the average speech level with a
peak-to-average ratio of 13 dB. This corresponds to the level specified for the lines.
When testing the transmitter using a sine wave, the line input level should be set to 10 dB above the line
level setting. The VOGAD and mute thresholds are pre-set at 10 dB and 15 dB respectively below the
line level setting.
Table 4 shows the relationship between the input line level, VOGAD threshold and mute threshold.
Table 3 25 kHz and 8.33 kHz Channel Spacing Displays
Actual Frequency
(to 4 decimal places) Channel Spacing Displayed Frequency
at Transmitter's Front Panel
118.0000 MHz
118.0000 MHz
118.0083 MHz
118.0166 MHz
118.0250 MHz
118.0250 MHz
118.0333 MHz
118.0416 MHz
118.0500 MHz
118.0500 MHz
118.0583 MHz
118.0666 MHz
118.0750 MHz
118.0750 MHz
118.0833 MHz
118.0916 MHz
118.1000 MHz
118.1000 MHz
118.1083 MHz
118.1166 MHz
118.1250 MHz
118.1250 MHz
118.1333 MHz
118.1416 MHz
25 kHz
8.33 kHz
8.33 kHz
8.33 kHz
25 kHz
8.33 kHz
8.33 kHz
8.33 kHz
25 kHz
8.33 kHz
8.33 kHz
8.33 kHz
25 kHz
8.33 kHz
8.33 kHz
8.33 kHz
25 kHz
8.33 kHz
8.33 kHz
8.33 kHz
25 kHz
8.33 kHz
8.33 kHz
8.33 kHz
118.000 MHz
118.005 MHz
118.010 MHz
118.015 MHz
118.025 MHz
118.030 MHz
118.035 MHz
118.040 MHz
118.050 MHz
118.055 MHz
118.060 MHz
118.065 MHz
118.075 MHz
118.080 MHz
118.085 MHz
118.090 MHz
118.100 MHz
118.105 MHz
118.110 MHz
118.115 MHz
118.125 MHz
118.130 MHz
118.135 MHz
118.140 MHz
T6T VHF 50 W Transmitter Page 10 Operation
Back to Transmitter
Main Page
Changing the Transmitter’s Operating Frequency
The transmitter’s frequency can be changed in two ways: either from the frequency screen, or by
recalling a preset channel. This procedure details using the Frequency screen.
Table 4 Relationship Between Line Level, VOGAD Threshold and Mute Threshold
Line Level Setting
(dBm) Average Speech
Level (dBm) Sine Wave Level
(dBm) VOGAD Threshold
(dBm) Mute Threshold
(dBm)
+10 +10 +20 0 -5
+5 +5 +15 -5 -10
00+10-10-15
-5 -5 +5 -15 -20
-10 -10 0 -20 -25
-15 -15 -5 -25 -30
-20 -20 -10 -30 -35
-25 -25 -15 -35 -40
-30 -30 -20 -40 -45
F r e q 1 1 8 . 0 0 0 M H z
C a n c e l O K
(1) From the Control screen, select
frequency to display the Frequency
screen.
(2) Turn the switch to highlight the digit to
be changed, then press the switch.
(3) Turn the switch until the required digit
is shown, then press the switch.
(4) Repeat until the required frequency is
shown, then highlight OK and press the
switch.
(5) Only frequencies that fall between the
band edge settings can be selected.
T6T VHF 50 W Transmitter Page 11 Operation
Back to Transmitter
Main Page
To Store and Recall Frequency Channels
Up to 100 frequency channels can be stored in the transmitter.
C h 1 0 0
F r e q 1 2 1 . 5 0 0 M H z
R e c a l l
B a c k E x i t
C h 1 0 0
F r e q 1 1 8 . 0 0 0 M H z
S t o r e
B a c k E x i t
C h 1 0 0
F r e q 1 1 8 . 0 0 0 M H z
I nn v a l i d f o r M o d e
B a c k E x i t
C h 1 0 0
F r e q 1 1 8 . 0 0 0 M H z
O u t s i d e B a n d E d g e
B a c k E x i t
To store a Channel Frequency
(1) From the Control screen, select
Channel to display the Channel
screen. Highlight Channel, press the
switch and then turn it until the required
channel number is displayed; press the
switch.
(2) Highlight the MHz frequency value
(see Example 2) press the switch and
then turn it until the required MHz value
is shown. Press the switch.
(3) Highlight the kHz frequency value (see
Example 3), press the switch and then
turn it until the required kHz value is
shown. Press the switch.
(4) Highlight Store and press the switch.
The new frequency is now stored in the
selected channel number.
To recall a Stored Frequency Channel
(1) From the Control screen, select
Channel to display the Channel
screen.
(2) To make the transmitter operate on
any preset channel frequency,
highlight Channel and press the switch.
Turn the switch until the required
channel number/frequency is
displayed, then press the switch.
(3) Turn the switch to highlight Recall, then
press the switch. Exit the screen. The
transmitter now operates on the
recalled channel frequency.
Notes:
If a frequency outside the band edge limits is
entered, a message (see Channel Screen -
Example 3) is displayed.
If a frequency not valid for the mode of
operation is entered, a message (see Channel
Screen - Example 4) is displayed.
Channel Screen - Example 1
Channel Screen - Example 2
Channel Screen - Example 3
Channel Screen - Example 4
T6T VHF 50 W Transmitter Page 12 Operation
Back to Transmitter
Main Page
To Initiate a BIT Test
Use the following procedure to initiate an interruptive BIT test from the transmitter's front panel. A BIT
test cannot be initiated while the transmitter is keyed. After a BIT test has been run, the BIT screen is
displayed (see AM-Voice and AM-MSK BIT Screen on page 24). An interruptive BIT test cannot be
initiated in Mode 2 or Mode 3.
(1) From the Main screen, press the switch to display the Control screen. Turn the switch until BIT
is highlighted. Press the switch.
(2) Ensure the BIT menu is displayed. Turn the switch until BIT Initiate is highlighted. Press the
switch.
(3) During the test, which takes approximately two seconds, the Testing screen is displayed.
B I T I n i t i a t e
E T I 0 0 0 0 0 : 0 0 h r s
A C S u p p l y O N
E x i t > >
T e s t i n g
P l e a s e W a i t
During an interruptive BIT test, the transmitter radiates modulated carrier waves at the set power.
Users should therefore obtain the necessary authority before initiating a test.
If the test is to be carried out with the antenna disconnected, ensure a load is fitted to the
transmitter's antenna connector.
In order to test the line input stages, an internally generated 1 kHz tone is injected into the line input
circuit. Any other audio present on the line input will cause the test to be inaccurate. Therefore the
transmitter must not be keyed during the test.
B I T
S / W C o n f i g
S t a n d b y
E x i t < <
T6T VHF 50 W Transmitter Page 13 Operation
Back to Transmitter
Main Page
(4) On completion, and if the interruptive test was initiated from the front panel, one of the following
screens will be shown.
(5) Selecting OK takes the user back to the BIT screen.
(6) Selecting OK takes the user back to the BIT screen. The user can then scroll through the screen
to check out transmitter parameters for failure.
Standby Mode
Standby mode is a power saving feature that can be used for non-operational transmitters. When in
standby mode, most of the transmitter's circuits are inactive, the LCD is blanked, and the transmitter
cannot be keyed. To put the transmitter into standby mode, use the following procedure.
When the transmitter is in Standby mode, the red front panel Standby indicator is lit.
To Enter Standby Mode
To Exit Standby Mode
T e s t S t a t u s
PASS
O K
T e s t S t a t u s
F A I L
O K
E n t e r S t a n d b y ?
Y e s N o
(1) From the Control screen select
Standby.
(2) At the Standby screen, select Yes.
(3) Check that the display blanks and
the front panel Standby indicator is
lit.
E x i t S t a n d b y ?
Y e s N o
(1) Press the Switch.
(2) Select Yes.
(3) Check that the Main screen is
displayed and that the front panel
Standby indicator is unlit.
T6T VHF 50 W Transmitter Page 14 Operation
Back to Transmitter
Main Page
Settings
Operational settings for the T6T VHF transmitter are configured at the front panel, through the VFP, and
through an associated MARC system (or compatible control system). Some settings can also be made
remotely via a T6 controller. The Settings screen is entered from the Control screen.
The settings that can be selected at the front panel Settings screen are:
❑Mode - either AM-Voice, AM-MSK, Mode 2 or Mode 3
❑Mode Settings - allows the selected mode parameters to be set
❑Polarities
❑Band edges
❑Backlight
❑Reference frequency.
Note that the mode selection, reference frequency and backlight are set from this screen. When mode
settings, polarities and band edges are selected the user is taken to other screens.
General and mode specific settings, showing default values, are referenced in Table 5 on page 15. Click
on any required parameter by page number for further references.
M o d e A M V o i c e
M o d e S e t t i n g s
P o l a r i t i e s
E x i t > >
Band Edges
R e f F r e q 5 0 . 0 %
B a c k l i g h t 0 3 0 s
E x i t < < > >
B a c k
E x i t
Select between AM-Voice, AM-MSK, Mode 2 or Mode 3.
Select to take you to the mode specific Settings menu.
Select to take you to the Polarities menu.
Set the transmitter’s frequency band edges.
Align the transmitter’s reference frequency (Note 1).
Adjust the LCD’s backlight time out (Note 2).
Notes:
1.Setting the transmitter’s reference frequency is a maintenance operation. The current value should
not be reset unless the correct test equipment is connected. See the Maintenance section.
2.The LCD’s backlight can be set for permanently on, off, or timed to stay on for a period between
15 and 120 seconds.
T6T VHF 50 W Transmitter Page 15 Operation
Back to Transmitter
Main Page
Table 5 Operational Settings from the Front Panel
Parameter Mode Adjustment Range Factory Default Setting Further
Reference
Menu lock screen All Locked or unlocked Unlocked page 8
Enter standby
mode
All Yes or No - page 13
Exit standby mode All Yes or No - page 13
Set mode of
operation
All AM-voice, AM-MSK, Mode
2 or Mode 3
AM-voice page 14
Set polarities AM-voice,
AM-MSK
STD or INV STD page 20
Band edges All 118.000 to 136.975 MHz
or
112.000 to 155.975 MHz
118.000 and 136.975 MHz
or
112.000 and 155.975 MHz
page 28
LCD Backlight All 15 to 120 s, On or Off 30 s page 14
RF power All 5 to 50 W 50 W page 16
Audio line in level AM-voice,
AM-MSK -30 to +10 dBm -13 dBm page 16 and
page 18
Inhibit AM-voice,
AM-MSK
On or Off Off page 16 and
page 18
PTT (key) AM-voice,
AM-MSK On (key), Off (de-key) Off page 16 and
page 18
Tx time out AM-voice,
AM-MSK
2 to 510 s or Off 180 s page 16 and
page 18
Modulation depth AM-voice,
AM-MSK 5 to 95% 85% page 16 and
page 18
Mute AM-voice On or Off On page 16
VOGAD AM-voice On or Off On page 16
Antenna C/O delay AM-voice
AM-MSK
On or Off On
Off
page 16
page 18
Offset AM-voice 0, ±2.5, ±5, ±7.3, ±7.5 kHz
(additionally, ±4 and
±8 kHz on HS models)
0 (No offset) page 17
Step AM-voice 8.33 kHz, 25 kHz or both 25 kHz page 17
Mic AM-voice Active or Passive Passive page 17
Key priority AM-voice,
AM-MSK
Local-Remote or
Remote-Local
Local-Remote page 17 and
page 18
Local PTT AM-voice,
AM-MSK
Enabled or Disabled Enabled page 17 and
page 18
Remote PTT AM-voice,
AM-MSK
Enabled or Disabled Enabled page 17 and
page 18
Remote phantom
PTT
AM-voice,
AM-MSK
Enabled or Disabled Enabled page 17 and
page 18
T6T VHF 50 W Transmitter Page 16 Operation
Back to Transmitter
Main Page
AM Voice Settings Procedure
During this procedure, the following parameters, applicable to AM-voice operation, can be set:
❑RF power output
❑Audio line input level
❑Inhibit
❑PTT on (key) or off (de-key)
❑Transmitter time out
❑Modulation depth
❑Mute (on or off)
❑VOGAD (on or off)
❑Antenna c/o delay (on or off)
❑Offset
❑Step
❑Mic
❑Key priority (local or remote)
❑Enable or disable local PTT
❑Enable or disable remote PTT
❑Enable or disable remote phantom PTT.
AM Voice Mode Settings Screen
The AM-voice mode setting screen is accessed from the Settings screen. Use the Scroll/Select switch to
select the parameter, then enter the required setting(s).
P o w e r 5 0 W
L i n e I n - 1 3 d B m
I n h i b i t O F F
E x i t > >
P T T O F F
T X T i m e o u t 1 8 0 s
M o d D e p t h 8 5 %
E x i t < < > >
M u t e O N
V O G A D O N
A n t C / O D e l O N
E x i t < < > >
Adjustments
RF power between 5 W to 50 W.
Audio line in level between -30 to +10 dBm.
On or Off.
On (key), Off (de-key).
2 to 510 s.
5 to 95%.
On or Off.
On or Off.
On or Off.
T6T VHF 50 W Transmitter Page 17 Operation
Back to Transmitter
Main Page
O f f s e t 0 . 0 k H z
S t e p 2 5 k H z
M i c P A S S I V E
E x i t < < > >
K e y P r i o r i t y L - R
L o c a l P T T E N
R e m o t e P T T E N
E x i t < < > >
R e m P h a n P T T E N
B a c k
E x i t < <
Adjustments
0, ±2.5, ±5, ±7.3, ±7.5, (or ±4, ±8 HS only) kHz.
25 kHz, 8.33 kHz or both.
Active or Passive.
Local-remote or Remote-local.
Enabled or Disabled.
Enabled or Disabled.
Enabled or Disabled.
Return to screen.
T6T VHF 50 W Transmitter Page 18 Operation
Back to Transmitter
Main Page
AM-MSK Mode Settings Procedure
During this procedure, the following parameters, applicable to AM MSK operation, can be set:
❑RF power output
❑Audio line input level
❑Inhibit
❑PTT on (key) or off (de-key)
❑Transmitter time out
❑Modulation depth
❑Antenna c/o delay (on or off)
❑Key priority (local or remote)
❑Enable or disable remote PTT
❑Enable or disable remote phantom PTT.
AM-MSK Mode Settings Screens
The AM-MSK mode setting screen is accessed from the Settings screen. Use the Scroll/Select switch to
select the parameter, then enter the required setting(s).
P o w e r 5 0 W
L i n e I n - 1 3 d B m
I n h i b i t O F F
E x i t > >
P T T O F F
T X T i m e o u t 1 8 0 s
M o d D e p t h 8 5 %
E x i t < < > >
A n t C / O D e l O N
K e y P r i o r i t y L - R
L o c a l P T T E N
E x i t < < > >
R e m o t e P T T E N
R e m P h a n P T T E N
B a c k
E x i t < <
Adjustments
RF power between 5 W to 50 W.
Audio line in level between -30 to +10 dBm.
On or Off.
On (key), Off (de-key).
2 to 510 s.
5 to 95%.
On or Off.
Local-remote or Remote-local.
Enabled or Disabled.
Enabled or Disabled.
Enabled or Disabled.
T6T VHF 50 W Transmitter Page 19 Operation
Back to Transmitter
Main Page
Mode 2 Settings Screen
This is an advisory screen. Pressing OK returns the user to the Main screen.
Mode 3 Settings Screen
This is an advisory screen. Pressing OK returns the user to the Main screen.
M o d e 2 p a r a m e t e r s
a r e s e t v i a t h e
H L D C i n t e r f a c e
O K
M o d e 3 p a r a m e t e r s
a r e s e t v i a t h e
T 1 / E 1 i n t e r f a c e
O K
T6T VHF 50 W Transmitter Page 20 Operation
Back to Transmitter
Main Page
Polarities Screens AM-Voice and AM-MSK
A number of remote indication and control signals can be hard-wire connected to the transmitter. These
signals include a transmitter ready indication, a PTT control signal, a phantom PTT control signal, a PTT
out indication, a transmitter inhibit control signal, a BIT test initiation control signal, an external VSWR
fault indication and antenna C/O. The following paragraphs detail the signals applicable to the
operational mode of the transmitter.
The Polarities screen is accessed from the Settings screen.
AM-Voice and AM-MSK Polarity Settings
R e a d y O u t S T D
E - B I T I n S T D
I n h i b i t I n S T D
E x i t > >
B I T S t a r t I n S T D
P T T R e f + 1 4 V
P T T I n S T D
E x i t > >
P h a n P T T I n S T D
P T T O u t S T D
F a s t P T T O u t S T D
E x i t < < > >
E x t V S W R I n S T D
A n t C / O O u t S T D
B a c k
E x i t < <
Each of ten polarity settings applicable to
AM-voice and AM-MSK can be set to the default
STD (standard) setting or INV (inverted).
The signal connections are shown in Table 6 on
page 21 along with the conditions when STD or
INV is selected.
The settings for the PTT Reference voltage are
also shown in Table 6.
T6T VHF 50 W Transmitter Page 21 Operation
Back to Transmitter
Main Page
Table 6 AM-Voice and AM-MSK Polarity Settings
Signal Connector Polarity set to STD Polarity set to INV
Ready Out Facilities, pin 13 An open collector grounded
output when the radio is ready
to transmit and no BIT faults
are detected.
An open collector high
impedance output when the
radio is ready to transmit and
no BIT faults are detected.
E-BIT In Facilities, pin 2 TTL input. 0 V indicates an
external fault.
TTL input. 5 V indicates an
external fault.
Inhibit In Facilities, pin 10 TTL input. 0 V inhibits
transmitter operation.
TTL input. 5 V inhibits
transmitter operation.
BIT Start In Facilities, pin 11 TTL input. 0 V initiates an
interruptive BIT test.
TTL input. 5 V initiates an
interruptive BIT test.
PTT In MARC, pin 4
MARC Audio, pin 6
Active when input differs from
reference by more than ±10 V.
Inactive when input differs from
reference by less than ±1 V.
Maximum input level ±60 V
with respect to reference. Input
will draw no more than 6 mA,
requires at least 1 mA to
operate.
Active when input differs from
reference by less than ±1 V.
Inactive when input differs from
reference by more than +10 V.
Maximum input level +60 V
with respect to reference. Input
will draw no more than 6 mA,
requires at least 1 mA to
operate.
Phantom PTT In MARC or
MARC Audio, pin 2
Active when input differs from
reference by more than ±10 V.
Inactive when input differs from
reference by less than ±1 V.
Maximum input level ±60 V
with respect to reference. Input
will draw no more than 6 mA,
requires at least 1 mA to
operate.
Active when input differs from
reference by less than ±1 V.
Inactive when input differs from
reference by more than +10 V.
Maximum input level +60 V
with respect to reference. Input
will draw no more than 6 mA,
requires at least 1 mA to
operate.
PTT Out Facilities, pin 3 Grounding solid state relay.
+60 to -60 V, ac or dc, 100 mA
max, n/o. Activated 20 ms
(±1 ms) before the start of the
power ramp up to allow for the
antenna relay to pull-in time.
Grounding solid state relay.
+60 to -60 V, ac or dc, 100 mA
max, n/c. Activated 20 ms
(±1 ms) before the start of the
power ramp up to allow for the
antenna relay to pull-in time
External VSWR
Input
Facilities, pin 4 TTL input. 0 V active. TTL input. 5 V active.
Antenna
Changeover
Facilities, pin 5
(Common pin 6)
Solid state relay. +60 to -60V,
ac or dc, 100 mA max, n/o.
Activated 35 ms (±1 ms) before
the start of the power ramp up
to allow for the antenna relay
pull-in time.
Common 0 V.
Solid state relay. +60 to -60V,
ac or dc, 100 mA max, n/c.
Activated 35 ms (±1 ms) before
the start of the power ramp up
to allow for the antenna relay
pull-in time.
Common 0 V.
Continued >>
T6T VHF 50 W Transmitter Page 22 Operation
Back to Transmitter
Main Page
Fast PTT Output
(antenna
changeover)
MARC Audio, pin 3 Open collector NPN transistor
grounding output, 200 mA max,
n/o).
Open collector NPN transistor
grounding output, 200 mA max,
n/c.
PTT Ref
.
-PTT Ref can be set to +14 V,
0 V or -14 V. PTT state is:
+14 V Ref. key ≤+4 V
≥+24 V
unkey +13 to
+15 V
0 V Ref. key ≤-10 V
≥+10 V
unkey -1 V to +1 V
-14 V Ref. key ≤-24 V
≥-4 V
unkey -13 to -15 V
Maximum input level ±60 V
with respect to reference. Input
will draw no more than 6 mA,
and requires at least 1 mA to
operate.
PTT Ref can be set to +14 V,
0 V or -14 V. PTT state is:
+14 V Ref. unkey ≤+4 V
≥+24 V
key +13
to +15 V
0 V Ref. unkey ≤-10 V
≥+10 V
key -1 V to +1 V
-14 V Ref. unkey ≤-24 V
≥-4 V
key -13 to -15 V
Maximum input level ±60 V
with respect to reference. Input
will draw no more than 6 mA,
and requires at least 1 mA to
operate.
Table 6 AM-Voice and AM-MSK Polarity Settings (Continued)
Signal Connector Polarity set to STD Polarity set to INV
T6T VHF 50 W Transmitter Page 23 Operation
Back to Transmitter
Main Page
Mode 2 and Mode 3 Polarity Settings
Table 7 Mode 2 and Mode 3 Polarity Settings
Signal Connector Polarity set to STD Polarity set to INV
Ready Out Facilities, pin 13 An open collector grounded
output when the radio is ready
to transmit and no BIT faults
are detected.
An open collector high
impedance output when the radio
is ready to transmit and no BIT
faults are detected.
E-BIT In Facilities, pin 2 TTL input. 0 V indicates an
external fault. TTL input. 5 V indicates an
external fault.
External VSWR
Input
Facilities, pin 4 TTL input. 0 V active. TTL input. 5 V active.
R e a d y O u t S T D
E - B I T I n S T D
E x t V S W R I n S T D
E x i t > >
B a c k
E x i t
< <
Each of the three polarity settings applicable to
Mode 2 and Mode 3 can be set to the default STD
(standard) setting or INV (inverted).
The signal connections are shown in Table 7
along with the conditions when STD or INV is
selected.
T6T VHF 50 W Transmitter Page 24 Operation
Back to Transmitter
Main Page
AM-Voice and AM-MSK BIT Screen
The AM-voice and AM-MSK BIT screen is accessed from the Control screen.
B I T I n i t i a t e
E T I 0 0 0 0 0 : 0 0 h r s
A C S u p p l y O N
E x i t > >
D C S u p p l y O N
S u p p l y 2 8 V
S y n t h L o c k P A S S
E x i t < < > >
P A T e m p 5 0 d e g C
P A C o o l i n g P A S S
B a s e b a n d P A S S
E x i t < < > >
R F D r i v e P A S S
P A O u t p u t P A S S
P A L o o p P A S S
E x i t < < > >
M o d D e p t h P A S S
R F F i l t e r s P A S S
V S W R P A S S
E x i t < < > >
L o o p E r r o r P A S S
A u d i o I n P A S S
D S P 1 P A S S
E x i t < < > >
Select to initiate BIT test.
Shows elapsed time 0:00 to 99999:59 (Hrs:Min).
Shows state of ac supply (On or Off).
PA temperature -20°C to +150°C.
Pass or Fail.
Pass, Fail or Not Tested.
Pass, Fail or Not Tested.
Pass, Fail or Not Tested.
Pass, Fail or Not Tested.
Shows state of dc supply (On or Off).
dc supply 0 to 40 V, <21.6 V Alert, <19 V Alarm.
Pass or Fail (Out-of-Lock).
Pass, Fail or Not Tested.
Pass, Fail or Not Tested.
Pass, Fail or Not Tested.
Pass or Fail.
Pass, Fail or Not Tested.
Pass or Fail.
T6T VHF 50 W Transmitter Page 25 Operation
Back to Transmitter
Main Page
DSP2 PASS
X i l i n x 1 P A S S
X i l i n x 2 P A S S
E x i t < < > >
E E P R O M P A S S
S t a r t U p P A S S
C a l i b r a t i o n P A S S
E x i t < < > >
U n k e y e d P w r P A S S
E - B I T P A S S
M A R C A C T I V E
E x i t < < > >
H D L C I N A C T I V E
T 1 / E 1 I N A C T I V E
B a c k
E x i t < <
Pass or Fail.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Active or Inactive.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Active or Inactive.
Active or Inactive.
T6T VHF 50 W Transmitter Page 26 Operation
Back to Transmitter
Main Page
Mode 2 and Mode 3 BIT Screen
The Mode 2 and Mode 3 BIT screen is accessed from the Control screen.
E T I 0 0 0 0 0 : 0 0 h r s
A C S u p p l y O N
D C S u p p l y O N
E x i t > >
S u p p l y 2 8 V
S y n t h L o c k P A S S
P A T e m p 5 0 d e g C
E x i t < < > >
P A C o o l i n g P A S S
VSWR PASS
L o o p E r r o r P A S S
E x i t < < > >
D S P 1 P A S S
D S P 2 P A S S
X i l i n x 1 P A S S
E x i t < < > >
X i l i n x 2 P A S S
E E P R O M P A S S
S t a r t U p P A S S
E x i t < < > >
C a l i b r a t i o n P A S S
E - B I T P A S S
M A R C A C T I V E
E x i t < < > >
Shows elapsed time 0:00 to 99999:59 (Hrs:Min).
Shows state of ac supply (On or Off).
Shows state of dc supply (On or Off).
Shows value of dc supply.
Synth lock (Pass or Fail).
Indicates the PA temperature.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Pass, Fail or Not Tested.
Pass or Fail.
Pass or Fail.
Pass or Fail.
Active or Inactive.
H D L C I N A C T I V E
T 1 / E 1 I N A C T I V E
B a c k
E x i t < <
Active or Inactive.
Active or Inactive.
T6T VHF 50 W Transmitter Page 27 Operation
Back to Transmitter
Main Page
Software Configuration Screens
Software configuration screens are as follows:
T 6 V H F 5 0 W T X
1 1 8 - 1 3 6 . 9 7 5 M H z
H i g h S t a b i l i t y
E x i t > >
B o o t S o f t w a r e
65- xxxxxxxx/ vv
E x i t < < > >
B a s e S o f t w a r e
65- xxxxxxxx/ vv
E x i t < < > >
M o d e S o f t w a r e
65- xxxxxxxx/ vv
E x i t < < > >
F i l l 1 S o f t w a r e
65- xxxxxxxx/ vv
[ D e s c r i p t i o n ]
E x i t < < > >
F i l l 2 S o f t w a r e
65- xxxxxxxx/ vv
[ D e s c r i p t i o n ]
E x i t < < > >
Second line variation for WB radios reads
112-155.975 MHz.
Third line variation for WB radios is blank.
65-xxxxxxxx represents the software part
number and /v v represents its version.
65-xxxxxxxx represents the software part
number and /v v represents its version.
Current mode running. 65-xxxxxxxx
represents the software part number and /v v
represents its version.
65-xxxxxxxx represents the software part
number and /v v represents its version.
65-xxxxxxxx represents the software part
number and /v v represents its version.
T6T VHF 50 W Transmitter Page 28 Operation
Back to Transmitter
Main Page
Band Edges
The frequency range of the transmitter is 118 to 136.975 MHz for the B6350/NB version, or 112 to
155.975 MHz for the B6350/WB version.
If required, transmission can be limited to either one or two smaller parts of the frequency band by setting
the band edges BE1 to BE4. Transmission is possible between BE1 and BE2 frequencies, and
frequencies between BE3 and BE4.
Table 8 Band Edge Values
BE1 BE2 BE3 BE4
B6350/NB set so that operation is over the full frequency
range.
118.000 136.975 118.000 136.975
B6350/WB set so that operation is over the full frequency
range.
112.000 155.975 112.000 155.975
Example: Transmitter set to transmit only those frequencies
in the range 120 to 130 MHz.
120.000 130.000 120.000 130.000
Example: Transmitter set to transmit only those frequencies
in the ranges 120 to 125 MHz and 130 to 135 MHz.
120.000 125.000 130.000 135.000
F i l l 3 S o f t w a r e
6 5 - x x x x x x x x / v v
[ D e s c r i p t i o n ]
F i l l 4 S o f t w a r e
6 5 - x x x x x x x x / v v
[ D e s c r i p t i o n ]
65-xxxxxxxx represents the software part number
and /v v represents its version.
65-xxxxxxxx represents the software part number
and /v v represents its version.
B E 1 1 1 8 . 0 0 0 M H z
B E 2 1 3 6 . 9 7 5 M H z
B E 3 1 1 8 . 0 0 0 M H z
E x i t > >
B E 4 1 3 6 . 9 7 5 M H z
E x i t < <
The Band Edge screen is accessed from the
Control screen.
Band edge frequencies can be set only in
increments of 25 kHz.
If the transmitter is required to operate over the
full range, the band edge parameters must be set
to the lowest and highest values in the range (see
Table 8).
T6T VHF 50 W Transmitter Page 29 Operation
Back to Transmitter
Main Page
BIT Status Warning Screens
The following shows some example BIT screens. These screens alternate with the Main screen when an
alert or alarm condition is present. Only the parameters causing the alert or alarm are displayed, and if
both an alert and alarm condition exists simultaneously only the alarm information is displayed. If multiple
parameters are signalling an alert or alarm condition, multiple screens are used to display the status
alternating with the Main screen.
A L E R T
S u p p l y 2 1 V
A L E R T
R F P o w e r R e d u c e d
L o o p E r r o r
S u p p l y 2 1 V
A L E R T
R F P o w e r R e d u c e d
P A T e m p 8 5 d e g C
A L A R M
R F P o w e r R e d u c e d
V S W R F A I L
A L A R M
R F P o w e r R e m o v e d
L o o p E r r o r F A I L
S u p p l y 1 8 V
A L A R M
R F P o w e r R e m o v e d
P A T e m p 9 5 d e g C
No RF power reduction
Alarm indicator flashing
RF power reduced between 1 and 3 dB
Alarm indicator flashing
RF power reduced between 1 and 3 dB
Alarm indicator flashing
RF power reduced by more than 3 dB
Alarm indicator on
RF power shut down
Alarm indicator on
RF power shut down
Alarm indicator on
T6T VHF 50 W Transmitter Page 30 Operation
Back to Transmitter
Main Page
Table 9 Functions and Parameters
Function Front
Panel VFP MARC T6
Controller T1/E1 HDLC Default Setting
FREQUENCY
Change frequency ✔✔✔ ✔ ✔✔ 118.000 MHz
FREQUENCY CHANNELS
Store/Recall preset
frequency channels ✔✔✔ ✔ ✗✗ -
SETTINGS
Set modulation
mode ✔✔✔ ✔ ✔✔ AM-Voice
Radio Settings (AM Modes):
Set RF output
power ✔✔✔ ✔ ✔✔ 50 W
Set audio input line
level ✔✔✔ ✗ ✔✗ -13 dBm
Set inhibit on or off ✔✔✔ ✗ ✗✗ Off
PTT test facility
on (key), off (de-
key)
✔✔
View
state ✗✔✗ Off
Set Tx time out ✔✔✔ ✗ ✔✗ 180 s
Set modulation
depth ✔✔✔ ✔ ✔✗ 85%
Set mute on or off
(AM-Voice only) ✔✔✔ ✗ ✗✗ On
Set VOGAD on
or off
(AM-Voice only)
✔✔✔ ✗ ✗✗ On
Set antenna C/O
delay on or off ✔✔✔ ✗ ✗✗ AM-Voice - On
AM-MSK - Off
Set frequency offset
(AM-Voice only) ✔✔✔ ✗ ✗✗ 0 (No offset)
Set frequency step
size
(AM-Voice only)
✔✔✗ ✗ ✗✗ 25 kHz
Continued >>
T6T VHF 50 W Transmitter Page 31 Operation
Back to Transmitter
Main Page
Set microphone
type
(active or passive)
(AM-Voice only)
✔✔✗ ✗ ✗✗ Passive
Set keying priority
(local or remote) ✔✔✗ ✗ ✗✗ Local-Remote
Enable or disable
local PTT ✔✔✗ ✗ ✗✗ Enabled
Enable or disable
remote PTT ✔✔✗ ✗ ✗✗ Enabled
Enable or disable
remote phantom
PTT
✔✔✗ ✗ ✗✗ Enabled
Radio Settings (Digital Modes):
MAC TM1 (inter
access delay) ✗✔✗ ✗ ✗✔ 2.5 ms
MAC TM2 (channel
busy) ✗✔✗ ✗ ✗✔ 60 s
MAC p
(persistance) ✗✔✗ ✗ ✗✔ 13/256
MAC M1 (maximum
number of access
attempts)
✗✔✗ ✗ ✗✔
135
Scramble vector ✗✔✗ ✗ ✗✔ 4D4B
19787
Tx enable ✗✔✗ ✗ ✗✔ On
Polarities:
Ready out ✔✔
View
state ✗✗✗ STD
Set PTT input
polarity
(AM modes only)
✔✔
View
state ✗✗✗ STD
Set phantom PTT
input polarity
(AM modes only)
✔✔
View
state ✗✗✗ STD
Continued >>
Table 9 Functions and Parameters (Continued)
Function Front
Panel VFP MARC T6
Controller T1/E1 HDLC Default Setting
T6T VHF 50 W Transmitter Page 32 Operation
Back to Transmitter
Main Page
Set PTT reference
voltage
(AM modes only)
✔✔
View
state ✗✗✗ +14 V
Set PTT output
polarity
(AM modes only)
✔✔
View
state ✗✗✗ STD
Set fast PTT
antenna
changeover output
polarity
(AM modes only)
✔✔
View
state ✗✗✗ STD
Set antenna
changeover output
polarity
(AM modes only)
✔✔
View
state ✗✗✗ STD
Set external VSWR
input polarity
(All modes)
✔✔
View
state ✗✗✗ STD
Set inhibit input
polarity
(AM modes only)
✔✔
View
state ✗✗✗ STD
BIT interruptive test
input polarity
(AM modes only)
✔✔
View
state ✗✗✗ STD (active low)
E-bit input polarity
(All modes) ✔✔
View
state ✗✗✗ STD (active low)
Band Edges:
Set band edges ✔✔✗ ✗ ✗✗
118.000 and 136.975 MHz
or
112.000 and 155.975 MHz
Reference Frequency:
Adjust transmitter’s
reference frequency ✔✔ ✗ ✗ ✗✗ -
LCD Backlight:
Adjust LCD
backlight ✔✔✗ ✗ ✗✗ 30 s
Continued >>
Table 9 Functions and Parameters (Continued)
Function Front
Panel VFP MARC T6
Controller T1/E1 HDLC Default Setting
T6T VHF 50 W Transmitter Page 33 Operation
Back to Transmitter
Main Page
End of Document
BIT
Initiate BIT
interruptive test ✔✔✔ ✔ ✗✗ -
STANDBY
Enter and exit
standby facility ✔✔✔ ✔ ✗✗ Not in Standby
SOFTWARE CONFIGURATION
View the
transmitter’s
software
configuration
✔✔✗ ✗ ✔✔ -
LOCK FACILITIES
Front panel lock ✗✔✗ ✗ ✗✗ Off
MARC lock ✗✔✗ ✗ ✗✗ Off
T1/E1 lock ✗✔✗ ✗ ✗✗ Off
HDLC lock ✗✔✗ ✗ ✗✗ Off
Table 9 Functions and Parameters (Continued)
Function Front
Panel VFP MARC T6
Controller T1/E1 HDLC Default Setting
Back to Transmitter
Main Page
Installation
T6T VHF 50 W Transmitter Page 2 Installation
Back to Transmitter
Main Page
Warnings and Cautions
The instructions given in this section involve connecting dangerous voltages to the
transmitter. The instructions detailed in this document must be carried out only by suitably
qualified personnel.
The equipment is permanently connected to the mains supply when the mains connector is
attached. Switching the rear panel Power switch to off does not isolate all internal circuits
from the mains supply. For this reason, a mains isolating switch should be fitted close to,
and easily accessible from, the transmitter's position. The isolation switch should isolate
both live and neutral supplies, be clearly labelled, and adequately rated to protect the
equipment.
The antenna used with the transmitter must be installed such that the resultant radiated field
strength is below 10 W/m² in areas normally accessible to personnel.
The T6T transmitter's circuitry contains Electrostatic Sensitive Devices (ESSDs). Personnel
must be aware of the precautions necessary to prevent damage to such devices. During
installation all precautions necessary to prevent ESSD damage must be taken.
Changes or modifications made to this equipment that are not expressly approved by
Park Air, or parties authorized by Park Air, could void the user’s authority to operate the
equipment.
WARNING Dangerous Voltages
WARNING Dangerous Voltages
WARNING Antenna Radiation
Caution ESSDs
Caution Unauthorized Modifications
T6T VHF 50 W Transmitter Page 3 Installation
Back to Transmitter
Main Page
Introduction
The procedures necessary to install a transmitter are listed in Table 1.
Fuses and Connectors
The following list details the radio’s supply fuses and connectors. Some of the connectors (depending on
your particular configuration) are required during installation.
Table 1 Installation Procedures
Procedure Reference
1 Read and understand the warnings and cautions given on page 2.
2 Perform an initial inspection of the transmitter and fit the correct ac input fuse. page 9
3 Fit the transmitter into an equipment cabinet. page 9
4 Make external signal connections. See Fig 1 to Fig 5 to determine which
external connections are required for the particular configuration.
page 10
5 Connect the chassis stud to the cabinet or system earth. page 22
6 Connect the antenna. page 22
7 Connect the dc input supply (if required). page 22
8 Connect the ac input supply (if required). page 23
Table 2 Fuses and Connectors
Component Type Park Air Part Number
Fuses:
AC input fuse, F2, for 110/120 V input
AC input fuse, F2, for 220/230 V input
T4A, 125V, UL
T4A, 250V, IEC
29C11120102S
29E01120108S
DC input fuse 15A size 0 29-01350201
Connectors:
AC supply connector IEC 20-02030102
DC supply connector XLR3 socket 20-01030106
Antenna connector N-type plug 19-01030301
MARC connector 9-way D-type plug Plug: 20-01090100
Cover: 20-09090101
MARC audio RJ48 plug 20K01080100
MARC data RJ48 plug 20K01080100
Facilities connector 15-way D-type plug Plug: 20-01150100
Cover: 20-09150101
HDLC connector RJ48 plug 20K01080100
T1/E1 connector RJ48 plug 20K01080100
Reference connector SMB connector 19C01050300
Microphone/Diagnostics connector 7-pin DIN plug 20-01070101
T6T VHF 50 W Transmitter Page 4 Installation
Back to Transmitter
Main Page
Configuration
Connection of external equipment depends on the configuration required. Possible configurations are:
❑T6T transmitter configured for local operation (see Fig 1).
❑T6T transmitter configured for remote operation (see Fig 2).
❑T6T transmitter configured for use with MARC (see Fig 3).
❑T6T Mode 2 configuration (see Fig 4).
❑T6T Mode 3 configuration. (see Fig 5).
Fig 1 T6T Transmitter Configured for Local Operation
For local operation, the transmitter is operated from the front panel using a microphone/headset.
Any of the optional facilities may be connected.
Antenna
Connector
Reference
Connector Microphone/Diagnostics
Connector
Frequency Counter
required only for
maintenance
Facilities
Connector
T6T Transmitter
E-BIT input
PTT relay output
External VSWR input
Unregulated supply output
Inhibit input
BIT interruptive test input
Antenna changeover output
Ready output
Tape output
Optional Facilities that
can be used if required
Laptop (or PC) required
only for maintenance
Mic/Headset for
local operation
T6T VHF 50 W Transmitter Page 5 Installation
Back to Transmitter
Main Page
Fig 2 T6T Transmitter Configured for Remote Operation
Antenna
Connector
Microphone/Diagnostics
Connector
MARC Connector
or,
MARC Data and MARC Audio
Connectors
Mic/Headset for
engineering use
Laptop (or PC) required
only for maintenance
T6T Transmitter
Audio
RS422 Data
PTT
Unregulated supply
Optional Facilities that
can be used if required
E-BIT input
PTT relay output
External VSWR input
Unregulated supply output
Inhibit input
BIT interruptive test input
Antenna changeover output
Ready output
Tape output
Reference
Connector
Frequency Counter
required only for
maintenance
Facilities
Connector
For remote operation, Audio and PTT signals from the control equipment terminate on the MARC
connector, or alternatively on the MARC Audio connector. If data is required by a compatible data system,
the RS422 data lines terminate on the MARC connector, or alternatively on the MARC Data connector.
Any of the optional facilities may be connected.
T6T VHF 50 W Transmitter Page 6 Installation
Back to Transmitter
Main Page
Fig 3 T6T Transmitter Configured for use with MARC
Antenna
Connector
Reference
Connector Microphone/Diagnostics
Connector
T6T Transmitter
Equipment
Connector
RSE2
MARC
Connector
Audio
PTT
RS422 data
Unregulated supply
E-BIT input
PTT relay output
External VSWR input
Unregulated supply output
Inhibit input
BIT interruptive test input
Antenna changeover output
Ready output
Tape output
Facilities
Connector
Frequency Counter
required only for
maintenance
Mic/Headset for
engineering use
Laptop (or PC) required
only for maintenance
Optional Facilities that
can be used if required
When using a T6T transmitter with a MARC Remote Site Equipment (RSE2) the transmitter MARC
connector is pin-to-pin wired to one of the RSE2 Equipment connectors.
Any of the optional facilities may be connected.
T6T VHF 50 W Transmitter Page 7 Installation
Back to Transmitter
Main Page
Fig 4 T6T Transmitter Mode 2 Configuration
Antenna
Connector
T6R Receiver
Antenna
Connector
T6T Transmitter
HDLC
Connector T1/E1
Connector Facilities
Connector
Reference
Connector
Microphone/Diagnostics
Connector
Reference
Connector
Headset/Diagnostics
Connector
T1/E1
Connector
Fast Antenna
Change-Over
Switch
Antenna c/o control
Mode 2
Network Computer
Laptop (or PC) required
only for maintenance
Connects to the
Microphone/Diagnostics
connector
Frequency Counter
required only for
maintenance
Connects to the
Reference connector
Control and data
Control and
data. 2 km
maximum
distance
T6T VHF 50 W Transmitter Page 8 Installation
Back to Transmitter
Main Page
Fig 5 T6T Transmitter Mode 3 Configuration
Antenna
Connector
T6T Transmitter
T1/E1
Connector Reference
Connector Microphone/Diagnostics
Connector
Mode 3
Network Computer Control and data
Frequency Counter
required only for
maintenance
Laptop (or PC) required
only for maintenance
T6T VHF 50 W Transmitter Page 9 Installation
Back to Transmitter
Main Page
Installation Procedures
Initial Inspection of the Transmitter
On receipt of the transmitter, remove all transit packaging and check that there is no damage. If damage
is evident, contact Park Air immediately and retain the original transit packaging. One copy of the T6 User
Guide CD (part number 31-36T62VCD) is normally supplied with the transmitter. This CD includes the
VFP software.
Fitting the Correct AC Input Fuse
The mains input fuse F2 is an integral part of the rear panel ac connector. The fuse type must be correct
for the local mains supply as detailed below.
Fitting a Radio into an Equipment Cabinet
It is essential that the chosen mechanical installation provides adequate support along the
depth (front to rear) of the unit. The transmitter must not be supported by the front panel;
doing so can cause damage.
The transmitter can be installed on telescopic slides, or on fixed runners, within a standard 483 mm
(19 inch) equipment cabinet. M4 tapped holes, each 10 mm deep (see Fig 6) are provided on each side
of the equipment to accept the slides. Details of suitable telescopic slides and fixed runners are available
from Park Air.
When fitted in the cabinet, the transmitter's front panel must be secured to the cabinet’s chassis using
four M6 x 16 mm screws and plastic washers.
FS2
Spare Fuse
Line
Neutral
Earth
For a mains input in the range 110 to 120 Vac, fuse
F2 should be rated T4A, 125V, UL.
For a mains input in the range 110 to 240 Vac, fuse
F2 should be rated T4A, 250V, IEC.
Holder for spare
fuse (not supplied)
Caution Mechanical Support
T6T VHF 50 W Transmitter Page 10 Installation
Back to Transmitter
Main Page
Fig 6 Slide Fittings
Make External Signal Connections
Making the external signal connections involves configuring the transmitter to suit its operational mode.
Illustrations showing various configurations are shown in Fig 1 to Fig 5; these figures should be used only
as a guide.
Front Panel Connectors
The front panel has two connectors; Microphone/Diagnostics and Reference connectors. These are
illustrated in Fig 7.
Fig 7 Front Panel
Front
Panel
399
390.9
378.2
232.2
207.5
152.8
47.0
29.0
41.7
430
88.9
450
All measurements in mm
T6T VHF 50 W Transmitter Page 11 Installation
Back to Transmitter
Main Page
Microphone/Diagnostics Connector
The Microphone/Diagnostics connector is a self-locking 7-way DIN socket used for connecting a
microphone, microphone/headset or PC. The connector pin-out is detailed in Table 3.
Reference Connector
The Reference connector is an SMB plug used to monitor the radio’s reference frequency. It monitors
the frequency at a level of 100 mV (±50 mV) with less than -10 dBc harmonics.
Table 3 Microphone/Diagnostics Connector
Pin Number Signal Characteristic Usage
1 Microphone ground 0 V Microphone/Headset
2 Transmit data RS232. 115200 baud, 8 data bits, 1 stop bit,
no parity, no handshaking.
PC
3 Microphone PTT 0 V to PTT. Microphone/Headset
4 Receive data RS232. 115200 baud, 8 data bits, 1 stop bit,
no parity, no handshaking.
PC
5 Sidetone – Microphone/Headset
6 Microphone input To ensure correct VOGAD operation, the fol-
lowing microphone input levels are required:
Passive setting: between 2 and 35 mV
Active setting: between 8 and 140 mV.
Microphone/Headset
7 Ground 0 V PC
Pin-out of the Microphone/Diagnostics connector looking into
the mating face of the chassis mounted socket.
A suitable free socket is detailed in Table 2 on page 3.
T6T VHF 50 W Transmitter Page 12 Installation
Back to Transmitter
Main Page
Rear Panel Connectors
The rear panel connectors are shown in Fig 8 and listed in Table 4. Select which connectors are going
to be used and then make connections as required.
Fig 8 Rear Panel (Connectors)
Table 4 Rear Panel Connector Usage
Connector Type Usage
AC Supply IEC Terminating the ac input supply.
DC Supply XLR 3-pin Terminating the dc input supply.
Antenna N-type Terminating the antenna feeder coaxial cable.
External Speaker 3.5 mm stereo jack Connects an external loudspeaker for monitoring sidetone.
MARC 9-way D-type Used to connect to a MARC remote site equipment.
Used to connect a T6 controller or hub.
Used to terminate remote audio and PTT signals when a
remote site equipment or T6 controller is not used.
MARC Audio RJ48 Used as an alternative to the MARC connector for terminating
remote audio and PTT signals.
MARC Data RJ48 Used as an alternative to the MARC connector for terminating
data signals to and from a compatible data system.
Facilities 15-way D-type Provides a number of optional facilities that can be used as
required.
T1/E1 RJ48 Used for connecting the radio to a Mode 3 network computer,
connecting a transmitter and receiver together as a Mode 2
base station, or for connecting to a digital voice and data net-
work.
HLDC RJ48 Used to connect to a Mode 2 network computer.
ANTENNA
DANGER HIGH
RF VOLTAGES
CONNECT
ANTENNA
BEFORE
USE
T1/E1 HDLC MARC
DATA MARC
AUDIO MARC FACILITIES
21. 6 - 32 V 10 A
POWER 400VA max
~ 110 - 240V ( +10%) 4A
SEE INSTALLATION INSTRUCTIONS BEFORE
CONNECTING SUPPLIES
DISCONNECT SUPPLIES WHEN NOT IN USE
DC SUPPLY
AC SUP PLY
48 - 62Hz
FUSE F1
F15A 32V
110V - 120V T4A 125V UL
110-240V T4A 250V IEC
RATINGS
FUSE F2
DC SUPPLY
FUSE F2
FUSE F1
SUPPLY
AC SUPPLY
T6T VHF 50 W Transmitter Page 13 Installation
Back to Transmitter
Main Page
MARC Connector
The MARC connector is a 9-way D-type socket used to connect the transmitter to a MARC remote site
equipment, or it can also be used for normal remote operation.
As an alternative to using this connector, the RJ48 style MARC Audio and MARC Data connectors can
be used to provide the same functions.
The MARC connector pin-out is shown below and detailed in Table 5.
Note ...
The line level figures shown for the MARC connector are the limits when testing the transmitter using
a sine wave; the line level will be 10 dB above the line level setting. See the information supplied
under the heading ‘Line Level Settings’ in Operation.
Table 5 MARC Connector
Pin Number Signal Characteristic
1 Ground 0 V
2
3
Audio line in (+)
Audio line in (-)
Balanced 600 ohm, -20 to +20 dBm.
Phantom keying can be superimposed on the audio
lines. See Fig 10.
4 PTT input Remote PTT signal input. See Fig 9.
5 Output supply This output is between 21.6 and 32 Vdc (nominally
28 V) fused at 500 mA.
6
7
Data in (+)
Data In (-)
RS422 differential asynchronous data at 9600 baud,
8 data bits, 1 stop bit, no parity, no handshaking.
8
9
Data Out (+)
Data Out (-)
RS422 differential asynchronous data at 9600 baud,
8 data bits, 1 stop bit, no parity, no handshaking.
Pin-out of MARC connector looking into the mating face of the
chassis mounted socket.
A suitable free socket is detailed in Table 2 on page 3.
15
69
T6T VHF 50 W Transmitter Page 14 Installation
Back to Transmitter
Main Page
MARC Audio Connector
The MARC Audio connector is an 8-way RJ48 socket. It can be used as an alternative to the MARC
connector for audio and PTT connections. The connector pin-out is shown below and detailed in Table 6.
Note ...
The line level figures shown for the MARC Audio connector are the limits when testing the
transmitter using a sine wave; the line level will be 10 dB above the line level setting. See the
information supplied under the heading ‘Line Level Settings’ in Operation.
Table 6 MARC Audio Connector
Pin Number Signal Characteristic
1
2
Audio line in -
(input)
Audio line in +
(input)
Balanced 600 ohm, -20 to +20 dBm.
Phantom keying can be superimposed on the audio
lines. See Fig 10.
3 Fast antenna
changeover/PTT
(output)
Open collector NPN transistor grounding output,
200 mA max, configurable n/o or n/c).
4 Not used -
5 Not used -
6 PTT (input) Remote PTT signal input. See Fig 9.
7 Ground 0 V.
8 Not used -
Pin 1
RJ48 Plug
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.
T6T VHF 50 W Transmitter Page 15 Installation
Back to Transmitter
Main Page
Fig 9 Remote Keying
Fig 10 Phantom Keying
T6T Transmitter
MARC Audio Connector
audio is pins 1 and 2
Audio line 1
Audio line 2
PTT Reference Voltage
(0 V, +14 V or -14 V)
Set from front panel
PTT
Switch
VPTT
The transmitter reference voltage (0 V, +14 V or -14 V) is selected from the Polarities screen.
❑PTT is active when VPTT differs from the transmitter reference voltage by more than ±10 V.
❑PTT is inactive when VPTT differs from the transmitter reference voltage by less than ±1 V.
❑Maximum value of VPTT is ±60 V with respect to transmitter reference voltage.
Example:
To use 0 V as the keying potential, VPTT = 0 V; set transmitter reference voltage to +14 V; set PTT In to STD.
Cross-Site Lines
Audio
Circuit
PTT input requires at least 1 mA to operate.
Input will draw no more than 6 mA.
PTT is pin 6
MARC Connector
audio is pins 2 and 3
PTT is pin 4
MARC or
MARC Audio
Connector
Control
Equipment ground is pin 7.
ground is pin 1.
T6T Transmitter
PTT
Switch
Reference Voltage
(0 V, +14 V or -14 V)
Set from front panel
V
PTT
To reduce the number of cross-site lines between the control site and the transmitter, phantom keying may be employed.
This method has the keying potential (VPTT) superimposed on the audio lines instead of using a separate line.
The transmitter reference voltage (0 V, +14 V or -14 V) is selected from the Polarities screen.
❑PTT is active when VPTT differs from the transmitter reference voltage by more than ±10 V.
❑PTT is inactive when VPTT differs from the transmitter reference voltage by less than ±1 V.
❑Maximum value of VPTT is ±60 V with respect to transmitter reference voltage.
Example:
To use 0 V as the keying potential, VPTT = 0 V; set transmitter reference voltage to +14 V; set PTT In to STD.
Audio lines with phantom keying
signal superimposed
PTT input requires at least 1 mA to operate.
Input will draw no more than 6 mA.
MARC Audio Connector:
Audio is pins 1 and 2
MARC Connector:
Audio is pins 2 and 3
MARC or
MARC Audio
Connector
Audio
Circuit
Control
Equipment
T6T VHF 50 W Transmitter Page 16 Installation
Back to Transmitter
Main Page
MARC Data Connector
The MARC Data connector is an 8-way RJ48 socket. It can be used as an alternative to the MARC
connector for data connections. The connector pin-out is shown below and detailed in Table 7.
Table 7 MARC RJ48 Data Connector
Pin Number Signal Characteristic
1
2
Data in (-)
Data in (+)
RS422 differential asynchronous data, 9600 baud,
8 data bits, 1 stop bit, no parity, no handshaking.
3 Not connected -
4
5
Data out (+)
Data out (-)
RS422 differential asynchronous data, 9600 baud,
8 data bits, 1 stop bit, no parity, no handshaking.
6 Remote Supply ON/OFF 0 V to switch off.
Note: Rear panel switch must be in ON position for
this function to operate.
7 Ground 0 V.
8 Output supply This output is between 21.6 and 32 Vdc (nominally
28 V) fused at 500 mA.
Pin 1
RJ48 Plug
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.
T6T VHF 50 W Transmitter Page 17 Installation
Back to Transmitter
Main Page
T1/E1 Connector
The T1/E1 connector is an 8-way RJ48 socket used for connecting to a Mode 3 network computer or
connecting a transmitter and receiver together when operating as a Mode 2 base station. The connector
pin-out is detailed in Table 8.
Table 8 T1/E1 Connector
Pin Signal Characteristic
1 RRing T1 - Balanced 100 ohm (±10%), 1.544 Mbits per second (±50 ppm), AMI/B8ZS Coding.
E1 - Balanced 120 ohm (±10%), 2.048 Mbits per second (±50 ppm), AMI/HDB3 Coding.
Protected with 28 V differential and common mode clamp and 1.25 A fuse in each line.
2RTip
3 Not connected -
4 TRing T1 - Balanced 100 ohm (±10%), 1.544 Mbits per second (±50 ppm), AMI/B8ZS Coding.
E1 - Balanced 120 ohm (±10%), 2.048 Mbits per second (±50 ppm), AMI/HDB3 Coding.
Protected with 28 V differential and common mode clamp and 1.25 A fuse in each line.
5TTip
6 Not connected -
7 Not connected -
8 Not connected -
Pin 1
RJ48 Plug
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.
T6T VHF 50 W Transmitter Page 18 Installation
Back to Transmitter
Main Page
HDLC Connector
The HDLC connector is an 8-way RJ48 socket used for connecting to a Mode 2 network computer. The
connector pin-out is detailed in Table 9.
.
Table 9 HDLC Connector
Pin Signal Characteristic
1 HDLC RX A
(input) RS422 differential synchronous data, 128 kbytes per second
(±50 ppm).
2 HDLC RX B
(input)
3 HDLC CL A
(output)
RS422 differential synchronous data, 128 kbytes per second
(±50 ppm).
4 HDLC TX B
(output) RS422 differential synchronous data, 128 kbytes per second
(±50 ppm).
5 HDLC TX A
(output)
6 HDLC CL B
(output) Pair to pin 3.
7 Ground 0 V.
8 Output supply This output is between 21.6 and 32 Vdc (nominally 28 V) fused at
500 mA.
Pin 1
RJ48 Plug
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.
T6T VHF 50 W Transmitter Page 19 Installation
Back to Transmitter
Main Page
External Speaker
The External Speaker connector is a 3.5 mm stereo jack used for connecting an external speaker to the
transmitter to provide sidetone. This speaker should be a high impedance active type.
Table 10 External Speaker
Pin Signal Characteristic
Tip Speaker Drive (output) 0 to 3 V pk-pk. Connected directly to Ring.
Ring Speaker Drive (output) 0 to 3 V pk-pk. Connected directly to Tip.
Sleeve Ground 0 V.
T6T VHF 50 W Transmitter Page 20 Installation
Back to Transmitter
Main Page
Facilities Connector
The Facilities connector is a 15-way D-type filtered socket used for connecting to associated parts of a
system. The connector pin-out is detailed in Table 11.
Table 11 Facilities Connector
Pin Number Signal Characteristic
1 Ground 0 V.
2 E-BIT (input) An external BIT input that connects from any ancillary equipment
having a compatible BIT alarm output.
When this input is active, the transmitter’s front panel Alarm indicator
flashes and an E-BIT message is displayed on the display. The input is
TTL having a 4.7 kohm pull-up resistor to 5 V. The input is
configurable from the front panel to be active high or low.
3 PTT output Grounding solid state relay. +60 to -60 V, ac or dc, 100 mA max,
configurable n/o or n/c. Activated 35 ms (±1 ms) before the start of the
power ramp up to allow for the antenna relay pull-in time.
4 External VSWR input Used to indicate an external VSWR fault. TTL input with 4.7 kohm pull-
up to 5 V. Configurable active high or low.
5
6
Antenna changeover
(output)
Antenna changeover
common (output)
Solid state relay linked to pin 6. See Fig 11 for further detail.
Solid state relay linked to pin 5.
7 Not used -
8 Ground 0 V.
9 Output supply This output is between 21.6 and 32 Vdc (nominally 28 V) fused at
500 mA.
10 Inhibit (Input) Active signal prevents the transmitter keying. TTL with 4.7 kohm pull-
up to 5 V. Configurable active high or low.
11 BIT interruptive test
(input)
Active signal initiates a BIT test. TTL with 4.7 kohm pull-up to 5 V.
Configurable active high or low. Must be asserted for >300 ms.
12 Not used -
13 Ready (output) An output that is active when the radio is ready to transmit and no
faults are detected. Open collector NPN transistor grounding output,
200 mA max, configurable n/o or n/c.
14 Tape (output) An audio output for connection to a recording system. 0 dBm fixed
output into 600 ohm for 90% modulation depth.
15 Reserved (output) Do not connect to pin 15 unless advised to do so by Park Air.
18
915
Pin-out of Facilities connector looking into the mating face of
the chassis mounted socket.
A suitable free socket is detailed in Table 2 on page 3.
T6T VHF 50 W Transmitter Page 21 Installation
Back to Transmitter
Main Page
Fig 11 Example: Using the Antenna Changeover Output
T6T Transmitter
6
5
Facilities
Connector
Antenna
T6T Transmitter
Facilities
Connector
Antenna
9
28 Vdc (nominal)
Control
(Main)
(Standby)
Antenna
Main/Standby
Transmit Relay
Example
This example shows the Antenna Changeover Output configured to control the antenna switching between main
and standby transmitters. The potential on Facilities connector pin 6 is switched through to pin 5 when the standby
transmitter is keyed; in this example, pin 6 is linked to ground. This energizes the Main/Standby Transmit Relay to
route the standby transmitter to the antenna.
Other Configurations
The antenna changeover output can be configured in other ways to suit the user’s requirement subject to:
❑Pin 6 can be any potential between -60 and +60 Vac, or dc.
❑The maximum current drawn must not exceed 100 mA.
❑The output at pin 5 is configurable normally open or normally closed from the Polarities screen.
❑The internal solid state switch activates 35 ms before the start of the power ramp to allow for the antenna
relay pull-in time.
8
Solid State
Relay
Link
T6T VHF 50 W Transmitter Page 22 Installation
Back to Transmitter
Main Page
Chassis Stud Connection
A chassis stud is fitted to the transmitter's rear panel. This stud is used to connect the
equipment to the equipment cabinet, or to the user's system earth point. The stud must not
be used as the safety earth.
In order not to compromise the transmitter’s Electromagnetic Compatibility (EMC) the chassis stud,
marked and fitted to the rear panel (see Fig 8) must be connected to the equipment cabinet (if a
cabinet is being used) or to the user's system earth point. The connection should be made using a single
tri-rated, green-and-yellow cable having a cross-sectional area of 2.5 mm2. The cable should have CSA
and UL1015 approval, and be connected to the chassis stud through an M6 eyelet (for example, Park Air
part number 20-08010103).
Failure to comply with this instruction could result in non-compliance with the European
Commission EMC Directive 89/336/EEC.
Connect the Antenna
The antenna connector is an N-type socket suitable for connecting a 50 ohm antenna.
Connect the DC Input Supply
The transmitter operates from either an ac, or a dc input supply. When both ac and dc are connected,
operation from the ac supply takes priority; automatic change-over to the dc supply occurs if the ac
supply fails. On restoration of the ac supply, the equipment reverts to ac operation.
A dc input supply connector (see Fig 12) is fitted to the equipment's rear panel. The recommended
minimum rating of the dc supply cable is: 2-core having a cross-sectional area of 1.5 mm2 per core. The
supply cable should be fitted with an XLR 3-pin socket (Park Air part number 20-01030106).
Fig 12 DC Connector
WARNING Chassis Earth
Positive Negative
Not used
Pin-out of DC connector looking
into the mating face of the chassis
mounted socket.
T6T VHF 50 W Transmitter Page 23 Installation
Back to Transmitter
Main Page
Connect the AC Input Supply
The equipment is permanently connected to the mains supply when the mains connector is
attached. Switching the rear panel Power switch to off does not isolate all internal circuits
from the mains supply. For this reason, a mains isolating switch should be fitted close to,
and easily accessible from, the transmitter's position. The isolation switch should isolate
both live and neutral supplies, be clearly labelled, and adequately rated to protect the
equipment.
This equipment must be earthed. The earth terminal of the ac connector should be used as
the safety earth.
An ac input connector is fitted to the equipment’s rear panel. The cable used to connect between the
equipment and the user’s ac power source should be 3-core (to IEC 227) rated 250 Vac at 8 amps, and
have a minimum cross-sectional area of 1.0 mm2 per core. Park Air recommends the use of polyvinyl
chloride (PVC) insulated cable. The cable must be fitted with the IEC approved equipment connector and
conform to the following specification:
❑If PVC insulated, be not lighter than ordinary polyvinyl chloride sheathed flexible cord according
to IEC publication 227 (designation H05 VV-F, or H05 VVH2-F).
❑If rubber insulated, be of synthetic rubber and not lighter than ordinary tough rubber-sheathed
flexible cord according to IEC publication 245 titled ‘Rubber Insulated Cables of Rated Voltages
up to and Including 450/750 V (designation H05 RR-F)’.
The T6T transmitter is a Class 1 equipment. The ac supply cable should have a green-and-yellow
protective earthing conductor electrically connected to the protective earthing terminal of the equipment
connector and the mains plug. Park Air recommends the ac supply cable is colour coded in accordance
with the electrical appliance (colour code) regulations for the UK. That is:
WARNING Dangerous Voltages
WARNING Earth Connection
FS2
Spare Fuse
Line
Neutral
Earth
❑The core coloured green-and-yellow must be
connected to the terminal in the plug that is
marked with the letter E or by the earth symbol
or coloured green-and-yellow.
❑The core coloured blue must be connected to
the terminal that is marked with the letter N or
coloured black.
❑The core coloured brown must be connected to
the terminal that is marked with the letter L or
coloured red.
Holder for spare
fuse (not supplied)
T6T VHF 50 W Transmitter Page 24 Installation
Back to Transmitter
Main Page
Switching On
When the POWER SWITCH is set to the Standby position, dangerous voltages are still
present in the transmitter's internal power supply circuitry. To ensure safe working, the
transmitter must be isolated from the ac and dc input supplies
When installation is complete, the transmitter should be switched on at the rear panel 2-way rocker
Power switch. The Power switch is used to switch on, and switch off, power to the transmitter's circuitry
but does not remove power from the radio.
Under normal circumstances this screen is displayed for a few seconds when the radio is switched on.
The bottom row begins empty and dots are added as the initialisation progresses. When the initialisation
is complete the Main Screen is displayed.
Setting Up
When installation has been successfully completed the transmitter must be set up using the front panel
conntrols or the VFP.
Setting up is detailed in the Operation section of this documentation.
T 6 D i g i t a l R a d i o
( c ) 2 0 0 3 P a r k A i r
I n i t i a l i s i n g . . . .
...............
WARNING Dangerous Voltages
= Standby= On
When setting up the transmitter, pay particular attention to the Polarities of any
functions that have been hard-wired during installation. For example, the polarity of
the PTT input and the polarity and configuration of the Antenna Changeover output.
Failure to select the correct settings will result in incorrect operation.
Back to Transmitter
Main Page
Maintenance
T6T 50 W VHF Transmitter Page 2 Maintenance
Back to Transmitter
Main Page
Introduction
This section gives the scheduled and unscheduled maintenance procedures for the T6T transmitter and
shows how to use the Virtual Front Panel (VFP).
Scheduled Maintenance A scheduled maintenance procedure is given on page 3. Park Air
recommends that this task be completed every twelve months.
Unscheduled Maintenance Normally, the T6 transmitter is considered a Line Replaceable Unit
(LRU) and should be replaced with a serviceable spare if a fault
occurs. The faulty transmitter should then be returned to Park Air
for repair.
In certain circumstances, Park Air Customer Support may
suggest that the user change one of the transmitter modules.
Dismantling and assembly instructions are therefore given under
the heading Unscheduled Maintenance starting on page 7.
Using the VFP Operating parameters can be set from the transmitter front panel,
or by using the VFP. Some additional functions are available from
the VFP. See page 18.
T6T 50 W VHF Transmitter Page 3 Maintenance
Back to Transmitter
Main Page
Scheduled Maintenance
Park Air recommends that scheduled maintenance is carried out at twelve-monthly intervals. Scheduled
maintenance comprises the following checks:
Cleaning and Checking Security of Connectors
Remove all dust and dirt from the equipment's exterior using a lint free cloth and camel hair brush. Check
all external connections are secure and free from damage.
Setting the Transmitter’s Internal Reference Frequency
To set the transmitter’s internal reference frequency, use the following procedure. Note that references
to the switch in the procedure mean the Scroll/Select switch.
(6) Turn the switch clockwise until Exit is highlighted, then press the switch. You are returned to the
Main screen.
(7) Disconnect the frequency counter.
Number Check Tools/Test Equipment Required
1 Ensure the equipment is clean and that external
connectors are securely fitted. Camel hair brush/clean lint-free
cloths
2 Check and reset (if required) the transmitter's
frequency standard. VHF Frequency Counter
3 Perform a BIT interruptive test.
4 Perform an ac and dc change-over check (if both
supplies are connected).
Control Screen
Settings Screen
Fr equency
Channel
S e t t i n g s
E x i t
B a n d E d g e s
R e f F r e q 5 0 . 0 %
B a c k l i g h t 0 3 0 s
E x i t < < > >
(1) Ensure the transmitter does not have
an offset
(2) Connect a frequency counter to the
front panel Reference connector.
(3) From the Main screen, press the switch
to display the Control screen. Turn the
switch until Settings is highlighted.
Press the switch.
(4) Ensure the Settings screen is
displayed. Turn the switch until Ref
Freq is highlighted, then press the
switch.
(5) With Ref Freq selected turn the switch
clockwise or anti-clockwise until the
frequency counter reads 20.950000
MHz ±10 Hz, then press the switch.
T6T 50 W VHF Transmitter Page 4 Maintenance
Back to Transmitter
Main Page
(8) If not 5-carrier offset, refer to AM Voice Mode Settings Screen in the Operation section of this
document and set to the required offset.
(9) If 5-carrier offset is required, restore the carrier offset using the following routine:
❑Connect a 50 ohm frequency counter, through a 60 dB attenuator, to the transmitter’s rear
panel Antenna connector (see Fig 1 for location of the Antenna connector).
❑Refer to AM Voice Mode Settings Screen in the Operation section of this document and set
the desired 5-carrier offset.
❑Refer to Changing the Transmitter’s Operating Frequency in this document and set the
transmitter to the nearest 25 kHz channel frequency. For example, if the required frequency
is 124.504 (+4 kHz offset), set the transmitter to 124.500 MHz.
❑Key the transmitter and adjust the reference frequency, using the front panel Scroll/Select
control, until the frequency counter displays the required operating frequency. For example
124.504 MHz.
❑When the frequency counter displays the exact operating frequency, press the Scroll/Select
control and stop keying the transmitter.
❑Disconnect the test equipment and reconnect the antenna.
T6T 50 W VHF Transmitter Page 5 Maintenance
Back to Transmitter
Main Page
To Initiate a BIT Test
An interruptive BIT test cannot be initiated in Mode 2 or Mode 3.
(1) From the Main screen, press the switch to
display the Control screen. Turn the switch
until BIT is highlighted. Press the switch.
(2) Ensure the BIT menu is displayed. Turn
the switch until BIT Initiate is highlighted.
Press the switch.
(3) During the test, which takes approximately
two seconds, the Testing screen is
displayed.
(4) After the test, either a Pass or Fail screen
is displayed. Selecting OK takes the user
back to the BIT screen.
(5) If fail is displayed, scroll through the screen
to check the cause of the failure.
During an interruptive BIT test, the transmitter radiates modulated carrier waves at the set power.
Users should therefore obtain the necessary authority before initiating a test.
If the test is to be carried out with the antenna disconnected, ensure a load is fitted to the
transmitter's Antenna connector.
In order to test the line input stages, an internally generated 1 kHz tone is injected into the line input
circuit. Any other audio present on the line input will cause the test to be inaccurate. Therefore the
transmitter MUST NOT be keyed during the test.
B I T
S / W C o n f i g
St andby
E x i t < <
B I T I n i t i a t e
E T I 0 0 0 0 0 : 0 0 h r s
A C S u p p l y O N
E x i t > >
T e s t i n g
P l e a s e W a i t
T e s t S t a t u s
P A S S
O K
T e s t S t a t u s
F A I L
O K
T6T 50 W VHF Transmitter Page 6 Maintenance
Back to Transmitter
Main Page
AC and DC Change-over Check
If both ac and dc input supplies are connected to the transmitter, carry out the following check:
(1) Confirm that both ac and dc supplies are connected to the transmitter. Ensure that the rear panel
Power switch is set to the I (on) position.
(2) Confirm that the front panel Ready indicator is lit, the LCD is illuminated, and the transmitter is
operational.
(3) Switch off the ac supply from its source.
(4) Check that the transmitter continues to operate correctly from the dc supply. If accessed, the
front panel BIT screen will show AC Supply as off, and DC supply as on. The value of the dc
supply is also shown.
T6T 50 W VHF Transmitter Page 7 Maintenance
Back to Transmitter
Main Page
Unscheduled Maintenance
The instructions given in this document involve connecting dangerous voltages to the
transmitter. Maintenance should be carried out only by suitably qualified personnel.
When an ac supply is connected, dangerous voltages are present within the transmitter. Care
must be taken by personnel to avoid accidental contact with exposed circuitry during
maintenance or alignment procedures.
When the power switch is set to the Standby position, dangerous voltages are still present
in the transmitter's internal power supply circuitry. To ensure safe working, the ac and dc
input supplies must be disconnected from the transmitter.
The antenna used with the transmitter must be installed such that the resultant radiated field
strength is below 10 W/m² in areas normally accessible to personnel.
The T6 transmitter's circuitry contains Electrostatic Sensitive Devices (ESSDs). Personnel
must be aware of the precautions necessary to prevent damage to such devices.
Changes or modifications made to this equipment that are not expressly approved by
Park Air, or parties authorized by Park Air, could void the user’s authority to operate the
equipment.
When carrying out repairs to the PA module, care must be taken not to damage the gasket.
If the strips become damaged, they must be replaced. Failure to comply with this instruction
may compromise the transmitter’s Electromagnetic Compatibility (EMC) and breach
European Commission regulations.
When screws are inserted into the transmitter PA casting care must be taken not to exceed
a torque of 6 Ibs/inch when tightening. This applies when replacing the top and bottom
covers and during the refitting of the PA module.
WARNING Dangerous Voltages
WARNING Antenna Radiation
Caution ESSDs
Caution Unauthorized Modifications
Caution Repairs
T6T 50 W VHF Transmitter Page 8 Maintenance
Back to Transmitter
Main Page
Introduction
This document provides the user with detailed instructions on the removal and replacement of modules
and assemblies.
(1) When removing or refitting modules, observe antistatic handling precautions.
(2) Do not change any potentiometer (or link) settings unless detailed in these instructions.
Potentiometers have been set using specialist equipment.
(3) The transmitter uses the following Molex KK connectors:
CN2 on the PA Control module
CN7 and CN6 on the PSU Regulator module.
To remove KK type connectors:
❑Free the locking mechanism on the connector by moving one side of the connector up, then
move the other side up (see the following diagram). The upward motion should only be as far
as needed to free the locking mechanism
❑DO NOT pull the cable to free the connector
❑Note that KK type connectors are designed to be removed in this manner to free the locking
mechanism. Do not use this procedure with non-KK type connectors as damage to the
connector may occur.
Tools, Materials and Test Equipment Required
The following tools, materials and test equipment should be made available to complete the
maintenance tasks described in this section:
❑Personal Computer (PC)
❑General Purpose Tool kit (including a
1.5 mm Allen key)
❑5 mm Nut Spinner
❑Camel Hair Brush
❑Clean Lint-free Cloths
❑Frequency Counter
❑Power Meter
❑Dummy Load
❑PC to Radio Interconnection Lead
(Park Air part number 17E12600001)
❑SMB to BNC Lead for reference frequency
(Park Air part number 17K11000004)
Lift 2Lift 1
PCB
T6T 50 W VHF Transmitter Page 9 Maintenance
Back to Transmitter
Main Page
Top Cover
To remove the top cover, locate and unscrew the 18 countersunk screws securing the top cover to the
mainframe. Access can then be gained to the following modules:
❑Processor module
❑PSU Regulation module
❑Power Supply (requires top cover and bottom cover to be removed)
❑RF PA module (requires top cover and bottom cover to be removed)
❑Front Panel assembly PCB (requires top cover and bottom cover to be removed)
Removing and Refitting the Processor Module
The Processor module is located as shown in Fig 3. A module removal diagram is shown in Fig 4.
Dangerous voltages are present within the transmitter. Care must be taken by personnel to
avoid accidental contact with exposed circuitry when the top cover is removed and power is
applied to the radio.
Removal
Before attempting to remove the Processor module, and if possible, save the radio’s settings. To achieve
this connect a PC with the VFP software loaded to the radio using the PC to Radio Interconnection Lead
(Park Air part number 17E12600001). With the VFP software active, upload the radio settings to a
specified file.
Ensure that the transmitter is isolated from the ac and dc input supplies. Then proceed as follows:
(1) Unscrew the 18 countersunk screws and remove the transmitter’s top cover.
(2) Locate the Processor module (Fig 3) and disconnect the following connectors (Fig 4):
❑CN1 50-way connector (50-way ribbon cable from PA Control module)
❑CN3 14-way connector (14-way ribbon cable from PSU Regulator module)
❑CN4 34-way connector (34-way ribbon cable from Front Panel module).
(3) Gain access to the rear of the transmitter. Using a 5 mm nut spinner tool, remove the four
screwloc 8 mm-4-40 UNC screws that secure the Processor module interface connectors CN5
and CN6 to the rear panel.
(4) Remove the seven M3 x 8 mm screws that secure the module to the transmitter’s mainframe.
(5) Remove the module from the chassis.
Refitting
To refit the Processor module, proceed as follows:
(1) Place the module in position. Ensure no wires are trapped by the module. Ensure jumper J2 on
the module is set to ‘T’ for transmitter (see the following diagram).
WARNING Dangerous Voltages
T6T 50 W VHF Transmitter Page 10 Maintenance
Back to Transmitter
Main Page
(1) Ensure the module’s interface connectors CN5 and CN6 are located correctly and are aligned
with the screw holes in the rear panel. Fit the four screwloc 8 mm-4-40 UNC screws and wavy
washers but leave them loose.
(2) Fit the 11 (Mod Strike 5 modules), 7 (Mod Strike 6 and 7 modules) M3 x 8 mm screws that secure
the module to the transmitter’s mainframe, but leave them loose.
(3) Using a 5 mm nut spinner, tighten the four screwloc 8 mm-4-40 UNC screws and wavy washers
that secure the connectors; then tighten the 11 (Mod Strike 5 modules), 7 (Mod Strike 6 and 7
modules) M3 x 8 mm screws that secure the module to the transmitter’s mainframe.
(4) Refit the following connectors to the module:
❑CN1 50-way connector (50-way ribbon cable from PA Control module).
❑CN3 14-way connector (14-way ribbon cable from PSU Regulator module).
❑CN4 34-way connector (34-way ribbon cable from Front Panel module).
(5) Re-establish the ac and/or dc supplies (take heed of the warning on page 9).
(6) Switch power on at the radio using the rear mounted Power switch.
(7) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(8) If a new module has been fitted, connect the VFP PC to the radio using the PC to Radio
Interconnection Lead, Park Air part number 17E12600001 (if not already connected). Note that
any module sent from Park Air as a spare for a particular radio will be programmed with
compatible operating and Fill software. Park Air keeps records of module software in all radios
supplied. Care must be taken when using a module removed from another radio as this module
may not have compatible software.
(9) Download the saved radio settings from file using the VFP. Alternatively, the settings can be
edited by hand as described in the Operation section of this
document Once entered, ensure the required settings appear in the VFP screen.
(10) Carry out the Calibrate routine using the VFP, as detailed in the procedure To Calibrate the
Transmitter on page 22.
(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.
(12) Set the transmitter’s internal reference frequency by carrying out the procedure detailed on
page 3.
IC25
T2 C84
TS7
T3
IC27
JP2
Shown set for
transmitter
T
T
R/TR
R/TR
IC21
IC20IC19
IC38
T6T 50 W VHF Transmitter Page 11 Maintenance
Back to Transmitter
Main Page
(13) Remove the VFP connector and switch power off at the transmitter using the rear mounted
Power switch. Isolate the transmitter from the ac and/or dc supplies.
(14) Refit the transmitter’s top cover (take note of repairs caution (1) on page 7 before carrying out
this task). The transmitter can now be returned to service.
Removing and Refitting the PSU Regulator Module
The PSU Regulator module is located as shown in Fig 3. A module removal diagram is shown in Fig 5.
Removal
Before attempting to remove the PSU Regulator module, ensure that the transmitter is isolated from the
ac and dc input supplies. Then proceed as follows:
(1) Remove the transmitter’s top cover as described on page 9 (take heed of the warning).
(2) Locate the PSU Regulator module and remove the three M3 x 8 mm captive washer screws that
secure the module to the transmitter’s mainframe.
(3) Carefully raise the module to gain access to the module connectors.
(4) Disconnect the following connectors:
❑CN5 10-way connector (10-way ribbon cable to PA Control module)
❑CN6 6-way connector (2-way loom to power supply). Note caution (3) on page 8
❑CN4 14-way connector (14-way ribbon cable to Processor module)
❑CN3 3-way connector (3-wire loom to PA module)
❑CN7 3-way connector (3-wire loom to rear panel On/Off switch). Note caution (3) on page 8
❑CN2 2-way connector (2-wire loom from dc input connector on rear panel)
❑CN1 4-way connector (4-wire cable from power supply)
❑CN9 2-way connector (2-wire cable ac input to power supply)
❑CN8 3-way connector (2-wire loom to rear panel ac input connector plus chassis connection).
(5) Remove the module from the chassis.
Refitting
To refit the PSU Regulator module, proceed as follows:
(1) While holding the module in position, connect the following connectors:
❑CN8 3-way connector (2-wire loom to rear panel ac input connector plus chassis connection)
❑CN9 2-way connector (2-wire cable ac input to power supply)
❑CN1 4-way connector (4-wire cable from power supply)
❑CN2 2-way connector (2-wire loom from dc input connector on rear panel)
❑CN7 3-way connector (3-wire loom to rear panel On/Off switch)
❑CN3 3-way connector (3-wire loom to PA module)
❑CN4 14-way connector (14-way ribbon cable to Processor module)
❑CN6 6-way connector (2-way loom to power supply)
❑CN5 10-way connector (10-way ribbon cable to PA Control module).
(2) Locate the module in position. Ensure no wires are trapped by the module.
T6T 50 W VHF Transmitter Page 12 Maintenance
Back to Transmitter
Main Page
(3) Secure the module to the transmitter’s mainframe using the three M3 x 8 mm captive washer
screws removed during the removal procedure.
(4) Re-establish the ac and/or dc supplies (take heed of the warning on page 7).
(5) Switch power on at the radio using the rear mounted Power switch.
(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(7) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.
(8) Switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter
from the ac and/or dc supplies.
(9) Refit the transmitter’s top cover. The transmitter can now be returned to service.
Bottom Cover
To remove the bottom cover, locate and unscrew the 15 countersunk screws securing the bottom cover
to the mainframe. Access can then be gained to the following modules:
❑PA Control module
❑Power Supply (requires top and bottom covers to be removed)
❑PA module (requires top and bottom covers to be removed)
❑Front Panel assembly (requires top and bottom covers to be removed).
Dangerous voltages are present within the transmitter. Care must be taken by personnel to
avoid accidental contact with exposed circuitry when the bottom cover is removed and
power is applied to the radio.
Removing and Refitting the PA Control Module
The PA Control module is located as shown in Fig 3. A module removal diagram is shown in Fig 6.
Removal
Before attempting to remove the PA Control module, ensure that the transmitter is isolated from the ac
and dc input supplies. Then proceed as follows:
(1) Remove the transmitter’s bottom cover as described above (take heed of the warning).
(2) Locate the module and disconnect the following connectors:
❑CN1 50-way connector (50-way ribbon cable from Processor module)
❑CN6 10-way connector (10-way ribbon cable from PSU Regulator module)
❑CN5 SMB connector (reference frequency)
❑CN3 SMB connector (RF drive)
❑CN4 SMB connector (forward power sense)
❑CN2 6-way connector (5-wire loom to PA module).
(3) Remove the seven M3 x 8 mm captive washer screws that secure the module to the transmitter’s
mainframe.
(4) Remove the module from the chassis.
WARNING Dangerous Voltages
T6T 50 W VHF Transmitter Page 13 Maintenance
Back to Transmitter
Main Page
Refitting
To refit the PA Control module, proceed as follows:
(1) Place the module in position. Ensure no wires are trapped by the module.
(2) Fit the seven M3 x 8 captive washer screws that secure the module to the transmitter’s
mainframe.
(3) Refit the following connectors to the module:
❑CN2 6-way connector (5-wire loom to PA module)
❑CN4 SMB connector (forward power sense)
❑CN3 SMB connector (RF drive)
❑CN5 SMB connector (reference frequency)
❑CN6 10-way connector (10-way ribbon cable from PSU Regulator module)
❑CN1 50-way connector (50-way ribbon cable from Processor module).
(4) Re-establish the ac and/or dc supplies (take heed of the warning on page 12).
(5) Switch power on at the radio using the rear mounted Power switch.
(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(7) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure
To Calibrate the Transmitter on page 22.
(8) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.
(9) Set the transmitter’s internal reference frequency by carrying out the procedure detailed on
page 3.
(10) Remove the VFP connector and switch power off at the transmitter using the rear mounted
Power switch. Isolate the transmitter from the ac and/or dc supplies.
(11) Refit the transmitter’s bottom cover. The transmitter can now be returned to service.
Removing and Refitting the Power Supply
The Power Supply is located as shown in Fig 3. A module removal diagram is shown in Fig 7.
Removal
Before attempting to remove the Power Supply, ensure that the transmitter is isolated from the ac and
dc input supplies. Then proceed as follows:
(1) Remove the transmitter’s top and bottom covers as described on page 9 and page 12 (take heed
of the warnings on those pages).
(2) Support the radio on its side.
(3) Locate the power supply. From the bottom half of the unit remove the four No. 6 x 32 UNC
countersunk screws that secure the power supply to the transmitter’s mainframe. During this
operation support the power supply from the top half of the unit.
(4) Withdraw the power supply from the chassis sufficient to allow access to the power terminal
blocks taking care not to damage the ac terminal plastic supply guard.
(5) Remove the connector CN4 (power supply to the power regulator).
(6) Disconnect the dc wires from the eight connector terminal block.
T6T 50 W VHF Transmitter Page 14 Maintenance
Back to Transmitter
Main Page
(7) Slide back the terminal block cover and disconnect the ac wires from the three connector terminal
block (marked L N E).
(8) Carefully remove the power supply from the transmitter.
Refitting
(1) With the transmitter on its side hold the power supply near to its securing position in the top half
of the radio.
(2) Slide back the terminal block cover and connect the ac wires to the three connector terminal
block (marked L N E); brown to terminal L, blue to terminal N and yellow/green to terminal E.
(3) Connect the dc wires to the eight connector terminal block; red to terminal 2 and terminal 3 and
black to terminal 6 and terminal 7.
(4) Connect connector CN4.
(5) Taking care not to damage the plastic supply guard, lower the power supply into position and
secure from the bottom half of the unit using the four countersunk screws.
(6) Re-establish the ac and/or dc supplies.
(7) Switch power on at the radio using the rear mounted Power switch.
(8) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(9) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.
(10) Switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter
from the ac and/or dc supplies.
(11) Refit the transmitter’s top and bottom covers. The transmitter can now be returned to service.
Removing and Refitting the PA Module
The PA module is located as shown in Fig 3. A module removal diagram is shown in Fig 8.
Removal
Before attempting to remove the PA module, ensure that the transmitter is isolated from the ac and dc
input supplies. Then proceed as follows:
(1) Remove the transmitter’s top and bottom covers as described on page 9 and page 12 (take heed
of the warnings on those pages).
(2) Remove CN3 from the PSU Regulator module.
(3) With the transmitter upside-down disconnect CN2 from the PA Control module.
(4) Disconnect the SMB connectors CN8 and CN10. Note that CN10 is located within the heatsink
fins and should be disconnected using long nosed pliers. Do not attempt to remove the connector
by pulling on the cable.
(5) Remove the black equipment handle from the PA side of the radio by unscrewing and removing
the two M5 x 16 mm panhead screws that secures it to the transmitter.
(6) Remove the six M3 x 8 mm countersunk screws and two M3 x 8 mm captive screws that secure
the PA from the bottom and top of the mainframe as shown in Fig 8. Ensure the PA module is
well supported during this operation.
(7) Withdraw the PA module from the mainframe taking care not to snag the wiring looms.
T6T 50 W VHF Transmitter Page 15 Maintenance
Back to Transmitter
Main Page
Refitting
To refit the PA module, proceed as follows:
(1) Place the module in position and butt it up to the mainframe. Ensure no wires are trapped by the
module.
(2) Fit the six M3 x 8 countersunk screws and two M3 x 8 mm captive screws that secure the module
to the transmitter’s mainframe.
(3) Fit the black equipment handle to the PA side of the radio using the two M5 x 16 mm panhead
screws.
(4) Connect the SMB connectors CN8 and CN10. Note that CN10 is located within the heatsink fins
and should be connected using long nosed pliers if unable to use fingers in the enclosed space.
(5) With the transmitter upside-down connect CN2 to the PA Control module.
(6) Fit CN3 to the PSU Regulator module.
(7) Re-establish the ac and/or dc supplies.
(8) Switch power on at the radio using the rear mounted Power switch.
(9) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(10) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure
To Calibrate the Transmitter on page 22.
(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.
(12) Remove the VFP connector and switch power off at the transmitter using the rear mounted
Power switch. Isolate the transmitter from the ac and/or dc supplies.
(13) Refit the transmitter’s top and bottom covers. The transmitter can now be returned to service.
Removing and Refitting the Front Panel Assembly PCB
The Front Panel assembly is located as shown in Fig 3. An assembly and PCB removal diagram is shown
in Fig 9.
Removal
Before attempting to remove the Front Panel assembly PCB, ensure that the transmitter is isolated from
the ac and dc input supplies. Then proceed as follows:
(1) Remove the transmitter’s top and bottom covers as described on page 9 and page 12 (take heed
of the warnings on those pages).
(2) Disconnect CN4 at the Processor module. Carefully pull the cable through the aperture in the
mainframe to free it.
(3) Disconnect SMB connector CN5 at the PA Control module.
(4) Remove the four M3 x 8 mm countersunk screws from the bottom and top of the mainframe box
section (see Fig 9, Diagram A).
(5) Remove the two black equipment handles by unscrewing and removing the four M5 x 16 mm
panhead screws that secure them to the transmitter. The front panel can now be moved forward
and away from the mainframe.
(6) At the front panel, release the control knob by unscrewing the Allen head grub screw using a
1.5 mm Allen key. Withdraw the control knob from the spindle.
T6T 50 W VHF Transmitter Page 16 Maintenance
Back to Transmitter
Main Page
(7) Remove the Front Panel PCB from the Front Panel assembly by removing the six M3 x 6 mm
panhead screws and wavy washers (see Fig 9 Diagram B).
Refitting
To refit the Front Panel assembly PCB, proceed as follows:
(1) Place the PCB in position at the Front Panel assembly. Ensure the spindle of the control knob
and microphone/diagnostics connector are correctly located. Secure the PCB to the Front Panel
assembly using the six M3 x 6 mm panhead screws and wavy washers (see Fig 9, Diagram B).
(2) At the front panel, place the control knob onto the spindle and using a 1.5 mm Allen key, secure
the Allen head grub screw.
(3) Secure the Front Panel assembly to the top and bottom of the mainframe box section using the
four M3 x 8 mm countersunk screws. Fit the two black equipment handles using the four
M5 x 16 mm panhead screws (see Fig 9, Diagram A).
(4) Route the ribbon cable to the Processor module connector CN4 and connect it.
(5) Route the SMB connector to CN5 on the PA Control module and connect it.
(6) Re-establish the ac and/or dc supplies.
(7) Switch power on at the radio using the rear mounted Power switch.
(8) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(9) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 5.
(10) Switch power off at the transmitter using the rear mounted Power switch. Isolate the transmitter
from the ac and/or dc supplies.
(11) Refit the transmitter’s top and bottom covers. The transmitter can now be returned to service.
Removing and Refitting the Cooling Fan
The cooling fan is at the rear of the PA module as shown in Fig 3. An assembly and removal diagram is
shown in Fig 10.
Removal
Before attempting to remove the fan, ensure that the transmitter is isolated from the ac and dc input
supplies. Then proceed as follows:
(1) Disconnect the two-pin connector.
(2) Remove fan's finger guard.
(3) Using an Allen key, inserted through the holes in the fan exposed with the finger guard removed,
remove the three M4 x 12 mm caphead Allen screws that secure the fan to the PA module
heatsink.
(4) Remove the fan from the PA module.
Refitting
To refit the cooling fan, proceed as follows:
(1) Locate the fan in position and using a suitable Allen key inserted through the holes for the fan's
finger guard, secure using the three M4 x 12 mm caphead Allen screws.
(2) Secure the finger guard to the fan.
T6T 50 W VHF Transmitter Page 17 Maintenance
Back to Transmitter
Main Page
(3) Connect the 2-pin fan connector to the fan. Ensure the + marked socket mates with the + marked
plug on the fan.
(4) Re-establish the ac and/or dc supplies.
(5) Switch power on at the radio using the rear mounted Power switch.
(6) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit. The transmitter can
now be returned to service.
T6T 50 W VHF Transmitter Page 18 Maintenance
Back to Transmitter
Main Page
Virtual Front Panel (VFP)
Virtual Front Panel (VFP) software is supplied on CD-ROM and is compatible with any PC or laptop
running Windows 2000™ or Windows XP™. The VFP allows changes to a radio’s settings and channel
information, it displays the current BIT state, displays BIT history, allows security locks to be set, and
provides maintenance facilities.
A radio can be set up using the front panel Scroll/Select switch and LCD, or by using the VFP. Using the
VFP has several advantages over setting the transmitter from the front panel; these are:
❑A profile of the transmitter’s operation settings and channel information can be created, stored on
disk, and then recalled to download into other transmitters.
❑A print out of the transmitter’s profile can be made from the VFP.
❑Front Panel Lock is available only when using the VFP. As part of the transmitter’s Settings (see
typical screen display shown below), Front Panel Lock can be set to ON. When selected to on, no
settings or frequency information can be changed from the front panel.
❑If the transmitter is part of a MARC system or operates in a digital mode, a MARC Lock, HDLC
Lock and T1E1 Lock are available when using the VFP. When selected to on, no settings or
frequency information can be changed from the MARC equipment screen, or the digital control
equipment.
Typical VFP Screen - AM-Voice Profile Shown
T6T 50 W VHF Transmitter Page 19 Maintenance
Back to Transmitter
Main Page
Installing the VFP Software
The VFP software is supplied by Park Air on CD-ROM. The software can be run from the Main page or
installed on your PC via Explorer.
To install the software onto your PC:
(1) Using explorer, display the contents of the CD-ROM supplied by Park Air. Identify the file named
S0473Vxx.EXE (where xx is the version number).
(2) Using the mouse, right click on the file and then select Copy.
(3) Display the Windows desktop. Right click anywhere on the desktop and select Paste.
(4) Check that the VFP icon is shown on the desktop. Reposition the icon as required. The VFP
application is now installed on the PC’s desktop.
VFP Icon
VFP Features
The VFP screen is divided into four main windows: Settings, Channels, BIT and Status Information. Four
colours are used to display text. The colours have the following meanings:
❑Black indicates a valid parameter that has been accepted by the radio.
❑Red indicates an invalid parameter that has been rejected by the radio, or a BIT failure.
❑Green indicates text that has not yet been downloaded to the radio. Text loaded into the VFP from
a previously stored file, or any text that is manually amended is green until it is downloaded into
the radio; after being downloaded into the radio the text changes to black, or if it is invalid, to red.
❑Blue indicates Help text and is shown in the Status Information window.
The Menu Bar
The menu bar has four categories: File, Serial Port, Radio and Help.
FileHas the sub-categories: Open, Save and Print. These sub-categories allow the user to open
previously saved profiles, save a new profile, or print a profile.
A special sub-category: File > Save > Diagnostics should only be used when advised by Park Air.
Serial PortHas the sub-categories: Com 1 and Com 2. Before the VFP can be used, the appropriate
Com 1 or Com 2 must be selected to correspond with the PC’s Com Port used for the radio connection.
RadioHas the sub-categories: Retrieve, Send, Calibrate and Test.
This category allows a radio’s profile to be loaded into the VFP, allows a profile to be downloaded from
the VFP to a radio, calibrates a radio and initiates a BIT test.
HelpProvides detail about the VFP software.
Settings Window
This window lists all attributes that can be adjusted by the user. If any individual attribute is clicked on
using the mouse, help information is displayed in the Status Information window showing the range of
adjustment for that attribute. Click on the value and use the keyboard to amend it; press Enter to confirm
the new value noting that the amended text is green until it is downloaded into the radio.
T6T 50 W VHF Transmitter Page 20 Maintenance
Back to Transmitter
Main Page
Any invalid parameters are not indicated until the Settings are downloaded to the radio. It is the radio that
rejects invalid parameters, not the VFP.
The transmitter’s reference frequency setting is displayed in the window. Adjusting the reference
frequency is a maintenance operation that requires external test equipment to be connected. The value
shown in the Settings window should not be changed; instead, adjustment of the reference frequency
should be performed using the radio’s front panel controls as detailed on page 3.
Channels Window
Up to 100 preset channels can be stored in the radio. These are listed in the Channels window. Any
channel frequency can be amended by clicking on the value to amend it and pressing Enter to confirm
the new value. Note that the amended channel is green until it is downloaded into the radio.
Any invalid frequencies are not indicated until the Channels are downloaded to the radio. It is the radio
that rejects invalid frequencies, not the VFP.
BIT Window
Two lists of information are presented. The current BIT status and the BIT history. The BIT history shows
the last 100 entries.
Status Information Window
The Status Information window gives information regarding the type of radio, the software fills, recent
VFP actions and Help information.
To Change the Transmitter’s Profile or Save a Profile
(1) Using a radio to PC serial interconnection lead, Park Air part number 17E12600001, connect the
radio’s front panel Microphone/Diagnostics connector to the PC’s Com Port 1 or Com Port 2
(note which Com Port is used).
(2) Run up the VFP software and check that a blank VFP screen (as shown below) is displayed.
T6T 50 W VHF Transmitter Page 21 Maintenance
Back to Transmitter
Main Page
Blank VFP Screen
(3) At the Menu Bar, click on Serial Port and select either Com 1 or Com 2. The selection must
correspond to the port used to connect to the radio.
(4) Load the required information from the radio, or from a stored file. The required information can
be radio settings, frequency channels, BIT information, or all of these.
To load a previously stored file, selectFile > Open > All
or,File > Open >Settings
or,File > Open > Channel
or,File > Open > BIT
To load information from the radio, selectRadio > Retrieve > All
or,Radio > Retrieve > Settings
or,Radio > Retrieve > Channel
or,Radio > Retrieve > BIT
(5) If required, amend any radio Settings or Channel information.
(6) Download the radio’s profile as shown on the VFP screen to either the radio, or to a file.
To download into the radio, select Radio > Send > All
or,Radio > Send > Settings
or,Radio > Send > Channel
To download to a file, selectFile > Send > All
or,File > Send > Settings
or,File > Send > Channel
or,File > Send > BIT
T6T 50 W VHF Transmitter Page 22 Maintenance
Back to Transmitter
Main Page
(7) Check that after downloading to a radio, no invalid parameters are returned (such parameters
are displayed as red text). If there are invalid parameters, amend them and then repeat the
download.
(8) When there is no further requirement for using the VFP, exit the VFP software and disconnect
the radio from the PC.
To Initiate a BIT Test
(1) Using a radio to PC serial interconnection lead, Park Air part number 17E12600001, connect the
radio’s front panel Microphone/Diagnostics connector to the PC’s Com Port 1 or Com Port 2
(note which Com Port is used).
(2) Run up the VFP software and check that a blank VFP screen is displayed.
(3) At the Menu Bar, click on Serial Port and select either Com 1 or Com 2. The selection must
correspond to the port used to connect to the radio.
(4) At the Menu Bar select Radio > Test.
(5) An interruptive BIT test now takes place. The results are displayed in the BIT window.
(6) If there is no further requirement for using the VFP, exit the VFP software and disconnect the
radio from the PC.
To Calibrate the Transmitter
(1) Connect a dummy load via a power meter to the transmitter’s Antenna connector.
(2) Remove the transmitter’s bottom cover.
(3) Using a radio to PC serial interconnection lead, Park Air part number 17E12600001, connect the
radio’s front panel Microphone/Diagnostics connector to the PC’s Com Port 1 or Com Port 2
(note which Com Port is used).
(4) Run up the VFP software and check that a blank VFP screen is displayed.
(5) At the Menu Bar, click on Serial Port and select either Com 1 or Com 2. The selection must
correspond to the port used to connect to the radio.
(6) At the Menu Bar select Radio > Retrieve > All.
(7) At the Menu Bar select Radio > Calibrate. The Confirm screen will then be displayed to remind
you that a dummy load must be connected before proceeding.
During an interruptive BIT test, the transmitter radiates modulated carrier waves at the set power.
Users should therefore obtain the necessary authority before initiating a test.
If the test is to be carried out with the antenna disconnected, ensure a load is fitted to the
transmitter's antenna connector.
In order to test the line input stages, an internally generated 1 kHz tone is injected into the line input
circuit. Any other audio present on the line input will cause the test to be inaccurate. Therefore the
transmitter must not be keyed during the test.
T6T 50 W VHF Transmitter Page 23 Maintenance
Back to Transmitter
Main Page
(8) With the Confirm screen displayed and dummy load connected, select Yes to continue with the
calibrate routine. The Progress screen will then be displayed.
(9) When the PA Control/PA loop has been calibrated the Progress screen disappears and the VFP
screen reappears showing a calibration complete message in the Status Information window.
(10) Gain access to the PA Control module and identify RV8 (see component layout diagram on
page 24). From the transmitter’s front panel AM-Voice or AM-MSK Settings screen, select PTT
On.
(11) From the Settings pane of the VFP screen, note the RF power setting. Adjust RV8 until the power
meter reads this value.
(12) From the transmitter’s front panel AM-Voice or AM-MSK Settings screen select PTT Off, then
remove the power meter and dummy load. This completes the calibration routine.
(13) When there is no further requirement for using the VFP, exit the VFP software and disconnect
the radio from the PC.
T6T 50 W VHF Transmitter Page 24 Maintenance
Back to Transmitter
Main Page
Location of RV8
Location of PA Control Module RV8
Figs 1 to 10 follow
R130
R131
R125
C421
R135
RV8
CN4
R455
R456
C424
R348
D24
R231
R382 R243
TP10
Small Screening Can
RV8
Back to Transmitter
Main Page
Fig 1 T6T Front and Rear Panels
ANTENNA
DANGER HIGH
RF VOLTAGES
CONNECT
ANTENNA
BEFORE
USE
T1/E1 HDLC MARC
DATA MARC
AUDIO MARC FACILITIES
21.6 - 32V 10A
POWER 400VA max
~ 110 - 240V ( +10%) 4A
SEE INSTALLATION INSTRUCTIONS BEFORE
CONNECTING SUPPLIES
DISCONNECT SUPPLIES WHEN NOT IN USE
DC SUPPLY
AC SUPPLY
48 - 62 Hz
FUSE F1
F15A 32V
110V - 120V T4A 125V UL
110-240V T4A 250V IEC
RATINGS
FUSE F2
DC SUPPLY
FUSE F2
FUSE F1
SUPPLY
AC SUPPLY
Rear View
Front View
SA3597
SA3594
Back to Transmitter
Main Page
Fig 2 Wiring and Interconnection Diagram
CN2
Microphone/Diagnostics
Front P anel
CN3 CN1
Microph one /
Front Panel
Connections Name Characteristic
CN2-1 1 Ground - Microphone 0 V
CN2-6
2 Transmit Data RS232
CN2-3 3 MIC PTT
CN2-4 4 Receive Data RS232
CN2-5 5 Sidetone (Headset Drive) 3 Vac pk-pk, 200R
CN2-2
6 Microphone Input
CN2-7 7 Ground 0 V
CN4
CN5
Power Supply Regulation
CN2
1
2
2
3
1
CN3
1
3
2
CN1
4
dc I nput
Input-1 CN2-2 F used 21.6 to 32 V
dc Input
In put-2 CN 2- 1 Gro un d Su ppl y 0 V
Connections
DC Input Regulation
Name Characteristic
Input-3 n/c
Diagnostics
L
N
E
ac Input
CN1-3
CN1-2
CN1-1
Regulation
CN1-3
CN1-2
CN1-1
PSU
Connections
Ground Supply
Name Characteristic
CN1-4
0 V
CN3 CN4
CN7
Facilities
CN5
MARC
CN6
50
CN6
CN5
CN1
Processor
PA Control
Connections
CN2-1
Processor
n/c
Char acteristicName
IF
Front Panel
Processor
Connections Name Characteristic
CN4-1
CN4-2
CN4-3
CN4-4
CN1-1
CN1-2
CN1-3
CN1-4
LED Alarm
LED Ready
LED Standby
LED Tx
LCD RS
Open collector (5mA)
CN4-5
CN4-6
CN4-7
CN4-8
CN4-9
CN4-10
CN4-11
CN4- 12
CN4- 13
CN4-14
CN4-16
CN4-17
CN4-18
CN1-20
CN1-19
CN4-15
CN1-25
CN4-24
CN4-23
CN1-22
CN1-21
CN1-5
CN1-24
CN1-23
CN1-16
CN4- 19
CN4-22
CN4-21
CN4-20
CN1-18
CN1-17
CN1-6
CN1-7
CN4- 25
LCD R/W
LCD Backlight
Transmit Data
+5 V Supply
-5 V Supply
Ground
+15 V Supply
Ground
Mic PTT
LED RX (not used)
5 V pull-up
TTL
TTL
TTL
TTL
0 V
-5 V
TTL
TTL
+1 5 V
LCD Enable
Data 3
Data 2
Data 7
Data 6
Data 5
Data 4
RS232
+5 V
0 V
34
CN3-14
CN3-13
CN3-12
CN3-11
CN3-10
CN4-14
CN4-13
CN4-12
CN4-11
CN4-10
n/c
Remote on/off
V Unreg
V Unreg
dc Detect
CN3-9
CN3-8
CN3-7
CN3-6
CN3-5
CN3-4
CN3-3
CN3-2
CN3-1
Connections
CN4-6
CN4-9
CN4-8
CN4-7
CN4-5
CN4-4
CN4-3
CN4-2
CN4-1
Regulation
ac Detect
-15 V Supply
Ground
+5 V Supply
+15 V Supply
Processor
Name Characteristic
+15 V Supply
-15 V Supply
+5 V Supply
Ground
-15 V
21.6 to 32 V
21.6 to 32 V
Open collector
15V on, 0V off
+15 V
+5 V
+15 V
-15 V
+5 V
0V
0V
CN6-7
CN6-6
CN6- 10
CN6-9
CN6-8
CN5-10
CN5-9
CN5-6
CN5-7
CN5-8
-15 V Supply
ac Detect
dc Detect
-15 V Supply
Ground
-15 V
-15 V
0V
Connections
CN6-5
CN6-4
CN6-3
CN6-2
CN6-1
CN5-2
CN5-4
CN5-3
CN5-5
Regulation
CN5-1
Name
+5 V Supply
+15 V Supply
+5 V Supply
+15 V Supply
Ground
PA Control
Characteristic
+15 V
+5 V
+5 V
0V
+15 V
*
*
CN6-7 7
CN6-8
CN6-9 9
8
Processor
CN6-1
CN6-2
CN6-3
CN6-5
CN6-6
CN6-4
**
4
6
5
3
1
2
MARC P ort
Connections
Data RX A - Data In - RS422
RS422
RS422Data TX B - Data Out +
Data TX A - Data Out -
RS422
0 V or +10 V to +60 V or
Fused 500mA, 21.6 to 32 V
+20 dBm to -20 dBm 600R
Characteristic
PTT Input
Data RX B - Data I n +
Unregulated Supply
Line I n +
Ground 0 V
Name
+20 dBm to -20 dBm 600R
**
CN5-4
CN5-6
CN5-7
CN5-5
7
5
6
4
Grounding output +/- 60V,
100mA max.
TT L pull -u p ac ti ve low
Grounding output +/- 60 V,
100mA max.
S quelch Defeat (not used)
Antenna Change Over
External VSWR
CN5-3
CN5-2
CN5-1
Processor
Connections
Facilities
2
3
1
TT L pull -u p ac ti ve low
CharacteristicName
E Bit
PTT
Ground 0 V
Ground
Unregulated Supply
CN5-8
CN5-9 9
80 V
Fused 300mA 21.6 to 32 V
Grounding output +/- 60V,
100mA max.
Name
Reserved
Tape Output
CN5-14
CN5-15
CN5-13
CN5-12
CN5-11
14
15
13
12
11 BIT Interruptive Test
RSSI (not used)
Ready Output
Facilities
Connections
CN5-10
Processor
10 Inhibit
Open collector, 0 V = Ready
-10 dBm. 100R
TT L pull-up active low
Characteristic
***
V Unreg
Receive Data
0 V=PT T,5 V pull-up=PTT
Turn +
TTL
TTL
TTL
RS232
Turn -
Sidetone (Headset Drive) 3 Vac pk-pk
Loudspeaker Amp Drive
Ground
Mic Input
Ground 0V
1.6V p-p maximum
0V
2V p- p ma x imu m
Push
Ground 0 V
CN1-26CN4- 26
CN1-27CN4- 27
CN1-31
CN1-29
CN4- 28
CN1-30
CN4-31
CN4-29
CN1-28
CN4-30
CN4-33
CN1-34
CN1-33
CN4-34
CN1-32CN4-32
Open collector (200mA)
0V = off, open collector = on
n/c
n/c
n/c
n/c
n/c
CN2
CN1
CN3
CN4
CN2
CN3-1
CN3-2
Front Panel
Characteristic
Ground
Connections
Loudspeaker Output
Name
0 V = PT T, 5 V pull-up = not PTT
6k8 input impedance, 5mV sensi tivity
CN10 CN1
6
Fan
2
PA
Reference Frequency
Connections
Front P anel
-20 dBm to 0 dBm
CharacteristicName
CN5-1
Forward Power Sense CN8
Connections
17 dBm ± 1 dB
Name Characteristic
RF Output
Connections
PA
CN1-1
Name Characteristic
5 to 50 W
CN4-1
Antenna Port
(Rear Panel)
CN8
Open collector (5mA)
Open collector (5mA)
Open collector (5mA)
Data 1
Data 0
TTL
TTL
CN1- 12
CN1- 13
CN1- 14
CN1- 15
CN1-8
CN1-9
CN1- 10
CN1- 11
5 V pull-up
5 V pull-up
RF PA
1 dBm carr ierRF DriveCN10CN3-1
Connections Name Characteristic
RF PA
PA Heatsink
CN6 Fan Control
Ground 0V
10V approx. or 26.5V
CharacteristicConnections Name
Fan
Fan
-10 V to -60 V at 6mA
TT L pull-up active low
Regulator
Connections
RF PA
Name Characteristic
CN3-1
CN3-2
CN3-3 Heatsink
CN3 V Unreg
-33 V
Ground Supply
21.6 to 32 V
0 V
n/c
10
14
3
CN3-3 n/c n/c
CN5
CN4
Reference Frequency
(Front Panel)
CN4-1
CN3
CN2
CN4
CN5
CN7
CN9
CN6
(-30.5 dBc ± 0.9 dB)
Mains IEC
Connector
Filtered/
Fused
0 to 4 V / 0 to 6VFrequency TrimCN1-14 CN1-14
CN1-50
CN1-48
CN1-49
CN1-47
CN1-45
CN1-46
CN1-44
CN1-43
CN1-42
CN1-41
CN1-15
CN1-16
CN1-21
CN1-22
CN1-23
CN1-17
CN1-19
CN1-18
CN1-20
CN1-24
CN1-25
CN1-30
CN1-26
CN1-29
CN1-28
CN1-27
CN1-31
CN1-32
CN1-33
CN1-34
CN1-36
CN1-35
CN1-37
CN1-40
CN1-39
CN1-38
CN1-50
CN1-45
CN1-43
CN1-44
CN1-47
CN1-46
CN1-49
CN1-48
CN1-28
CN1-42
CN1-41
CN1-38
CN1-39
CN1-36
CN1-37
CN1-40
CN1-32
CN1-31
CN1-29
CN1-30
CN1-34
CN1-33
CN1-35
CN1-21
CN1-24
CN1-23
CN1-22
CN1-26
CN1-27
CN1-25
CN1-17
CN1-16
CN1-15
CN1-20
CN1-19
CN1-18
TTL
TTL
TTL
TTL
TT L - Low OCX O fitted
TTL - High fan on
TTL
BIT Control 3 (Not used)
BIT Control 2 (Not used)
Step Size (Not used)
V/U Detect
TR Detect
Reserved
OCXO Fitted
Fan Enable
TTL
TTL
TTL
TTL
TTL
TTL
0 to 2.5 V
10 mV / °C
10 mV / °C
0 to 5 V (5 V 3dB back off)
TTL
TTL
TTL
TTL
TTL
BIT Loop Correct
BIT Synth Lock
BIT Open Loop
BIT V SW R OK
BIT Control 1
BIT Control 0
Reflected Power
PA Temperature
Auto Level Control
External V SWR
PAC Temperature
Narrow/Wide (Not used)
Tx Key
TTL
TTL
TTL
TTL
0 V
TTL
0 V
TT L pull up active low
TTL
TTL
TTL
TTL
Filter 3
Data
Phase Load
Clock
Synth Load
Ground
Filter 4
Filter 0
Filter 2
Filter 1
Ground
Power Down
Tx/Rx Detect
CN1-10
CN1-13
CN1-12
CN1-11
PA ControlProcessor
CN1-7CN1-7
CN1-9
CN1-10
CN1-8
CN1-12
CN1-13
CN1-11
CN1-9
CN1-8
CN1-2
CN1-3
CN1-1
CN1-5
CN1-6
CN1-4
CN1-6
CN1-5
CN1-4
CN1-2
CN1-3
CN1-1
Connections
0 to 2.5 V
0 V
±2.5 V
±2.5 V
0 to 2.5 V
0 to 2.5 V
0 to 2.5 V
0 V
0 V
0 V
0 V
0 V
0 V
Ground
Ground
Q
Ground
Ground
BIT Q Monitor
BIT I Monitor
RF AGC (Not used)
I
Ground
IF AGC (Not used)
Ground
Ground
Name Characteristic
***
A B C D
CN8
Processor
CN8 Ring
CN8 Tip External Speaker Drive
External Speaker Drive 3 Vac pk-pk max
Characteristic
Connections Name
External Speaker
1
2
CN8 Sleeve Ground 0 V
3
3 Vac pk-pk max
Antenna Change Over
TTL pull-up active low
Potential range 0 V to 10 V
6
7
8
2
4
3
5
Pin Number
1
Name
CN7A
CN7ACN7A
CN7A
n/c
n/c
n/c
RTIP
TRING
n/c
TTIP
RRING
*
6
7
8
2
4
3
5
Pin Number
1
Name
CN7B
CN7BCN7B
CN7B
HDLC CL B
HDLC CL A
Unregulated Supply
HDLC R x B
HDLC T x B
HDLC Rx A
HDLC T x A
Ground
6
7
8
2
4
3
5
Pin Number
1
Name
CN7C
CN7CCN7C
CN7C
n/c
Unregulated Supply
Data Rx B (Data In +)
Data T x B ( Data Out +)
Data Rx A (Data In -)
Data T x A ( Dat a Out -)
Ground
*
6
7
8
2
4
3
5
Pin Number
1
Name
CN7D
CN7DCN7D
CN7D
Not used
Fast Antenna Change Over /
PTT
Not used
Line In +
PTT Input
Line In -
Not used
Ground
*
Characteristic
Char acteristic
Char acteristic
Characteristic
+20 dBm to -20 dBm 600R
+20 dBm to -20 dBm 600R
0 V
0 V or +10 V to +60 V or
-10 V to -60 V at 6mA
+20 dBm to -20 dBm 600R
+20 dBm to -20 dBm 600R
ANSI T1.403-1995 (T1),
ITU-T: G.703 (E1)
ANSI T1.403-1995 (T1),
ITU-T: G.703 (E1)
NPN open collector
grounding transistor
0 V or +10 V to +60 V or
-10 V to -60 V at 6mA
0V
RS 422
RS 422
RS 422
RS 422
RS 422
RS 422
21.6V to 32V
Reserved
RF PA Bias Disable
TTL
0 V
7.5V pk-pk Max
Open collector (5mA)
EXT
SPKR
T1/E1
MARC AUDIO
MARC DAT A
HDLC
TTL
RF PA PA Control
PA Control
PA Control
0V
21.6V to 32V
RS 422
RS 422
RS 422
RS 422
13
(Rear Panel)
CN7
2
Supply
(shown in
off position)
CN8 1 L
2 N
3
E
Power Supply
1
CN1
4
3
2
L
N
E
CN6
CN1-4
CN4
CN9 L
N
0 V
Characteristic
0 V = on
o/c OK
PSU OKCN6-3
CN6-5
CN6-4
0 V
PSU off
PSURegulation
Connections Name
CN6-6
CN6-2
CN6-1 0 V
PSU OK
0 V
0 V OK
CN4-3
CN4-1 PSU off PSU off 0V = 0ff
2
2
(Rear Panel)
Ground Supply 0 V
29 V
V Unreg 29 V
R emote Supply On/Off
Line In -
50 W = 670 mV
Characteristic
TT L - High for fan on
TTL - High for bias on
PA Bias EnableCN2-3
CN2-5
CN2-4
Reflected Power
Fan Enable
RF PA
Connections Name
CN2-6
CN2-2
CN2-1 PA Temperature
Drive Detect
10 mV/°C + 0.5V
0.5 V for +10 dBm
CN4
CN9
CN5
CN7
CN2
CN12 PA Current Detect (not used) 0.1V per Amp
PA Control
CN12
T6S2VHF Tx Interconnection and Wiring
Back to Transmitter
Main Page
Fig 3 Module Location Diagram
Power Supply
T6 Series 2 VHF Transmitter
Module Location Diagram
Processor Module
VHF TX RF PA Module
VHF TX PA Control Module
Front Panel Module
Regulation Module
Antenna Connector
Fan
Top view - Top Cover removed
View on underside - Bottom Cover removed
Tx Module Location
Back to Transmitter
Main Page
Fig 4 Processor Module - Removal and
Refitting Detail
PA CN
8
GA10931
Back to Transmitter
Main Page
Fig 5 PSU Regulator Module - Removal and
Refitting Detail
Brown (L)
Blue (N)
CN3
CN1
CN2
CN8
CN7
CN6
GA10929
Back to Transmitter
Main Page
Fig 6 PA Control Module - Removal and
Refitting Detail
CN5
CN4
CN5
CN4
CN3
This connector will twist on itself
PC3
Back to Transmitter
Main Page
Fig 7 Power Supply - Removal and
Refitting Detail
Power Supply
GA10928
Back to Transmitter
Main Page
Fig 8 PA Module - Removal and
Refitting Detail
GA10930
Back to Transmitter
Main Page
Fig 9 Front Panel Assembly PCB - Removal
and Refitting Detail
Front Panel
Front panel PCB
Allen head grub screw
CN5 PA Control
Diagram B
Diagram A
GA10944, GA10927
Back to Transmitter
Main Page
Fig 10 Cooling Fan - Removal and
Refitting Detail
power connections here
Finger guard
AIRFLOW
GA10945