Park Air Systems B63300HS VHF Ground to Air Transmitter User Manual 300W VHF Hardcopy

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Application ID	RgH69A2cMFPXnkJXZmZv8g==
Document Description	user manual part 2
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Permanent Confidential	No
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Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
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Date Submitted	2007-06-07 00:00:00
Date Available	2007-06-07 00:00:00
Creation Date	2006-03-22 07:42:21
Producing Software	Acrobat Distiller 4.05 for Windows
Document Lastmod	2007-05-15 14:07:21
Document Title	300W VHF Hardcopy.book
Document Creator	FrameMaker 6.0
Document Author:	B.Adolphson

Configuring the Transmitter for Operational Use
The transmitter can be configured for use in several different ways. Typical configurations are illustrated
in the following figures:
Fig 19
Local operation. Operating the transmitter using a microphone connected to the drive
assembly front panel.
Fig 20
Remote operation. Operating the transmitter from a voice switch or remote controller.
Fig 21
With the transmitter connected through an RSE2 equipment. RSE2 is the remote site
equipment in a Park Air Multi-Access Remote Control (MARC) system. This system
provides automatic and manual main/standby switching and routes BIT information to allow
radio, site and system status to be displayed at the control site.
Fig 22
With the transmitter connected through an E1 Radio Interconnect (E1-RIC). By using
E1-RICs, a digital end-to-end system using E1 data streams can be configured.
Fig 23
The transmitter is configured with a receiver to provide Mode 2 operation (note that mode
2 software must be loaded to allow this configuration).
Fig 24
The transmitter is configured for Mode 3 operation (note that mode 3 software must be
loaded to allow this configuration).
The following pages show the illustrations listed above and then detail the pin-outs for the drive assembly
connectors used to configure the transmitter for the required operational usage. The Microphone/
Diagnostics and the Reference connectors are fitted to the drive assembly’s front panel; other
connectors, as shown in Fig 25, are fitted to the rear panel.
T6T 300 Watt VHF Transmitter
Page 79
Installation
Amplifier 1
Amplifier 2
Combiner
Amplifier 3
Drive Assembly
Optional facilities
(use as required)
Facilities
Connector
Reference
Connector
Microphone/Diagnostics
Connector
Frequency Counter
for Maintenance
Microphone/Headset
for transmissions and
monitoring sidetone
Laptop (or PC)
required when using VFP
28 Vdc output
PTT relay output
Antenna change-over output
Tape output
Ready output
VSWR input signal
BIT test input signal
Inhibit input signal
E-BIT input
Fig 19 Transmitter Configured for Local Operation
T6T 300 Watt VHF Transmitter
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Installation
Amplifier 1
Amplifier 2
Combiner
Amplifier 3
Microphone/Headset for
engineering purposes
Drive Assembly
Optional facilities
(use as required)
Facilities
Connector
Reference
Connector
Microphone/Diagnostics
Connector
MARC Connector or
MARC Audio Connector
Laptop (or PC)
required when using VFP
Frequency Counter
for Maintenance
Audio and PTT
Signals from Control Equipment
28 Vdc output
PTT relay output
Antenna change-over output
Tape output
Ready output
VSWR input signal
BIT test input signal
Inhibit input signal
E-BIT input
Fig 20 Transmitter Configured for Remote Operation
T6T 300 Watt VHF Transmitter
Page 81
Installation
Amplifier 1
Amplifier 2
Combiner
Amplifier 3
Microphone/Headset for
engineering purposes
Drive Assembly
Optional facilities
(use as required)
Facilities
Connector
Reference
Connector
Microphone/Diagnostics
Connector
MARC Connector
Laptop (or PC)
required when using VFP
Frequency Counter
for Maintenance
Audio
PTT
MARC Data
RSE2
Equipment
Connectors
28 Vdc output
PTT relay output
Antenna change-over output
Tape output
Ready output
VSWR input signal
BIT test input signal
Inhibit input signal
E-BIT input
Audio and PTT
from
control equipment
MARC Data
to and from
control centre
Fig 21 Transmitter Configured for use with a MARC RSE2
T6T 300 Watt VHF Transmitter
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Installation
Amplifier 1
Amplifier 2
Combiner
Amplifier 3
Microphone/Headset for
engineering purposes
Drive Assembly
Optional facilities
(use as required)
Facilities
Connector
Reference
Connector
Microphone/Diagnostics
Connector
T1/E1 Connector
Laptop (or PC)
required when using VFP
Frequency Counter
for Maintenance
E1 Data Stream
containing Audio,
Signalling and
MARC Data
E1-RIC
E1 Data Stream
containing Audio,
Signalling and
MARC Data
Or (see Note)
Radio
Connectors
28 Vdc output
PTT relay output
Antenna change-over output
Tape output
Ready output
VSWR input signal
BIT test input signal
Inhibit input signal
E-BIT input
Audio and PTT
from
control equipment
MARC Data
to and from
control centre
Fig 22 Transmitter Configured for use with an E1-RIC
Note:
E1-RIC can be used in an E1 digital end-to-end system, or using 4-wire E and M lines.
T6T 300 Watt VHF Transmitter
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Installation
Amplifier 1
Amplifier 2
Combiner
Amplifier 3
Drive Assembly
Reference
Connector
Microphone/Diagnostics
Connector
HDLC
Connector
T1/E1 Connector
Facilities
Connector
Mode 2
Network
Computer
Fast Antenna
Change-Over
Switch
T1/E1 Connector
Reference
Connector
Antenna
Connector
Microphone/Diagnostics
Connector
T6R Receiver
Frequency Counter
for Maintenance connects
to Reference Connector
Laptop (or PC) required
when using VFP. Connects to
Microphone/Diagnostics Connector
Fig 23 Transmitter Configured with Receiver for Mode 2 Operation
T6T 300 Watt VHF Transmitter
Page 84
Installation
Amplifier 1
Amplifier 2
Combiner
Amplifier 3
Drive Assembly
Reference
Connector
T1/E1 Connector
Microphone/Diagnostics
Connector
Frequency Counter
for Maintenance
Laptop (or PC)
required when using VFP
Mode 3
Network
Computer
Fig 24 Transmitter Configured for Mode 3 Operation
T6T 300 Watt VHF Transmitter
Page 85
Installation
Front Panel Connectors
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 16.
Pin-out of the Microphone/Diagnostics connector looking into
the mating face of the chassis mounted socket.
A suitable free plug is detailed in Table 14 on page 70.
Table 16 Microphone/Diagnostics Connector
Pin Number
Signal
Characteristic
Usage
Microphone ground
0 V.
Microphone/Headset
Transmit data
RS232. 115200 baud, 8 data bits, 1 stop bit,
no parity, no handshaking.
PC
Microphone PTT
0 V to PTT.
Microphone/Headset
Receive data
RS232. 115200 baud, 8 data bits, 1 stop bit,
no parity, no handshaking.
PC
Sidetone
–
Microphone/Headset
Microphone input
To ensure correct VOGAD operation, the
following microphone input levels are
required:
Microphone/Headset
Passive setting: between 2 and 35 mV
Active setting: between 8 and 140 mV.
Ground
0 V.
PC
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.
T6T 300 Watt VHF Transmitter
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Installation
Rear Panel Connectors
Fig 25 Drive Assembly External Signal Connectors
Table 17 Rear Panel Connector Usage
Connector
Type
Usage
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 RSE2
Used to connect a T6 controller or hub
Used to terminate external 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
external 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. Table 24 on page 95 lists the facilities.
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
network.
HDLC
RJ48
Used to connect to a Mode 2 network computer.
T6T 300 Watt VHF Transmitter
Page 87
Installation
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 18.
Pin-out of MARC connector looking into the mating face of the
chassis mounted socket.
A suitable free plug is detailed in Table 14 on page 70.
Table 18 MARC Connector
Pin Number
Signal
Characteristic
Ground
0 V.
Audio line in (+)
Audio line in (-)
Balanced 600 ohm, -30 to +10 dBm.
Phantom keying can be superimposed on the audio
lines. See Fig 27.
PTT input
Remote PTT signal input. See Fig 26.
Output supply
This output is between 21.6 and 32 Vdc (nominally
28 V) fused at 500 mA.
Data in (+)
Data in (-)
RS422 differential asynchronous data at 9600 baud,
8 data bits, 1 stop bit, no parity, no handshaking.
Data out (+)
Data out (-)
RS422 differential asynchronous data at 9600 baud,
8 data bits, 1 stop bit, no parity, no handshaking.
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 Setting’ in Operation.
T6T 300 Watt VHF Transmitter
Page 88
Installation
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 19.
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.
RJ48 Plug
Pin 1
Table 19 MARC Audio Connector
Pin Number
Signal
Characteristic
Audio line in (-)
Balanced 600 ohm, -30 to +10 dBm.
Audio line in (+)
Phantom keying can be superimposed on the audio
lines. See Fig 27.
Fast antenna
change-over/PTT
(output)
Open collector NPN transistor grounding output,
200 mA maximum, configurable normally open or
normally closed.
Not used
Not used
PTT (input)
Remote PTT signal input. See Fig 26.
Ground
0 V.
Not used
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 Setting’ in Operation.
T6T 300 Watt VHF Transmitter
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Installation
MARC or
MARC Audio
Connector
T6T Transmitter
MARC Audio Connector
Audio is pins 1 and 2.
PTT is pin 6
Ground is pin 7.
Control
Equipment
Cross-Site Lines
MARC Connector
Audio is pins 2 and 3.
PTT is pin 4
Ground is pin 1.
Audio line 1
Audio
Circuit
Audio line 2
Reference Voltage
(0 V, +14 V or -14 V)
Set from front panel
PTT
PTT input requires at least 1 mA to operate.
Input will draw no more than 6 mA.
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.
Fig 26 Remote Keying
MARC or
MARC Audio
Connector
Control
Equipment
T6T Transmitter
MARC Audio Connector
Audio is pins 1 and 2.
MARC Connector
Audio is pins 2 and 3.
Audio
Circuit
Audio lines with phantom keying
signal superimposed
Reference Voltage
(0 V, +14 V or -14 V)
Set from front panel
PTT
Switch
PTT input requires at least 1 mA to operate.
Input will draw no more than 6 mA.
VPTT
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 V PTT differs from the transmitter reference voltage by less than 1 V.
❑
Maximum value of V PTT 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.
Fig 27 Phantom Keying
T6T 300 Watt VHF Transmitter
Page 90
Installation
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 20.
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.
RJ48 Plug
Pin 1
Table 20 MARC Data Connector
Pin Number
Signal
Characteristic
Data in (-)
RS422 differential asynchronous data, 9600 baud,
8 data bits, 1 stop bit, no parity, no handshaking.
Data in (+)
Not connected
Data out (+)
Data out (-)
RS422 differential asynchronous data, 9600 baud,
8 data bits, 1 stop bit, no parity, no handshaking.
Remote supply on/off
0 V to switch off.
Note: Rear panel switch must be in the On position for
this function to operate.
Ground
0 V.
Output supply
This output is between 21.6 and 32 Vdc (nominally
28 V) fused at 500 mA.
T6T 300 Watt VHF Transmitter
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Installation
T1/E1 Connector
The T1/E1 8-way RJ48 socket is used to:
❑
Connect voice, signalling and RCMS data to a digital network
❑
Connect a Mode 3 network computer
❑
Connect a transmitter and receiver together when the receiver is configured as part of a Mode 2
base station.
The connector pin-out is shown belown and detailed in Table 21.
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.
RJ48 Plug
Pin 1
Table 21 T1/E1 Connector
Pin
Signal
RRing
RTip
Characteristic
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.
Not connected
TRing
T1 - Balanced 100 ohm (±10%), 1.544 Mbits per
second (±50 ppm), AMI/B8ZS Coding.
TTip
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.
Remote on/off
An input that is primarily used by a Park Air E1-RIC
equipment to switch the radio on and off (0 V = off,
5 V = on). For this facility to work, the radio’s rear
panel Supply switch must be set to on and the E1-RIC
must be powered from an external source.
Ground
0 V.
20 to 35 Vdc (nominally
28 V)
Output supply used to power an E1-RIC.
T6T 300 Watt VHF Transmitter
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Installation
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 shown below and detailed in Table 22.
Numbering is shown looking from the top of the connector.
The top is being viewed when the lever is on the bottom.
RJ48 Plug
Pin 1
Table 22 HDLC Connector
Pin
Signal
Characteristic
HDLC RX A (input)
HDLC RX B (input)
HDLC CL A (output)
HDLC TX B (output)
HDLC TX A (output)
HDLC CL B (output)
Pair to pin 3.
Ground
0 V.
Output supply
This output is between 21.6 and 32 Vdc (nominally 28 V) fused at 500 mA.
RS422 differential synchronous data, 128 kbytes per second (±50 ppm).
RS422 differential synchronous data, 128 kbytes per second (±50 ppm).
RS422 differential synchronous data, 128 kbytes per second (±50 ppm).
T6T 300 Watt VHF Transmitter
Page 93
Installation
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 23 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 300 Watt VHF Transmitter
Page 94
Installation
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 shown below and detailed in Table 24.
Pin-out of Facilities connector looking into the mating face of
the chassis mounted socket.
15
A suitable free plug is detailed in Table 14 on page 70.
Table 24 Facilities Connector
Pin Number
Signal
Characteristic
Ground
0 V.
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 LCD. 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.
PTT output
Grounding solid state relay. +60 to -60 V, ac or dc, 100 mA maximum,
configurable normally open or normally closed. Activated 35 ms (±1 ms)
before the start of the power ramp up to allow for the antenna relay pullin time.
External VSWR input
Used to indicate an external VSWR fault. TTL input with 4.7 kohm pullup to 5 V. Configurable active high or low.
Antenna change-over
(output)
Solid state relay linked to pin 6. See Fig 28 for further detail.
Antenna change-over
common (output)
Solid state relay linked to pin 5.
Not used
Ground
0 V.
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
maximum, configurable normally open or normally closed.
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.
T6T 300 Watt VHF Transmitter
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Installation
T6T Transmitter
(Main)
Antenna
Facilities
Connector
Antenna
28 Vdc (nominal)
T6T Transmitter
(Standby)
Main/Standby
Transmit Relay
Facilities
Connector
Control
Solid State
Relay
Link
Antenna
Example
This example shows the Antenna Change-over 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 change-over 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 V, ac 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.
Fig 28 Example: Using the Antenna Change-over Output
T6T 300 Watt VHF Transmitter
Page 96
Installation
Maintenance
Introduction
This topic gives the scheduled and unscheduled maintenance procedures for the T6T 300 watt VHF
transmitter and shows how to use the Virtual Front Panel (VFP).
Scheduled Maintenance
A scheduled maintenance procedure is given on page 100.
Park Air recommends that this task be completed every twelve
months.
Unscheduled Maintenance
Normally, the T6T 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 104.
Using the VFP
Operating parameters can be set from the drive assembly’s front
panel, or by using the VFP. Some additional functions are available
from the VFP. See page 126.
Configuration
T6 radios are configured in respect of hardware and software.
Hardware Configuration
The transmitter consists of a drive assembly, three amplifiers and a combiner. Each has an identification
label showing the model, part number, serial number and the modification state. The modification state
identifies the hardware configuration.
PAE
PAE
PAE
T6T VHF Drive Assembly
Model:
24-06633001/3
Part No:
2L0001
S / No:
Mod Record: X 6 7 8 9 10 11 12 13
T6T VHF Amplifier
Model:
24-31633001/2
Part No:
2L0001
S / No:
Mod Record: X 6 7 8 9 10 11 12 13
T6T VHF Combiner
Model:
24-33633001/2
Part No:
2L0001
S / No:
Mod Record: 1 2 3 4 5 6 7 8 9 10
Park Air Systems Ltd England
Drive Assembly Label
T6T 300 Watt VHF Transmitter
Park Air Systems Ltd England
Amplifier Label
Page 98
Park Air Systems Ltd England
Combiner Label
Maintenance
Software Configuration
A white label fitted to the top
cover lists the radio’s software
configuration.
In this example there are three
fills: AM-Voice, Mode 2 and
Mode 3.
Software Configuration
2K1234
Part Order No.
B63300HS
Software
Mode
Part No.
Fill 1
AM_VOICE
65-00000465
Fill 2
65-00000466
Fill 3
65-00000467
Fill 4
Software Configuration Label
Replacement Modules
To ensure compatibility when replacing a radio or a module, the configuration should be the same (see
the previous headings: Hardware Configuration and Software Configuration).
Spare modules received from Park Air are supplied with a Spares Instruction that details the
configuration of the module and any special instructions. If in any doubt regarding the suitability of spare
modules contact Park Air Customer Support.
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Page 99
Maintenance
Scheduled Maintenance
Park Air recommends that scheduled maintenance is carried out at twelve-monthly intervals. Scheduled
maintenance comprises the following checks:
Number
Check
Tools/Test Equipment Required
Ensure the equipment is clean and that external
connectors are securely fitted.
Camel hair brush/clean lint-free
cloths.
Check and reset (if required) the transmitter’s
internal frequency reference.
VHF frequency counter.
Perform a BIT interruptive test.
Perform an ac and dc change-over check (if both
supplies are connected).
Cleaning and Checking Security of Connectors
Remove all dust and dirt from the equipment exterior using a lint-free cloth and camel hair brush. Check
all external connections are secure and free from damage.
Setting the Transmitter Internal Reference Frequency
To set the transmitter internal reference frequency, use the following procedure. Note that references to
the switch in the procedure mean the Scroll/Select switch.
(1)
(2)
(3)
(4)
If the transmitter operates with 5-offset
carrier (that is, set with a 4 kHz or 8 kHz
offset) reset the offset to zero.
Connect a frequency counter to the front
panel Reference connector.
From the Main screen, press the switch to
display the Control screen. Turn the
switch until Settings is highlighted. Press
the switch.
Ensure the Settings screen is displayed.
Turn the switch until Ref Freq is
highlighted, then press the switch.
F r
e q u e n c y
C h a n n e l
S e t
E x i
n g s
Control Screen
B a n d
R e f
E d g e s
F r
B a c k l
E x i
e q
g h t
5 0 .
0 %
0 3 0 s
< <
> >
(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.
(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.
(8)
If 5-offset carrier operation is required, complete the procedure Setting a 5-Offset Carrier
Frequency on page 101.
T6T 300 Watt VHF Transmitter
Page 100
Settings Screen
Maintenance
Setting a 5-Offset Carrier Frequency
If a 5-offset carrier frequency is required, set the offset using the following procedure:
(1)
Connect a 50 ohm frequency counter, through a 60 dB attenuator, to the combiner’s Antenna
connector.
(2)
Set the required 25 kHz channel frequency; for example, 124.500 MHz.
(3)
From the AM-Voice Mode Settings Screen set the required offset (+4 kHz, -4 kHz, +8 kHz or
-8 kHz); for example, a +4 kHz offset to give an operating frequency of 124.504 MHz.
(4)
From the Settings screen select Ref Freq and press the Scroll/Select switch.
(5)
Key the transmitter and adjust the reference frequency using the Scroll/Select switch until the
frequency counter displays the required operating frequency; for example, 124.504 MHz.
(6)
When the frequency counter displays the exact operating frequency, press the Scroll/Select
switch and stop keying the transmitter.
Disconnect the test equipment and reconnect the antenna.
T6T 300 Watt VHF Transmitter
Page 101
Maintenance
To Initiate a BIT Test
An interruptive BIT test cannot be initiated in Mode 2 or Mode 3.
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.
(1)
(2)
From the Main screen, press the switch to
display the Control screen. Turn the switch
until BIT is highlighted. Press the switch.
Ensure the BIT menu is displayed. Turn
the switch until BIT Initiate is highlighted.
Press the switch.
B I
S /
S t
a n d b y
E x
B I
E x
(4)
During the test, which takes approximately
two seconds, the Testing screen is
displayed.
After the test, either a Pass or Fail screen
is displayed. Selecting OK takes the user
back to the BIT screen.
< <
a t
0 0 0 0 0 :
S u p p
E T I
A C
(3)
C o n
0 0 h r
O N
> >
T e s
P l
e a s e
T e s
S t
n g
W a
a t
u s
P A S S
O K
(5)
If fail is displayed, scroll through the screen
to check the cause of the failure.
T e s
S t
F A I
a t
u s
O K
T6T 300 Watt VHF Transmitter
Page 102
Maintenance
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
Supply switches are set to the I (on) position.
(2)
Confirm that the front panel Ready indicators are 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 300 Watt VHF Transmitter
Page 103
Maintenance
Unscheduled Maintenance
WARNING
Dangerous Voltage
The instructions given in this topic involve connecting dangerous voltage to the transmitter.
Maintenance should be carried out only by suitably qualified personnel.
When an ac supply is connected, dangerous voltage is present within the transmitter. Care
must be taken by personnel to avoid accidental contact with exposed circuitry during
maintenance or alignment procedures.
When the Supply switch is set to the Standby position, dangerous voltage is still present in
the transmitter's internal power supply circuitry. To ensure safe working, both ac and both
dc input supplies must be disconnected from the transmitter.
WARNING
Beryllium Hazard
The output transistors used in the power amplifier (PA) contain the toxic material beryllium.
Although no procedures in this documentation instruct component removal, users should be
aware that there could be a hazard should the output transistors become damaged.
Caution
ESDs
The T6T transmitter circuitry contains Electrostatic Sensitive Devices (ESDs). Personnel
must be aware of the precautions necessary to prevent damage to such devices.
Caution
Unauthorized Modifications
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.
Caution
Repairs
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 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 modules.
T6T 300 Watt VHF Transmitter
Page 104
Maintenance
Introduction
This topic provides the user with detailed instructions on the removal and replacement of modules within
the drive assembly and amplifiers. A faulty combiner must be replaced. When removing or refitting
modules, observe antistatic handling precautions. Do not change any potentiometer (or link) settings
unless detailed in these instructions. Potentiometers have been set using specialist equipment.
Molex KK Connectors
To remove Molex 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 Fig 29). 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.
Lift 1
Lift 2
PCB
Fig 29 Molex KK Type Connector
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 topic.
❑
Personal Computer (PC)
❑
Frequency Counter
❑
General Purpose Tool Kit (including
a 1.5 mm Allen key)
❑
Power Meter
❑
Dummy Load
❑
5 mm Nut Spinner
❑
❑
Camel Hair Brush
PC to Radio Interconnection Lead
(Park Air part number 17E12600001)
❑
Clean Lint-free Cloths
❑
SMB to BNC Lead for Reference Frequency
(Park Air part number 17K11000004)
T6T 300 Watt VHF Transmitter
Page 105
Maintenance
T6T VHF Amplifier Procedures
Top and Bottom Covers
One of the top cover screws is covered with a warranty label that should not be tampered with unless
Park Air Customer Support has advised otherwise. When authorisation has been made the following
procedures should be followed.
To remove the top cover, locate and unscrew the 19 countersunk screws securing the top cover to the
mainframe. Access can then be gained to the Interface module and PSU Regulation module.
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 Combiner BIT module.
Removal and refitting of the following modules requires both top and bottom covers to be removed:
❑
Power Supply modules
❑
Combiner BIT module
❑
PA modules
❑
Front Panel assembly PCB.
Removing and Refitting the Interface Module
The Interface module is located as shown in Fig 34. A module removal diagram is shown in Fig 37.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF amplifier. Care must be taken by personnel
to avoid accidental contact with exposed circuitry when the covers are removed and power
is applied to the radio.
Removal
Ensure that the amplifier is isolated from the ac and dc input supplies. Disconnect the drive assembly
cables at CN5 and CN8. Disconnect the antenna cable to the Combiner. Then proceed as follows:
(1)
Unscrew the 19 countersunk screws and remove the amplifier top cover.
(2)
Locate the Interface module and disconnect the following connectors:
❑
CN2 10-way connector (10-way loom from Combiner BIT module CN15)
❑
CN3 SMB connector (coaxial cable from Combiner BIT module CN27)
❑
CN4 SMB connector (coaxial cable from Combiner BIT module CN16)
❑
CN6 15-way connector (15-way ribbon cable from PSU Regulation module CN1)
❑
CN7 10-way connector (10-way ribbon cable from Front Panel PCB).
(3)
Gain access to the rear of the amplifier. Using a 5 mm nut spinner tool, remove the four screwloc
8 mm-4-40 UNC stud spacers and wavy washers that secure the Interface module connectors
CN5 and CN8 to the rear panel.
(4)
Also at the rear of the amplifier, remove the two M3 x 8 mm screws that secure the blanking plate
and the Interface module.
(5)
Remove the five M3 x 8 mm screws that secure the module to the amplifier mainframe.
(6)
Remove the module from the chassis.
T6T 300 Watt VHF Transmitter
Page 106
Maintenance
Refitting
To refit the Interface module, proceed as follows:
(1)
Place the module in position. Ensure no wires are trapped by the module.
(2)
Ensure the module interface connectors CN5 and CN8 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, previously removed, but leave them loose.
(3)
Fit the two M3 x 8 mm screws, previously removed, that secure the blanking plate and Interface
module, but leave them loose.
(4)
Fit the five M3 x 8 mm screws, previously removed, that secure the module to the transmitter
mainframe, but leave them loose.
(5)
Using a 5 mm nut spinner tool, tighten the four screwloc 8 mm-4-40 UNC screws and wavy
washers that secure the connectors; then tighten all seven M3 x 8 mm screws that secure the
module to the amplifier mainframe.
(6)
Refit the following connectors to the module:
❑
CN2 10-way connector (10-way loom from Combiner BIT module CN15)
❑
CN3 SMB connector (coaxial cable from Combiner BIT module CN27)
❑
CN4 SMB connector (coaxial cable from Combiner BIT module CN16)
❑
CN6 15-way connector (15-way ribbon cable from PSU Regulation module CN1)
❑
CN7 10-way connector (10-way ribbon cable from Front Panel PCB).
(7)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
(8)
Re-establish the ac and/or dc supplies.
(9)
Switch power on at the radio using the rear mounted Supply switch.
(10) Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(11) Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure
To Calibrate the Transmitter on page 130.
(12) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(13) Set the rear panel Supply switch to Standby and remove the VFP connector. Isolate the amplifier
from the ac and/or dc supplies.
(14) Refit the amplifier top cover. The transmitter can now be returned to service.
T6T 300 Watt VHF Transmitter
Page 107
Maintenance
Removing and Refitting the PSU Regulation Module
The PSU Regulation module is located as shown in Fig 34. A module removal diagram is shown in
Fig 38.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF amplifier. Care must be taken by personnel
to avoid accidental contact with exposed circuitry when the covers are removed and power
is applied to the radio.
Removal
Before attempting to remove the PSU Regulation module, ensure that the amplifier is isolated from the
ac and dc input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the
antenna cable to the Combiner. Then proceed as follows:
(1)
Unscrew the 19 countersunk screws and remove the transmitter top cover.
(2)
Locate the PSU Regulation module and remove the three M3 x 8 mm captive washer screws that
secure the module to the amplifier mainframe.
(3)
Carefully raise the module to gain access to the module connectors.
(4)
Disconnect the following connectors:
(5)
❑
CN6 6-way connector (6-way to 10-way loom to Combiner BIT module CN12)
❑
CN4 14-way connector (14-way ribbon cable to Interface module CN6)
❑
CN3 3-way connector (part of loom to Combiner BIT module CN7)
❑
CN7 3-way connector (3-wire loom to rear panel On/Off switch)
❑
CN2 2-way connector (part of loom to Combiner BIT module CN7)
❑
CN1 4-way connector (part of loom to Combiner BIT module CN7).
Remove the module from the chassis.
Refitting
To refit the PSU Regulation module, proceed as follows:
(1)
While holding the module in position, connect the following connectors:
❑
CN1 4-way connector (part of loom to Combiner BIT module CN7)
❑
CN2 2-way connector (part of loom to Combiner BIT module CN7)
❑
CN7 3-way connector (3-wire loom to rear panel On/Off switch)
❑
CN3 3-way connector (part of loom to Combiner BIT module CN7)
❑
CN4 14-way connector (14-way ribbon cable to Interface module CN6)
❑
CN6 6-way connector (6-way to 10-way loom to Combiner BIT module CN12).
(2)
Locate the module in position. Ensure no wires are trapped by the module.
(3)
Secure the module to the amplifier mainframe using the three M3 x 8 mm captive washer screws
removed during disassembly.
(4)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
T6T 300 Watt VHF Transmitter
Page 108
Maintenance
(5)
Re-establish the ac and/or dc supplies.
(6)
Switch power on at the radio using the rear mounted Supply switch.
(7)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(8)
Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(9)
Set the rear panel Supply switch to Standby. Isolate the amplifier from the ac and/or dc supplies.
(10) Refit the amplifier top cover. The amplifier can now be returned to service.
Removing and Refitting the Power Supply Modules
The Power Supply modules are located as shown in Fig 34. The removal diagram is shown in Fig 39.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF amplifier. Care must be taken by personnel
to avoid accidental contact with exposed circuitry when the covers are removed and power
is applied to the radio.
Removal
Before attempting to remove the Power Supply modules, ensure that the amplifier is isolated from the ac
and dc input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the antenna
cable to the Combiner. Then proceed as follows:
(1)
Remove the amplifier top and bottom covers as described on page 106.
(2)
Support the amplifier on its side.
(3)
Locate the power supplies. From the bottom half of the unit remove the two M4 x 8 mm
countersunk screws that secure each power supply to the amplifier mainframe. These screws
are accessed through clearance holes in the Combiner BIT module. During this operation
support the power supply from the top half of the unit.
(4)
Withdraw each 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 CN4 connectors (PSU-1 and PSU-2 to the Combiner BIT module, CN10 and CN11
respectively).
(6)
Disconnect the dc wires from the power supply terminal block (PSU-1 and PSU-2 to the
Combiner BIT module, CN1 and CN3 respectively).
(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 each power supply from the transmitter.
Refitting
To refit the Power Supply modules:
(1)
With the amplifier on its side hold each 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.
T6T 300 Watt VHF Transmitter
Page 109
Maintenance
(3)
Connect the dc wires to the eight connector terminal block, red to terminal 1 and terminal 2 and
black to terminal 5 and terminal 6.
(4)
Connect 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 two countersunk screws, previously removed, for
each power supply.
(6)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
(7)
Re-establish the ac and/or dc supplies.
(8)
Switch power on at the amplifier using the rear mounted Supply switch.
(9)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(10) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(11) Set the rear panel Supply switch to Standby. Isolate the amplifier from the ac and/or dc supplies.
(12) Refit the amplifier top and bottom covers. The amplifier can now be returned to service.
Removing and Refitting the Combiner BIT Module
The Combiner BIT module is located as shown in Fig 34. The removal diagram is shown in Fig 40.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF amplifier. Care must be taken by personnel
to avoid accidental contact with exposed circuitry when the covers are removed and power
is applied to the radio.
Removal
Before attempting to remove the Combiner BIT module, ensure that the amplifier is isolated from the ac
and dc input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the antenna
cable to the Combiner. Then proceed as follows:
(1)
Remove the amplifier top and bottom covers as described on page 106.
(2)
Locate the Combiner BIT module and disconnect the following connectors:
❑
CN1 4-way connector
❑
CN2 3-way connector
❑
CN3 4-way connector
❑
CN4 3-way connector
❑
CN5 3-way connector
❑
CN6 3-way connector
❑
CN7 8-way connector
❑
CN10 3-way connector
❑
CN11 3-way connector
❑
CN12 6-way connector
❑
CN13 6-way connector
T6T 300 Watt VHF Transmitter
Page 110
Maintenance
❑
CN14 6-way connector
❑
CN15 10-way connector
❑
CN16 SMB connector
❑
CN17 SMB connector
❑
CN18 SMB connector
❑
CN22 QMA connector
❑
CN23 QMA connector
❑
CN24 QMA connector
❑
CN25 SMB connector
❑
CN26 SMB connector
❑
CN27 SMB connector.
(3)
The Combiner BIT module is secured from both sides of the chassis thus requiring removal of
the Power Supply modules. Refer to page 109 and remove both Power Supply modules.
(4)
Removal of the Power Supply modules will expose the six M3 x 6 mm countersunk screws that
secure the Combiner BIT module heatsink to the chassis. Remove these six screws.
(5)
Remove the six M3 nuts that secure the Combiner BIT module PCB to the stud spacers. Also
remove the two M3 x 8 mm panhead screws that secure the Combiner BIT module heatsink to
the lower PA heatsink. The Combiner BIT module can now be removed.
Refitting
To refit the Combinere BIT module, proceed as follows:
(1)
Place the Combiner BIT module in place on the stud spacers and replace the six washers and
nuts, previously removed, but do not tighten. Take care that cables are dressed properly and that
none are trapped. Replace the two screws previously removed that secure the Combiner BIT
module to the PA heatsink, but do not tighten.
(2)
Turn the unit over and replace the six countersunk M3 x 6 mm screws previously removed.
Tighten these and return to the other side to tighten the six nuts and two screws.
(3)
All 22 connectors removed earlier can now be reconnected.
(4)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
(5)
Re-establish the ac and/or dc supplies.
(6)
Switch power on at the radio using the rear mounted Supply switch.
(7)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(8)
Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure
To Calibrate the Transmitter on page 130.
(9)
Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(10) Set the rear panel Supply switch to Standby and remove the VFP connector. Isolate the
transmitter from the ac and/or dc supplies.
(11) Refit the amplifier top and bottom covers. The amplifier can now be returned to service.
T6T 300 Watt VHF Transmitter
Page 111
Maintenance
Removing and Refitting the PA Modules
Caution
Repairs
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 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 modules.
The PA modules are located one above the other on the right side of the amplifier as shown in Fig 34.
The module removal diagram is shown in Fig 41. At the amplifier rear panel, each PA module is fastened
to the chassis with two M3 x 8 mm panhead screws. At the front, the modules are fastened with one
countersunk screw each, one at the top (PA-1) and one at the bottom (PA-2). They are also secured to
the front panel with two M5 x 20 mm panhead screws that also fix the right-hand equipment handle.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF amplifier. Care must be taken by personnel
to avoid accidental contact with exposed circuitry when the covers are removed and power
is applied to the radio.
Removal
Before attempting to remove one or both PA modules, ensure that the amplifier is isolated from the ac
and dc input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the antenna
cable to the Combiner. Then proceed as follows:
(1)
Remove the amplifier top and bottom covers as described on page 106.
(2)
Disconnect CN3, a flying 3-way connector from the Combiner BIT module, CN5 (PA-1) and/or
CN6 (PA-2).
(3)
At the Combiner BIT module disconnect the 6-way CN13 (PA-1) and/or CN14 (PA-2). Also
remove the two M3 x 8 mm panhead screws that secure the Combiner BIT module heatsink to
the lower PA module heatsink.
(4)
Disconnect the SMB connectors CN8 from PA-1 (upper) and PA-2 (lower). Disconnect SMB
connector CN10 from the lower PA using long nosed pliers; do not pull on the cable. On the lower
PA remove the screw securing the p-clip that holds the coaxial cable coming from the N-type
connector at the rear.
(5)
Disconnect the N-type connectors at the rear of the PA modules.
(6)
Remove the four countersunk M3 x 6 mm screws that hold the front panel to the chassis.
(7)
Remove the equipment handle from the right-hand side of the amplifier by unscrewing and
removing the two M5 x 20 mm panhead screws that secure it. Loosen (but do not remove) the
two screws securing the left-hand equipment handle so that the front panel can be pulled slightly
away from the PA heatsinks.
T6T 300 Watt VHF Transmitter
Page 112
Maintenance
(8)
Remove the two screws holding the upper heatsink to the rear panel and the countersunk screw
securing it to the front of the chassis. Slowly withdraw the upper PA module from the mainframe
taking care not to snag the wiring looms. Note that SMB connector CN10 is located within the
bottom of the heatsink fins and should be disconnected using long nosed pliers. Do not attempt
to remove the connector by pulling on the cable.
(9)
Remove the two screws holding the lower heatsink to the rear panel and the countersunk screw,
at the front, securing it to the bottom of the chassis. Slowly withdraw the lower PA module from
the mainframe taking care not to snag the wiring looms.
Refitting
To refit the PA modules, proceed as follows:
(1)
Place the lower PA module in position and secure it in place with the previously removede single
countersunk screw at the front and the two panhead screws at the rear. Replace the two screws,
previously removed, that secure the Combiner BIT module to the PA heatsink. Connect the SMB
connector CN10.
(2)
Route the coaxial cable with the N-type connector out the rear of the module and connect to CN1.
Replace the p-clip that was removed earlier. Ensure no wires are trapped by the module.
(3)
Next, while placing the upper PA module in position, first connect SMB connector CN10 before
replacing the two rear screws and the front countersunk screw previously removed. Route the
coaxial cable from Combiner BIT module out between the PAs via the heatsink groove. Connect
the N-type to CN1.
(4)
Fit the four countersunk screws, previously removed, that secure the front panel to the chassis,
two at the top and two at the bottom. Replace the right-hand handle and tighten the screws
securing the left-hand handle.
(5)
Connect the SMB connectors CN8 on both modules and CN13 (PA-1) and CN14 (PA-2) at the
Combiner BIT module.
(6)
Connect the two flying 3-way connectors CN3 that come from CN5 (PA-1) and CN6 (PA-2) on
the Combiner BIT module.
(7)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
(8)
Re-establish the ac and/or dc supplies and switch power on at the radio using the rear mounted
Supply 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 130.
(11) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(12) Set the rear panel Supply switch to Standby and remove the VFP connector. Isolate the amplifier
from the ac and/or dc supplies.
(13) Refit the amplifier top and bottom covers. The amplifier can now be returned to service.
T6T 300 Watt VHF Transmitter
Page 113
Maintenance
Removing and Refitting the Front Panel PCB
The Front Panel PCB is located as shown in Fig 42. Removing this assembly necessitates the removal
of both Power Supply modules and partial removal of the Combiner BIT module.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF amplifier. Care must be taken by personnel
to avoid accidental contact with exposed circuitry when the covers are removed and power
is applied to the radio.
Removal
Before attempting to remove the Front Panel PCB, ensure that the amplifier is isolated from the ac and
dc input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the antenna cable
to the Combiner. Then proceed as follows:
(1)
Remove the amplifier top and bottom covers as described on page 106.
(2)
Disconnect CN7 (10-way ribbon cable) at the Interface module. Carefully push the cable through
the aperture to the other side of the chassis.
(3)
Refer to the instructions for removal of the Combiner BIT module, but do not remove any
connectors. The Power Supply modules must be removed and the Combiner BIT module’s
securing screws must be removed so that it can be lifted slightly away from the chassis. This
permits the ribbon cable to pass under the Combiner BIT module.
(4)
Remove the two handles from the front panel by removing the four M5 x 20 mm panhead screws.
(5)
Remove the four countersunk M3 x 6 mm screws that hold the front panel to the chassis. The
front panel can now be moved away from the mainframe while guiding the ribbon cable from
within.
(6)
Remove the Front Panel PCB from the Front Panel assembly by removing the four M3 x 6 mm
panhead screws and wavy washers.
Refitting
To refit the Front Panel PCB, proceed as follows:
(1)
Place the PCB in position on the front panel. Secure the PCB to the Front Panel assembly using
the four M3 x 6 mm panhead screws and wavy washers previously removed.
(2)
Feed the ribbon cable through its respective hole at the front of the chassis.
(3)
Secure the Front Panel assembly to the top and bottom of the chassis using the four M3 x 6 mm
countersunk screws. Fit the two equipment handles using the four M5 x 20 mm panhead screws
previously removed.
(4)
Route the ribbon cable under the Combiner BIT module, through the aperture to the Interface
module and connect it to CN7.
(5)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
(6)
Re-establish the ac and/or dc supplies.
(7)
Switch power on at the radio using the rear mounted Supply 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 102.
T6T 300 Watt VHF Transmitter
Page 114
Maintenance
(10) Set the rear panel Supply switch to Standby. Isolate the amplifier from the ac and/or dc supplies.
(11) Refit the amplifier top and bottom covers. The amplifier can now be returned to service.
Removing and Refitting the Cooling Fans
The cooling fans are mounted at the rear of the PA modules as shown in Fig 34. The removal diagram
is shown in Fig 43.
Removal
Before attempting to remove the fan, ensure that the T6T VHF amplifier is isolated from the ac and dc
input supplies. Disconnect the drive assembly cables at CN5 and CN8. Disconnect the antenna cable to
the Combiner. Then proceed as follows:
(1)
Disconnect the two-pin connector.
(2)
Remove the fan finger guard.
(3)
Using an Allen key inserted through the holes exposed when the finger guard is 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 a cooling fan, proceed as follows:
(1)
Locate the fan in position and using a suitable Allen key inserted through the holes for the fan
finger guard, secure using the three M4 x 12 mm caphead Allen screws previously removed.
(2)
Secure the finger guard to the fan.
(3)
Connect the two-pin fan connector to the fan. Ensure the + marked socket mates with the +
marked plug on the fan.
(4)
Connect the drive assembly cables at CN5 and CN8. Connect the antenna cable to the
Combiner.
(5)
Re-establish the ac and/or dc supplies.
(6)
Switch power on at the radio using the rear mounted Supply switch.
(7)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit. The amplifier can now
be returned to service.
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Maintenance
T6T VHF Drive Assembly Procedures
Removing the Top Cover
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF drive assembly. Care must be taken by
personnel to avoid accidental contact with exposed circuitry when the covers are removed
and power is applied to the radio.
To remove the top cover, ensure that the drive assembly is isolated from the ac and dc input supplies.
Then locate and unscrew the 13 screws securing the top cover to the mainframe. Access can then be
gained to the following modules:
❑
Processor module
❑
PSU Regulation module
❑
Drive module
❑
Power Supply (requires top and bottom covers to be removed)
❑
Front Panel assembly PCB (requires top and bottom covers to be removed).
Removing and Refitting the Processor Module
The Processor module is located as shown in Fig 44. A module removal diagram is shown in Fig 46.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF drive assembly. Care must be taken by
personnel to avoid accidental contact with exposed circuitry when the covers are removed
and power is applied to the radio.
Removal
Before attempting to remove the Processor module, and if possible, save the drive assembly 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 drive assembly is isolated from the ac and dc input supplies. Disconnect the six Amplifier
Out connectors, CN1 to CN6. Then proceed as follows:
(1)
Unscrew the 13 countersunk screws and remove the drive assembly top cover.
(2)
Locate the Processor module (Fig 44) and disconnect the following connectors:
❑
CN1 50-way connector (50-way ribbon cable from PA Control module)
❑
CN12 2-way connector (2 wire loom from Drive module CN11)
❑
CN3 14-way connector (14-way ribbon cable from PSU Regulation module)
❑
CN4 34-way connector (34-way ribbon cable from Front Panel module).
(3)
Gain access to the rear of the drive assembly. 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 drive assembly mainframe.
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Maintenance
(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 drive assembly (see Fig 30).
JP2
Shown set for
transmitter
TS7
T2
T3
IC38
C84
R/TR
IC19
IC20
IC21
R/TR
IC25
IC27
Fig 30 Processor Module JP2 location
(2)
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, previously removed, but leave them loose.
(3)
Fit the seven M3 x 8 mm screws, previously removed, that secure the module to the drive
assembly mainframe, but leave them loose.
(4)
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 seven M3 x 8 mm screws that secure the module to
the drive assembly mainframe.
(5)
Refit the following connectors to the module:
❑
CN1 50-way connector (50-way ribbon cable from PA Control module)
❑
CN12 2-way connector (2 wire loom from Drive module CN11)
❑
CN3 14-way connector (14-way ribbon cable from PSU Regulation module)
❑
CN4 34-way connector (34-way ribbon cable from Front Panel module).
(6)
Re-connect the six Amplifier Out connectors, CN1 to CN6.
(7)
Re-establish the ac and/or dc supplies.
(8)
Switch power on at the drive assembly using the rear mounted Supply switch.
(9)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(10) If a new module has been fitted, connect the VFP PC to the drive assembly 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
T6T 300 Watt VHF Transmitter
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Maintenance
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.
(11) Download the saved radio settings from file using the VFP. Alternatively, the settings can be
edited by hand as described in the Operation topic. Once entered, ensure the required settings
appear in the VFP screen.
(12) Carry out the Calibrate routine using the VFP, as detailed in the procedure To Calibrate the
Transmitter on page 130.
(13) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(14) Set the drive assembly internal reference frequency by carrying out the procedure detailed on
page 100.
(15) Set the rear panel Supply switch to Standby and remove the VFP connector. Isolate the drive
assembly from the ac and/or dc supplies.
(16) Refit the drive assembly top cover. The drive assembly can now be returned to service.
Removing and Refitting the PSU Regulation Module
The PSU Regulation module is located as shown in Fig 44. A module removal diagram is shown in
Fig 47.
WARNING
Dangerous Voltage
Dangerous voltage is present within the drive assembly. Care must be taken by personnel to
avoid accidental contact with exposed circuitry when the covers are removed and power is
applied to the radio.
Removal
Before attempting to remove the PSU Regulation module, ensure that the drive assembly is isolated from
the ac and dc input supplies. Disconnect the six Amplifier Out connectors, CN1 to CN6. Then proceed
as follows:
(1)
Remove the drive assembly top cover as described on page 116.
(2)
Locate the PSU Regulation module and remove the three M3 x 8 mm captive washer screws that
secure the module to the drive assembly 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)
❑
CN4 14-way connector (14-way ribbon cable to Processor module)
❑
CN7 3-way connector (3-wire loom to rear panel On/Off switch)
❑
CN2 2-way connector (2-wire loom from dc input connector on rear panel)
❑
CN1 4-way connector (4-wire cable from power supply)
❑
CN3 3-way connector (3-wire loom from Drive module)
❑
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).
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Maintenance
(5)
Remove the module from the chassis.
Refitting
To refit the PSU Regulation 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)
❑
CN3 3-way connector (3-wire loom from Drive module)
❑
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)
❑
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.
(3)
Secure the module to the drive assembly mainframe using the three M3 x 8 mm captive washer
screws removed during the removal procedure.
(4)
Re-connect the six Amplifier Out connectors, CN1 to CN6.
(5)
Re-establish the ac and/or dc supplies.
(6)
Switch power on at the rear mounted Supply switch.
(7)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(8)
Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(9)
Set the rear panel Supply switch to Standby. Isolate the drive assembly from the ac and/or dc
supplies.
(10) Refit the drive assembly top cover. The drive assembly can now be returned to service.
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Maintenance
Removing and Refitting the Drive Module
The Drive module is located as shown in Fig 44. A module removal diagram is shown in Fig 48.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF drive assembly. Care must be taken by
personnel to avoid accidental contact with exposed circuitry when the covers are removed
and power is applied to the radio.
Removal
Before attempting to remove the Drive module, ensure that the drive assembly is isolated from the ac
and dc input supplies. Disconnect the six Amplifier Out connectors, CN1 to CN6. Then proceed as
follows:
(1)
Remove the drive assembly top cover as described on page 116.
(2)
Locate the Drive module and disconnect the following connectors:
❑
CN7 SMB connector (RF drive from PA control module CN3)
❑
CN9 SMB connector (forward power sense from PA control module CN4)
❑
CN5 3-way connector (3-wire loom from PSU regulation module CN3)
❑
CN10 6-way connector (6-wire loom from PA control module)
❑
CN11 2-way connector (2-wire loom from Processor module).
(3)
Gain access to the rear of the drive assembly. Using a 5 mm nut spinner tool, remove the six
screwloc 8 mm-4-40 UNC screws that secure the Drive module ribbon cable connectors to the
rear panel. Use the same procedure to remove the three coaxial connectors from the rear panel.
(4)
Remove the five M3 x 8 mm captive washer panhead screws that secure the Drive module to the
drive assembly mainframe.
(5)
Remove the module from the chassis.
Refitting
To refit the Drive module, proceed as follows:
(1)
Locate the module in position. Ensure no wires are trapped by the module.
(2)
Secure the module to the drive assembly mainframe using the five M3 x 8 mm captive washer
panhead screws removed during the removal procedure.
(3)
Using a 5 mm nut spinner, fit the 12 screwloc 8 mm-4-40 UNC screws and wavy washers that
secure the ribbon cable connectors and three coaxial connectors to the rear panel.
(4)
Refit the following connectors to the module:
❑
CN11 2-way connector (2-wire loom from Processor module)
❑
CN10 6-way connector (6-wire loom from PA control module)
❑
CN5 3-way connector (3-wire loom from PSU regulation module CN3)
❑
CN9 SMB connector (forward power sense from PA control module CN4)
❑
CN7 SMB connector (RF drive from PA control module CN3).
(5)
Re-connect the six Amplifier Out connectors, CN1 to CN6.
(6)
Re-establish the ac and/or dc supplies.
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Maintenance
(7)
Switch power on at the radio using the rear mounted Supply 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 102.
(10) Set the rear panel Supply switch to Standby. Isolate the drive assembly from the ac and/or dc
supplies.
(11) Refit the drive assembly top cover. The drive assembly can now be returned to service.
Removing the Bottom Cover
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF drive assembly. Care must be taken by
personnel to avoid accidental contact with exposed circuitry when the covers are removed
and power is applied to the radio.
To remove the bottom cover, ensure that the drive assembly is isolated from the ac and dc input supplies.
Then locate and unscrew the 13 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)
❑
Front Panel assembly (requires top and bottom covers to be removed).
Removing and Refitting the PA Control Module
The PA Control module is located as shown in Fig 44. A module removal diagram is shown in Fig 49.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF drive assembly. Care must be taken by
personnel to avoid accidental contact with exposed circuitry when the covers are removed
and power is applied to the radio.
Removal
Before attempting to remove the PA Control module, ensure that the drive assembly is isolated from the
ac and dc input supplies. Disconnect the six Amplifier Out connectors, CN1 to CN6. Then proceed as
follows:
(1)
Unscrew the 13 countersunk screws and remove the drive assembly bottom cover.
(2)
Locate the PA Control module and disconnect the following connectors:
❑
CN1 50-way connector (50-way ribbon cable to Processor module)
❑
CN6 10-way connector (10-way ribbon cable to PSU Regulation module)
❑
CN5 SMB connector (reference frequency at front panel)
❑
CN3 SMB connector (RF drive to Drive module CN7)
❑
CN4 SMB connector (forward power sense to Drive module CN9)
❑
CN2 6-way connector (6-wire loom to Drive module CN10).
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Maintenance
(3)
Remove the eight M3 x 8 mm captive washer screws that secure the module to the drive
assembly mainframe.
(4)
Remove the module from the chassis.
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 eight M3 x 8 mm captive washer screws, previously removed, that secure the module to
the drive assembly mainframe.
(3)
Refit the following connectors to the module:
❑
CN2 6-way connector (6-wire loom to Drive module CN10)
❑
CN4 SMB connector (forward power sense to Drive module CN9)
❑
CN3 SMB connector (RF drive to Drive module CN7)
❑
CN5 SMB connector (reference frequency at front panel)
❑
CN6 10-way connector (10-way ribbon cable to PSU Regulation module)
❑
CN1 50-way connector (50-way ribbon cable to Processor module).
(4)
Re-connect the six Amplifier Out connectors, CN1 to CN6.
(5)
Re-establish the ac and/or dc supplies.
(6)
Switch power on at the radio using the rear mounted Supply switch.
(7)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(8)
Carry out the Calibrate routine using the Virtual Front Panel (VFP), as detailed in the procedure
To Calibrate the Transmitter on page 130.
(9)
Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(10) Set the drive assembly internal reference frequency by carrying out the procedure detailed on
page 100.
(11) Remove the VFP connector and switch power to Standby using the rear mounted Supply switch.
Isolate the drive assembly from the ac and/or dc supplies.
(12) Refit the drive assembly bottom cover. The drive assembly can now be returned to service.
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Maintenance
Removing and Refitting the Power Supply
The Power Supply is located as shown in Fig 44. A module removal diagram is shown in Fig 50.
WARNING
Dangerous Voltage
Dangerous voltage is present within the drive assembly. Care must be taken by personnel to
avoid accidental contact with exposed circuitry when the covers are removed and power is
applied to the radio.
Removal
Before attempting to remove the Power Supply, ensure that the drive assembly is isolated from the ac
and dc input supplies. Disconnect the six Amplifier Out connectors, CN1 to CN6. Then proceed as
follows:
(1)
Remove the drive assembly top and bottom covers as described on page 116 and page 121.
(2)
Support the drive assembly 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 drive assembly 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 PSU regulation module CN6).
(6)
Disconnect the dc wires from the eight connector terminal block.
(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 drive assembly.
Refitting
To refit the Power Supply:
(1)
With the drive assembly 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 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 previously removed.
(6)
Re-connect the six Amplifier Out connectors, CN1 to CN6.
(7)
Re-establish the ac and/or dc supplies.
(8)
Switch power on using the rear mounted Supply switch.
(9)
Ensure the front panel Ready indicator is lit and the Alarm indicator is unlit.
(10) Carry out a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
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Maintenance
(11) Switch power to Standby using the rear mounted Supply switch. Isolate the drive assembly from
the ac and/or dc supplies.
(12) Refit the drive assembly top and bottom covers. The drive assembly can now be returned to
service.
Removing and Refitting the Front Panel PCB
The Front Panel assembly is located as shown in Fig 44. An assembly and PCB removal diagram is
shown in Fig 51.
WARNING
Dangerous Voltage
Dangerous voltage is present within the T6T VHF drive assembly. Care must be taken by
personnel to avoid accidental contact with exposed circuitry when the covers are removed
and power is applied to the radio.
Removal
Before attempting to remove the Front Panel PCB, ensure that the drive assembly is isolated from the
ac and dc input supplies. Disconnect the six Amplifier Out connectors, CN1 to CN6. Then proceed as
follows:
(1)
Remove the drive assembly top and bottom covers as described on page 116 and page 121.
(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 51, Diagram A).
(5)
Remove the two black equipment handles by unscrewing and removing the four M5 x 20 mm
panhead screws and wavy washers that secure them to the drive assembly. 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.
(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 51 Diagram B).
Refitting
To refit the Front Panel 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 previously removed (see
Fig 51, 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, previously removed. Fit the two black equipment handles
using the four M5 x 20 mm panhead screws and wavy washers previously removed (see Fig 51,
Diagram A).
(4)
Route the ribbon cable to the Processor module connector CN4 and connect it.
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Maintenance
(5)
Route the SMB connector to CN5 on the PA Control module and connect it.
(6)
Re-connect the six Amplifier Out connectors, CN1 to CN6.
(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 a BIT interruptive test as detailed in the procedure To Initiate a BIT Test on page 102.
(11) Switch power to Standby using the rear mounted Power switch. Isolate the drive assembly from
the ac and/or dc supplies.
(12) Refit the drive assembly top and bottom covers. The drive assembly can now be returned to
service.
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Maintenance
Virtual Front Panel (VFP)
Virtual Front Panel (VFP) software is supplied on CD 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 drive assembly from the front panel; these are:
❑
A profile of the drive assembly operation settings and channel information can be created, stored
on disk, and then recalled to download into other drive assemblies
❑
A printout of the drive assembly profile can be made from the VFP
❑
Front Panel Lock is available only when using the VFP. As part of the drive assembly Settings
(see Fig 31), 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 drive assembly 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.
Fig 31 Typical VFP Screen - AM-Voice Profile Shown
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Maintenance
Installing the VFP Software
The VFP software is supplied by Park Air on CD. 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 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.
File
Has 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 Port
Has 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.
Radio
Has the sub-categories: Retrieve, Send, Calibrate and Test. These sub-categories allow
a radio’s profile to be loaded into the VFP, allow a profile to be downloaded from the VFP
to a radio, calibrates a radio and initiates a BIT test.
Help
Provides detail about the VFP software.
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Maintenance
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. 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 drive assembly 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 front panel controls as detailed on page 100.
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.
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Maintenance
To Change the Drive Assembly Profile or Save a Profile
(1)
Using a PC to Radio Interconnection Lead, Park Air part number 17E12600001, connect the
drive assembly’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 (see Fig 32) is displayed.
Fig 32 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, select File > Open > All
or, File > Open >Settings
or, File > Open > Channel
or, File > Open > BIT
To load information from the radio, select Radio > Retrieve > All
or, Radio > Retrieve > Settings
or, Radio > Retrieve > Channel
or, Radio > Retrieve > BIT
(5)
If required, amend any radio Settings or Channel information.
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Maintenance
(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, select File > Send > All
or, File > Send > Settings
or, File > Send > Channel
or, File > Send > BIT
(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
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.
(1)
Using a PC to Radio 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 suitable dummy load via a power meter to the combiner’s Antenna connector.
(2)
Remove the drive assembly’s bottom cover.
(3)
Using a PC to Radio Interconnection Lead, Park Air part number 17E12600001, connect the 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.
T6T 300 Watt VHF Transmitter
Page 130
Maintenance
(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.
(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 Fig 33). From the drive assembly’s
front panel AM-Voice or AM-MSK Settings screen, select PTT On.
(11) From the Settings window of the VFP screen, note the RF power setting. Adjust RV8 until the
power meter reads this value.
(12) From the drive assembly’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 and refit the bottom cover.
Location of RV8
RV8
R135
R125
R131
C421
R382
R130
RV8
D24
R456
R243
R455
TP10
CN4
R231
C424
R348
Fig 33 Location of PA Control Module RV8
T6T 300 Watt VHF Transmitter
Page 131
Maintenance
Intentionally Blank
Power Supply Modules
PSU Regulation Module
Interface Module
Top View
Fig 34 T6T VHF Amplifier Module Location Diagram
Front Panel Assembly
PA Modules
Bottom View
Combiner BIT Module
8
10
11
12
13
14
CN5-8
CN5-9
CN5-10
CN5-11
CN5-12
CN5-13
CN5-14
CN5-15
0V=off,opencollector=on
Remote on/off
CN2-9
CN2-10
CN15-9
CN15-10
Fan
Fan
10
CN6
PA-2
Connections
PA Heatsink
PA-1
CN24-1
PA
Ground
Fan Control
Name
RF Output
Antenna Port
Name
CN3-1
CN16-1
Connections
RF Drive
Interface
Name
Forward Power Sense
Name
PA-2 Fail Indication
Ground
Combiner BIT module
CN4-1
CN27-1
Connections
Interface
Combiner BIT module
CN2-8
CN15-8
Connections
Combiner Supply
PA-1 Fail Indication
CN2-7
CN15-7
0V
10 V approx or 26.5 V
Characteristic
10 to 100 W
Characteristic
1 dBm carrier
Characteristic
17 dBm
Characteristic
TTL, 0 V = fail
TTL, 0 V = fail
Unreg current limited at 250mA
0V
50 W = 670 mV
TTL, Pulse width = 10 ms/50 W PA
PA Count
CN2-6
CN15-6
TTL - High for fan on
Fan Enable
CN2-5
CN15-5
Reflected Power
CN2-4
CN15-4
0.5 V for +10 dBm
TTL - High for bias on
Drive Detect
CN2-3
CN15-3
PA Bias Enable
CN2-2
CN15-2
10 mV / °C +0.5 V
Characteristic
PA Temperature
CN2-1
Interface
CN15-1
Combiner BIT module
15 Von,0 Voff
Open collector
n/c
TTL Low to indicate failure
n/c
+5 V
AC Detect
DC Detect
n/c
Fail 3
n/c
Present
TTL - High for PA Keyed
50 W = 670 mV
Name
CN5-7
TX Key
Reflected Power
TTL - High for fan on
CN5-6
Connections
CN5-5
Fan Enable
TTL - High for bias on
0V
CN5-4
PTT
10 mV / °C +0.5 V
0.5 V for +10 dBm
Ground
CN5-3
Drive Detect
PA Temperature
15
CN5-2
Characteristic
17 dBm
1 dBm carrier
Characteristic
n/c
CN5-1
Name
Forward Power Sense
RF Drive
Name
n/c
Facilities
Interface
CN8-2
Connections
CN8-1
MARC Port
Connections
Interface
17
26
CN6
CN1
1L
2N
3E
17
CN7
CN2
CN4
CN3
24
17
(Rear Panel)
Mains IEC
connector
filtered/
fused
20
ac Input
(Rear Panel)
dc Input - 2
(Rear Panel)
20
ac Input
(Rear Panel)
dc Input - 1
(Rear Panel)
Mains IEC
connector
filtered/
fused
(Rear Panel)
Fig 35 T6T VHF Amplifier Wiring and Interconnection Diagram
CN5
CN6
Facilities
MARC
CN1
Interface module
Supply shown in
off position
(Rear Panel)
CN7
1 2 3
Power Supply
Regulation
CN9
CN3
1L
2N
3E
CN2
CN8
CN6
CN5
CN4
Front Panel assembly
CN1
CN1
PSU-2
CN4
18
PSU-1
CN4
18
CN6
CN25
CN18
CN23
CN13
CN5
CN26
CN17
CN22
CN12
CN15
CN27
CN16
CN24
CN14
Combiner BIT
module
CN4
19
CN3
CN11
CN2
19
CN1
CN10
CN7
Fan
11
Fan
11
12
13
14
12
13
14
CN2
CN4
CN5
CN7
CN9
CN12
CN6
CN8
CN1
15
PA-2
CN8
CN1
PA-1
CN10
CN3
(Rear Panel)
10
10
CN2
CN4
CN5
CN7
CN9
CN12
CN6
CN3
CN10
16
17
15
PA-1
13
Connections
Connections
CN18-1
Connections
CN23-1
CN10-3
TTL - High for bias on
0V
0V
PSU off
Name
CN6-5
CN6-6
17
CN12-5
CN12-6
Ground
DC Derived Supply
Ground
Pin Diode - ve
CN1-3 & 4
CN2-1
CN2-2
CN3-3
CN3-2
CN3-1
n/c
CN7-2
CN7-3
CN7-4
CN7-5
CN7-6
CN7-7
CN7-8
n/c
V Unregulated
Ground
AC Derived Supply
CN1-1 & 2
CN7-1
Combiner BIT module
Regulation
0 V=on
PSU off
CN6-4
CN12-4
Connections
o/c ok
PSU ok
CN6-3
Connections
CN11-3
CN11-2
CN3-4
Connections
CN3-6
CN4-6
CN4-14
CN4-13
CN4-12
CN4-11
CN4-10
CN4-9
CN4-8
CN3-14
CN3-13
CN3-12
CN3-11
CN3-10
CN3-9
CN3-8
CN3-7
CN3-5
CN4-5
CN4-7
CN3-4
CN3-3
CN3-2
CN3-1
Processor
26
CN4-4
CN4-3
CN4-2
CN4-1
Regulation
Connections
CN1-10
CN7-10
n/c
Remote on/off
V Unreg
V Unreg
DC Detect
AC Detect
-15 V Supply
-15 V Supply
Ground
Ground
+5 V Supply
+5 V Supply
+15 V Supply
+15 V Supply
Name
n/c
n/c
CN1-9
CN7-9
n/c
n/c
CN1-8
CN1-7
+15 V
CN7-8
CN7-7
CN1-6
0V
CN1-5
CN7-5
CN7-6
TX LED
CN1-4
CN7-4
Ready LED
Alarm LED
0V
Name
CN1-3
CN1-2
CN1-1
Front Panel
n/c
Ground Supply
Dc Input
Name
V Unreg
V Unreg
Ground Supply
Ground Supply
CN7-3
CN7-2
CN7-1
Interface
24
CN2-1
Input-2
Input-3
CN2-2
Input-1
PSU-2
Regulation
20
CN1-2
CN1-1
CN1-6
CN1-5
PSU-1
DC Input-1, DC Input-2
Connections
CN3-3
CN1-4
CN3-2
CN1-2
CN1-3
CN3-1
CN1-1
19
n/c
0 V=off, open collector=on
21.6 to 32 V
21.6 to 32 V
Open collector
15 V on, 0 V off
-15 V
-15 V
0V
0V
+5 V
+5 V
+15 V
+15 V
Characteristic
n/c
n/c
n/c
n/c
+15 V
0V
Open Collector, 21 mA maximum
Open Collector, 21 mA maximum
Open Collector, 21 mA maximum
0V
Characteristic
n/c
0V
Fused 21.6 V to 32 V
Characteristic
29 V
29 V
0V
0V
Characteristic
0V
Ground
CN4-3
Name
0 V = off
CN4-1
TTL, high = PSU on
Characteristic
dc OK
PSU-2
Name
PSU off
18
CN4-2
PSU-1
Fig 36 T6T VHF Amplifier Wiring List
n/c
21.6 V to 32 V
-30 V to -35 V
0V
21.6 V to 32 V
0V
29 V
0V
Characteristic
0 V=off
0 V ok
PSU ok
CN6-2
CN12-3
CN12-3
0V
Characteristic
5 to 50 W
Characteristic
1 dBm carrier
Characteristic
17 dBm ±1 dB (-30.5 dBc ± 0.9 dB)
Characteristic
0V
-30 V to -35 V
21.6 V to 32 V
Characteristic
TTL, PW = 10 ms/50 W PA
50 W = 670 mV
CN6-1
0V
Name
16
Regulation
RF Output
PA-2
Name
15
CN1-1
PA-1
RF Drive
Name
Forward Power Sense
CN10-2
0.5 V for +10 dBm
CN11-1
Combiner BIT module
CN10-1
TTL - High for fan on
Connections
Combiner BIT module
10 mV / °C +0.5 V
Characteristic
CN12-1
Combiner BIT module
CN22-1
Combiner BIT module
CN17-1
PA-2
PA-2
Name
Ground Supply
-33 V
V Unreg
Name
CN10
14
PA-1
Connections
Combiner BIT module
CN8
PA-1
CN26-1
Combiner BIT module
CN3-3
CN6-3
CN5-3
CN3-2
CN6-2
CN5-2
CN3-1
CN6-1
CN5-1
CN25-1
PA-2
12
Combiner BIT module
Connections
CN13-6
PA Count
CN14-5
CN13-5
Fan Enable
PA Bias Enable
CN5
CN7
CN12
CN14-4
CN13-4
Drive Detect
CN2
CN14-6
CN14-3
CN13-3
PA Temperature
PA-2
CN4
Name
Reflected Power
CN14-2
CN13-2
PA-1
11
CN9
CN14-1
CN13-1
Combiner BIT module
Connections
CN4
CN7
CN6
Fig 37 T6T VHF Amplifier Interface Module - Removal and Refitting Detail
CN3
CN2
CN7
CN2
CN3
CN4
CN1
Fig 38 T6T VHF Amplifier PSU Regulation Module - Removal and Refitting Detail
CN6
PSU to Bit Combiner (dc Connections)
Bit Combiner to PSU (fan control)
PSU-1
Fig 39 T6T VHF Amplifier Power Supplies - Removal and Refitting Detail
PSU-2
PSU to Bit Combiner (dc Connections)
Bit Combiner to PSU (fan control)
CN4
CN14 CN13
CN15
CN26
CN23
CN22
CN27 CN25 CN24
Connector
Locations
CN17 CN16
Fig 40 T6T VHF Amplifier Combiner BIT Module - Removal and Refitting Detail
CN7
CN12
CN5
CN6
CN11CN10
CN1 CN3
CN2
CN18
Fig 41 T6T VHF Amplifier PA Modules - Removal and Refitting Detail
PA-2
PA-1
Fig 42 T6T VHF Amplifier Front Panel PCB - Removal and Refitting Detail
To Interface module CN7
power connectionshere
here
Power connections
Finger
guard
Finger
guard
AIRFLOW
Fig 43 T6T VHF Amplifier Cooling Fans - Removal and Refitting Detail
Power Supply
PSU Regulation Module
Processor Module
Top View
Front Panel Assembly
PA Control Module
Fig 44 T6T VHF Drive Assembly Module Location Diagram
Drive Module
AMPLIFIER OUT
ANTENNA
DANGER HIGH
RF VOLTAGES
CONNECT
ANTENNA
BEFORE
USE
T1/E1
HDLC
MARC
AUDIO
FUSE F1
DC SUPPLY
DISCONNECT SUPPLIES WHEN NOT IN USE
21.6 - 32V 10A
F15A 32V
SEE INSTALLATION INSTRUCTIONS BEFORE
CONNECTING SUPPLIES
FUSE F2
110-240V T4A 250V IEC
110V - 120V T4A 125V UL
AC SUPPLY
RATINGS
FACILITIES
48 - 62Hz
~ 110 - 240V ( +10%) 4A
POWER 400VA max
MARC
Bottom View
MARC
DATA
FUSE F1
SUPPLY
FUSE F2
DC SUPPLY
AC SUPPLY
LCD RS
CN1-5
CN4-5
CN2-2
CN2-3
+5 V Supply
CN1-16
CN1-17
CN1-18
CN4-16
CN4-17
CN4-18
Ground
LED RX (not used)
Turn +
CN1-21
CN1-22
CN1-23
CN1-24
CN1-25
CN1-26
CN1-27
CN1-28
CN1-29
CN4-21
CN4-22
CN4-23
CN4-24
CN4-25
CN4-26
CN4-27
CN4-29
CN1-32
CN1-33
CN1-34
CN4-32
CN4-33
CN4-34
5 V pull-up
0 V=PTT, 5 V pull-up=PTT
0V
Mic PTT
Ground
0V
Ground
+15 V
+15 V Supply
+5 V Supply
+5 V Supply
CN3-3
CN3-4
CN4-3
CN4-4
-15 V Supply
ac Detect
dc Detect
V Unreg
V Unreg
CN3-8
CN3-9
CN3-10
CN3-11
CN3-12
CN3-13
CN3-14
CN4-7
CN4-8
CN4-9
CN4-10
CN4-11
CN4-12
CN4-13
CN4-14
Ground
Ground
-15 V Supply
-15 V Supply
ac Detect
dc Detect
CN6-5
CN6-6
CN6-7
CN6-8
CN6-9
CN6-10
CN5-5
CN5-6
CN5-7
CN5-8
CN5-9
CN5-10
CN8 Sleeve
PTT
External VSWR
CN5-3
CN5-4
CN5-5
CN5-6
CN5-7
CN5-8
Ground
Squelch Defeat (not used)
Antenna Change-over
Antenna Change-over
0V
TTL pull-up active low
Grounding output +/- 60V,
100 mA maximum
Grounding output +/- 60V,
100 mA maximum
TTL pull-up active low
TTL pull-up active low
Grounding output +/- 60 V,
100 mA maximum
E Bit
CN5-2
0V
Ground
CN5-1
Name
Facilities
Processor
Connections
0V
External Speaker Drive 3 Vac pk-pk maximum
Ground
External Speaker Drive 3 Vac pk-pk maximum
CN8 Ring
Characteristic
n/c
n/c
-15 V
-15 V
0V
0V
+5 V
+5 V
+15 V
+15 V
Characteristic
n/c
0V=off, open collector=on
21.6 to 32 V
21.6 to 32 V
Open collector
15 V on, 0 V off
-15 V
-15 V
0V
0V
CN8 Tip
External Speaker
Processor
Name
+5 V Supply
Connections
+5 V Supply
CN6-3
CN6-4
CN5-4
CN6-2
CN5-2
CN5-3
+15 V Supply
CN6-1
+15 V Supply
PA Control
CN5-1
Name
n/c
Regulation
Connections
-15 V Supply
CN3-7
CN4-6
Remote on/off
Ground
Ground
CN3-5
CN3-6
CN4-5
+5 V
+5 V
+15 V
+15 V Supply
CN3-2
CN4-2
CN4-1
Regulation
14
CN3-3
CN3-2
CN3-1
CN3-3
CN3-2
CN3-1
12
13
CN5-12
CN5-13
CN5-15
15
14
11
CN5-11
10
Facilities
Characteristic
CN2
CN4
1L
CN11-2
0V
Ground Supply
Name
**
CN6
Reserved
Tape Output
Ready Output
RSSI (not used)
BIT Interruptive Test
Inhibit
Unregulated Supply
Characteristic
CN5
Facilities
CN1
CN2
CN4
CN6-7
CN6-8
CN6-9
CN7
CN3-1
CN1
Reflected Power
PA Count
CN10-6
CN2-6
Fan Enable
CN2-4
CN10-5
CN10-4
CN2-5
PA Bias Enable
Drive Detect
PA Temperature
Name
PA Control
module
CN6
CN4
CN3
-20 dBm to 0 dBm
Characteristic
25 Hz 1 Amplifier
12.5 Hz 2 Amplifiers
6.25 Hz 3 Amplifiers
50 W = 670 mV
TTL - High for fan on
TTL - High for bias on
Drive CN4/5/6 Amplifier 1/2/3
Name
Not used
Present
Amplifier keyed
Reflected Power
Fan Enable
PTT
Drive Detect
PA Temperature
Drive
module
CN10
CN6
CN5
CN4
Connections
CN9
CN11
CN8
CN7
CN1-2 CN2-2 CN3-2
CN1-1 CN2-1 CN3-1
Characteristic
N/A
TTL - High for present
TTL - High for keyed
50 W = 670 mV
TTL - High for fan on
TTL - High for PTT
0.5 V for +10 dBm
10 mV/°C + 0.5 V
1 dBm carrier
RF Drive
-2
CN1/2/3 - 2
Name
Forward Power Sense 17 dBm ± 1 dB (-30.5 dBc ± 0.9 dB)
29 V
CN1-10 CN1-10
V Unreg
V Unreg
Ground
Filter 0
Filter 1
CN1-17 CN1-17
CN1-18 CN1-18
CN1-19 CN1-19
CN1-31
NB/WB (not used)
BIT Control 0
CN1-36
TTL
TTL - High fan on
TTL
TTL
TR Detect
V/U Detect
CN1-47 CN1-47
CN1-48
Processor
15
14
13
12
11
10
15
14
13
12
11
10
Facilities
Ground
Not used
Remote on/off
ac Detect
dc Detect
Not used
Fail 3
Name
CN1-50 BITControl3(not used)
Connections
CN1-50
CN1-49 CN1-49 BITControl2(not used)
CN1-48
Step Size (not used)
Characteristic
0V
N/A
0 V=off, open collector=on
15 V on, 0 V off
Open collector
N/A
TTL pull-up active low
TTL
TTL
TTL
Reserved
TTL
TTL - Low OCXO fitted
CN1-46 CN1-46
OCXO Fitted
CN1-44
CN1-44
TTL
TTL
TTL
CN1-45 CN1-45
Fan Enable
RF PA Bias Disable
CN1-43
CN1-42
CN1-43
CN1-42
BIT VSWR OK
CN1-41
CN1-41
TTL
BIT Loop Correct
CN1-40
CN1-40
TTL
BIT Open Loop
BIT Synth Lock
CN1-38
CN1-39
CN1-38
CN1-39
BIT Control 1
CN1-37
TTL
TTL
TTL
TTL
10 mV / °C
0 to 2.5 V
10 mV / °C
0 to 5 V (5 V, 3 dB back off)
CN1-37
CN1-36
External VSWR
CN1-34
CN1-35
PAC Temperature
CN1-34
CN1-33
Reflected Power
PA Temperature
CN1-35
CN1-33
CN1-32 CN1-32
CN1-31
Auto Level Control
Tx Key
CN1-30
CN1-29
CN1-30
CN1-29
TTL
TTL
Phase Load
Reserved
CN1-27
CN1-28
CN1-28
CN1-27
TTL
TTL
CN1-26
CN1-26
Clock
TTL
Data
CN1-25
0V
TTL
CN1-25
Ground
TTL
Synth Load
CN1-23
Filter 4
TTL
TTL
TTL
0V
TTL pull up active low
TTL
0 to 4 V / 0 to 6 V
CN1-24 CN1-24
CN1-23
CN1-22
CN1-22
Filter 3
Power Down
CN1-21
Tx/Rx Detect
CN1-15
CN1-15
CN1-16 CN1-16
Filter 2
Frequency Trim
CN1-20 CN1-20
Ground
CN1-13
CN1-14
0V
0V
±2.5 V
0V
±2.5 V
0V
0 to 2.5 V
0V
0 to 2.5 V
0V
0 to 2.5 V
CN1-13
CN1-21
Characteristic
0 to 2.5 V
0V
Ground
BIT Q Monitor
Ground
BIT I Monitor
Ground
CN1-14
CN1-12 CN1-12
CN1-11 CN1-11
CN1-9
29 V
CN1-8
CN1-7
CN1-9
CN1-8
CN1-7
CN1-5
CN1-5
CN1-6
Ground
CN1-4
CN1-4
CN1-6
RF AGC (Not used)
CN1-3
0V
Characteristic
IF AGC (Not used)
CN1-2
CN1-2
CN1-3
Ground
Ground
CN1-1
Name
0 V or +10 V to +60 V or
-10 V to -60 V at 6 mA
0V
0 V or +10 V to +60 V or
-10 V to -60 V at 6 mA
+20 dBm to -20 dBm 600R
+20 dBm to -20 dBm 600R
CN1-1
Processor PA Control
***
Connections
Not used
Ground
0V
Ground Supply
Characteristic
Unregulated Supply 21.6 V to 32 V
PTT Input
Not used
Not used
+20 dBm to -20 dBm 600R
Line In +
NPN open collector
Fast antenna
change-over/PTT grounding transistor
+20 dBm to -20 dBm 600R
Characteristic
21.6 V to 32 V
0V
RS 422
Line In -
Name
Unregulated Supply
Ground
Remote Supply On/Off
Data Tx A (Data Out -)
Data Tx B (Data Out +)
Pin Number
* CN7D
RS 422
RS 422
n/c
Data Rx B (Data In +)
Characteristic
RS 422
Name
Data Rx A (Data In -)
Pin Number
Ground Supply
Name
0V
-1
1 dBm carrier
0.5 V for +10 dBm
HDLC CL B
Amplifier 1/2/3
Characteristic
Characteristic
HDLC Tx A
RS 422
RS 422
Drive
17 dBm ± 1 dB
(-30.5 dBc ± 0.9 dB)
CN1-4
Connections
CN1-2
CN1-3
CN1-1
CN1-2
CN1-5
CN1-6
CN1-1
Regulation
PSU
HDLC Tx B
Ground
RS 422
HDLC CL A
RS 422
HDLC Rx B
RS 422
HDLC Rx A
RS 422
Characteristic
Name
ANSI T1.403-1995 (T1)
ITU-T: G.703 (E1)
ANSI T1.403-1995 (T1)
ITU-T: G.703 (E1)
Characteristic
Pin Number
* CN7B
n/c
n/c
n/c
TTIP
TRING
n/c
RTIP
RRING
Name
Pin Number
* CN7C
CN1/2/3 - 1
Characteristic
10 mV/°C + 0.5 V
CN2
Reference Frequency
Name
RF Drive
Name
Forward Power Sense
Name
CN10-3
CN10-1
CN10-2
CN1
Power
Supply
CN4
CN2-3
CN2-2
CN5
CN4-1
Front Panel
Drive
Connections
CN5-1
PA Control
Connections
Drive
Connections
CN4-1
CN9
PA Control
Connections
PA Control
CN2-1
Connections
PSU off 0V = 0ff
N ac Input
0V
0V
PSU off
Mains IEC
Connector
Filtered/
Fused
CN4-1
(Rear Panel)
CN4-3
CN6-6
PSU off
CN6-4
CN6-5
Open circuit OK
PSU OK
CN6-3
0 V = on
0 V OK
PSU OK
0V
CN6-2
Name
0V
PSU
Characteristic
CN6-1
Regulation
Connections
Drive
PA Control
***
50
0V
n/c
Fused 21.6 to 32 V
dc Input
Ground Supply
CN2-2
CN2-2
CN2-1
n/c
Characteristic
RS422
Data TX A - Data Out -
RS422
RS422
Data RX A - Data In Data TX B - Data Out +
RS422
Fused 500mA, 21.6 to 32 V
0 V or +10 V to +60 V or
-10 V to -60 V at 6 mA
+20 dBm to -20 dBm 600R
Name
Regulation
0V
Characteristic
+20 dBm to -20 dBm 600R
Data RX B - Data In +
Unregulated Supply
PTT Input
Name
* CN7A
Fig 45 T6T VHF Drive Assembly Wiring and Interconnection Diagram
n/c
-10 dBm. 100R
Open collector, 0 V=Ready
Potential range 0 V to 10 V
TTL pull-up active low
TTL pull-up active low
Fused 300 mA 21.6 to 32 V
CN8
MARC EXT SPKR
Processor module
n/c
-33 V
Characteristic
0 V=off,
Remote
on/off open collector=on
Ground
0V
Name Characteristic
21.6 to 32 V
Name
CN12-1
CN12-2
CN11-1
Connections
Processor
Drive
3E
(Rear Panel)
dc Input
Reference Frequency
(Front Panel)
V Unreg
CN1
CN9
CN5
CN1
Input-3
n/c
n/c
Input-1
Input-2
0V
CN6-5
CN6-6
Connections
DC Input
Ground
CN8 2 N
Heatsink
CN8
Drive
CN7
CN3
Regulator
Connections
CN5-10
CN5-14
Supply
(shown in
off position)
(Rear Panel)
CN7
1 2 3
Power
Supply
Regulation
Connections
Processor
CN3
CN6
CN5
CN4
Name
0V
6k8 input impedance, 5 mV sensitivity
Loudspeaker Output 7.5 V pk-pk maximum
CN3
Front Panel
Connections
Ground
Microphone Input
CN5-9
10
34
RS232
CN6-4
CN6-3
RS232
Line In -
Line In +
CN6-2
0 V = PTT, 5 V pull-up = not PTT
Ground
CN6-1
MARC Port
Connections
Processor
**
0V
Characteristic
Sidetone (Headset Drive) 3 Vac pk-pk, 200R
Receive Data
MIC PTT
Transmit Data
Ground - Microphone
Microphone/Diagnostics
CN2
Name
Front Panel assembly
Characteristic
1.6 V pk-pk maximum
Mic Input
Characteristic
0V
Ground
Name
2 V pk-pk maximum
Loudspeaker Amp Drive
Sidetone (Headset Drive) 3 Vac pk-pk
5 V pull-up
Push
5 V pull-up
Open collector (5 mA)
0V
+15 V
0V
-5 V
RS232
+5 V
RS232
Open collector (200 mA)
TTL
Turn -
Ground
Proce
ssor
CN3-1
Connections
CN1-30
CN1-31
CN4-30
CN4-31
CN4-28
-5 V Supply
CN4-20
+15 V Supply
Receive Data
CN1-19
CN1-20
CN4-19
Transmit Data
LCD Backlight
Data 7
TTL
Data 6
CN1-14
CN1-15
CN4-14
TTL
CN4-15
TTL
Data 5
CN1-13
CN4-13
TTL
Data 4
Data 3
CN1-11
CN1-12
TTL
CN4-11
Data 2
CN4-12
CN1-10
CN4-10
CN2-7
TTL
TTL
Data 1
Data 0
CN1-8
CN1-9
CN4-9
CN2-6
TTL
LCD Enable
CN4-8
CN2-5
TTL
LCD R/W
CN1-6
CN1-7
CN4-6
CN4-7
CN2-4
LED Tx
CN2-1
TTL
Open collector (5 mA)
Open collector (5 mA)
LED Standby
CN1-3
CN1-4
CN4-4
Open collector (5 mA)
LED Ready
CN4-2
CN4-3
Open collector (5 mA)
LED Alarm
CN1-1
CN1-2
CN4-1
Front Panel
Processor
Connections
Microph
Front Panel Microphone/
one/
Diagnostics
T1/E1
Characteristic
HDLC
Name
MARC DATA
Connections
MARC AUDIO
CN5
CN1
CN12
CN4
Fig 46 T6T VHF Drive Assembly Processor Module - Removal and Refitting Detail
CN6
CN3
CN9
CN8
CN5
CN4
CN2
CN7
CN6
Fig 47 T6T VHF Drive Assembly PSU Regulation Module - Removal and Refitting Detail
CN8
Brown (L)
Blue (N)
CN9
CN7
CN8
CN11
Driver Module
Fig 48 T6T VHF Drive Assembly Drive Module - Removal and Refitting Detail
CN10
CN1
CN5
CN2
PC
CN4
CN4
CN3
CN3
Fig 49 T6T VHF Drive Assembly PA Control Module - Removal and Refitting Detail
CN6
Power
Supply
Power
Supply
To PSU Regulation
Module
Fig 50 T6T VHF Drive Assembly Power Supply - Removal and Refitting Detail
CN1
CN6
CN9
Diagram A
Diagram B
Front panel
Fig 51 T6T VHF Drive Assembly Front Panel PCB - Removal and Refitting Detail
head grub
screw
Allen headAllen
grub
screw
To PA Control module CN5
Front
panel
PCB
Front panel
PCB
To Processor module CN4

---

Source Exif Data:

File Type                       : PDF
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Page Count                      : 72
Page Mode                       : UseOutlines
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About                           : uuid:d3321eae-72a4-4ef7-8b0b-cd11c4d730e4
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Modify Date                     : 2007:05:15 14:07:21+01:00
Create Date                     : 2006:03:22 07:42:21Z
Metadata Date                   : 2007:05:15 14:07:21+01:00
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Instance ID                     : uuid:0d7acdf9-d69c-4575-a4ab-4a5bbbb2d69f
Format                          : application/pdf
Creator                         : B.Adolphson
Title                           : 300W VHF Hardcopy.book
Author                          : B.Adolphson

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