Technisonic TFM-550 Multiband FM Airborne Transceiver User Manual 99re262A 8
Technisonic Industries Limited Multiband FM Airborne Transceiver 99re262A 8
User Manual
1
TFM-550
V
HF High/VHF Low/UHF
MULTIBAND FM AIRBORNE TRANSCEIVER
Installation and
Operating Instructions
TiL Document No. 99RE262
Rev. A Issue 8
AUGUST 2010
Technisonic Industries Limited
240 Traders Boulevard, Mississauga, Ontario L4Z 1W7
Tel: (905) 890-2113 Fax: (905) 890-5338
www.til.ca
Copyright 2010 by Technisonic Industries Limited. All rights reserved.
2
i
REVISION HISTORY
[ 99RE262 ]
REV SECTION
- PAGE - DESCRIPTION DATE
EDITED
BY
99RE262
Rev A
Issue 4
CR 08194
Overall
No change to fit, form or function.
Grammar and spelling check was done, corrected typos, etc.
as needed or found.
A-Page:
Added NOTICE regarding new address change that may
appear different throughout this manual.
Document was updated from one program format to another.
See NOTE below. MAR 2008 FM
99RE262
Rev A
Issue 5
CR 08385
A-Page:
Add Revision Page to record manual updates
Changed Note to FCC Compliance Information
Global
Changes
[Footers changed to reflect Rev changes]
[Corrected any spelling errors found]
[minor page formatting changes done more spacing under
header]
NOV 2008 FM
99RE262
Rev A
Issue 6
NOTE: New document template/layout/format.
- New Title page includes Logo, product photo.
- Rev History Approval column change to Edited By.
- Frontal matter, Contents and footer updated.
- All other data remains unchanged.
- Added Support Notes as Appendix B.
- Warranty page added.
CR 10988
To correct errors introduced in last issue
1-4
FCC testing has updated the temp stability spec
Added (-30 to +65ºC)
±2.6 ppm (+65º to +70ºC)
2-2 Replace incorrect Fig 2.1 FEB 2010 FM
Rev A
Issue 7 A-2 Procedure A freq 39.3855 MHz chg to 39.3850 MHz
(typos chg MHz to MHz in table.
A-5 Procedure C freq 36.0333 chg to 36.0325
A-6 freq 36.0333 chg to 36.0325
A-7 Procedure E freq 515 MHz chg to 512 MHz
B-1 Removed Appendix B “Support Notes” MAR 2010 FM
Rev A
Issue 8 1-1 Added notes regarding UHF sub bands and the 406
distress beacon band.
-3- Added flight test option to glide slope test
1-4 FCC testing has updated the TX temp stability spec:
±2.5 ppm (-30ºC to +55ºC)
±2.6 ppm (-45ºC to -30ºC, +60ºC to +70ºC) AUG 2010
SM
ii
TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
iii
NOTES
ESD CAUTION
This unit contains static sensitive devices. Wear a grounded wrist strap and/or conductive gloves
when handling printed circuit boards.
FCC COMPLIANCE INFORMATION
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference when the equipment is operated in a commercial environment. This equipment generates,
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment
in a residential area is likely to cause harmful interference in which case the user will be required to
correct the interference at his/her own expense.
Do not use the TFM-550 in the frequency band 406.0 MHz – 406.1 MHz. This frequency band reserved
for distress beacons.
WARNING: For compliance with FCC RF Exposure Requirements, the mobile transmitter antennas
installation shall comply with the following conditions:
1. The transmitter antennas gain shall not exceed 3 dBi.
2. The transmitter antennas shall be located outside of a vehicle and must not be co-located (kept at
a separation distance of more than 20cm from each other when installed). Also they must be
installed in such a way that they always maintain a separation distance of more than 90cm from
any person during operation.
WARNING AND DISCLAIMER
Changes or modifications not expressly approved by Technisonic Industries could void the user’s
authority to operate the equipment.
This manual is designed to provide information about the TFM-550. Every effort has been made to make
this manual as complete and accurate as possible.
WARRANTY INFORMATION
The Model TFM-550 Transceivers are under warranty for one year from date of purchase. Failed units
caused by defective parts, or workmanship should be returned to:
Technisonic Industries Limited
240 Traders Boulevard
Mississauga, Ontario L4Z 1W7
Tel: (905) 890-2113
Fax: (905) 890-5338
TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
iv
CERTIFICATION SUMMARY
Summary of DO-160C Environmental Testing for Technisonic Model TFM-550, Low-band VHF, High-
band VHF and UHF Transceiver:
Conditions Section Description of Conducted Tests
Temperature and Altitude 4.0 Equipment tested to categories B2 and D1.
Vibration 8.0 Equipment is tested without shock mounts to
categories B, M and N.
Magnetic Effect 15.0 Equipment is class A.
Power Input 16.0 Equipment tested to category B.
Voltage Spike 17.0 Equipment tested to category B.
RF Emission 21.0 Equipment tested to category Z.
INSTALLATION APPROVAL NOTE
Presently, no TSO standard exists for airborne FM transceivers. To make it easier for installation
agencies to provide their customers with an approved installation supported by an effective Airworthiness
Approval, Technisonic has secured Supplemental Type Certificate (STC) Approvals (both US and
Canadian) on its Airborne FM products for many helicopters currently being delivered in the US and
Canada as well as a number of single engine fixed wing aircraft. The above referenced DO-160C test
data is also on file and available from Technisonic to support approval requirements in airframes for which
Technisonic does not possess an STC.
Approved aircraft types are listed in the attachments to the formal STC documents. These STCs are the
exclusive property of Technisonic and require the written authority of Technisonic for their use. To assist
Factory Authorized Technisonic Dealers in the certification process, we have placed copies of our
Canadian and US STCs on our web site along with a letter of authorization for their use. These
documents may be downloaded and used as support for the technical submission to FAA or Transport
Canada. Only authorized factory dealers/installers are permitted to download and make use of these
documents on behalf of their customers (end users) in support of regulatory agency approval. Please
refer to the Technisonic web site www.til.ca for the latest issue of available STCs and letter of
authorization for use.
TECHNISONIC INDUSTRIES LIMITED
www.til.ca
TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
v
TABLE OF
CONTENTS
SECTION TITLE PAGE
SECTION 1 GENERAL DESCRIPTION
1.1 INTRODUCTION ...................................................................................................................... 1-1
1.2 DESCRIPTION ......................................................................................................................... 1-1
1.3 PURPOSE OF EQUIPMENT ................................................................................................... 1-1
1.4 MODEL VARIATION ................................................................................................................ 1-1
1.5 TECHNICAL SUMMARY ......................................................................................................... 1-2
SECTION 2 OPERATING INSTRUCTIONS
2.1 FEATURES .............................................................................................................................. 2-1
2.2 OPERATING INSTRUCTIONS ................................................................................................ 2-3
2.3 PROGRAMMING INSTRUCTIONS ......................................................................................... 2-5
2.4 PRIORITY SCANNING, SELECTIVE MEMORY CHANNEL SCANNING AND SCAN LISTS 2-6
2.5 SCANNING FUNCTION ........................................................................................................... 2-6
2.6 DIRECT FREQUENCY ENTRY MODE ................................................................................... 2-6
2.7 RECEIVE FREQUENCY SIMPLEX FUNCTION ...................................................................... 2-7
2.8 KEYBOARD LOCKOUT FUNCTION ....................................................................................... 2-7
2.9 VARIABLE FREQUENCY MODE FUNCTION ......................................................................... 2-7
2.10 LED DISPLAY VARIABLE DIMMING MODE ........................................................................... 2-7
2.11 90 SECOND TRANSMITTER TIMEOUT FEATURE ............................................................... 2-7
2.12 PROGRAMMING CTCSS TONES/DPL CODES ..................................................................... 2-7
2.13 CROSS BAND REPEAT .......................................................................................................... 2-7
2.14 PC MEMORY/PROGRAMMING DOWNLOAD CAPABILITY .................................................. 2-9
SECTION 3 INSTALLATION INSTRUCTIONS
3.1 GENERAL ................................................................................................................................ 3-1
3.2 EQUIPMENT PACKING LOG .................................................................................................. 3-1
3.3 TRANSCEIVER INSTALLATION ............................................................................................. 3-1
3.4 INSTALLATION KIT - CONTENTS .......................................................................................... 3-1
3.5 ANTENNA INSTALLATION ...................................................................................................... 3-1
3.6 INSTALLATION - PIN LOCATIONS AND CONNECTIONS .................................................... 3-1
3.7 WIRING INSTRUCTIONS ........................................................................................................ 3-3
3.7.1 MAIN POWER +28VDC ........................................................................................................... 3-3
3.7.2 MAIN GROUND ........................................................................................................................ 3-3
3.7.3 PTT (GROUND KEYING) ......................................................................................................... 3-3
3.7.4 FRONT PANEL BACK LIGHTING ........................................................................................... 3-5
3.7.5 AUDIO OUTPUTS (600 AND 4 OHMS) ................................................................................... 3-5
3.7.6 AUDIO OUTPUT GROUND ..................................................................................................... 3-5
3.7.7 MIC SIGNAL INPUT ................................................................................................................. 3-5
3.7.8 MEMORY UP/MEMORY DOWN .............................................................................................. 3-5
3.7.9 DATA INPUT ............................................................................................................................ 3-5
3.8 INTERNAL PROGRAMMING ENABLE/DISABLE JUMPER ................................................... 3-5
3.9 TRANSMITTER POWER ADJUSTMENTS .............................................................................. 3-7
3.10 TRANSMITTER MICROPHONE LEVEL ADJUSTMENT ........................................................ 3-7
3.11 SQUELCH ADJUSTMENT ....................................................................................................... 3-7
3.12 TRANSMITTER DEVIATION ADJUSTMENT .......................................................................... 3-9
TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
vi
APPENDIX
Post Install EMI Tests ............................................................................................................... A-1
LIST OF FIGURES
FIGURE TITLE PAGE
2-1 TFM-550 OPERATOR'S SWITCHES AND CONTROLS ......................................................... 2-2
2-2 TFM-550 TRANSCEIVER PC UP/DOWNLOAD CABLE - WIRING DIAGRAM ....................... 2-9
3 TRANSCEIVER MOUNTED VIEW OF A 15-PIN FEMALE & 9-PIN MALE CONNECTOR .... 3-1
3-1A OUTLINE DRAWING FOR MODEL TFM-550 TRANSCEIVER ............................................... 3-2
3-1B LOW PASS FILTER OUTLINE DRAWING AND INSTALLATION DETAIL ............................. 3-3
3-2 WIRING CONNECTIONS FOR THE TFM-550 TRANSCEIVER ............................................. 3-5
3-3 INTERNAL ENABLE/DISABLE JUMPER LOCATIONS .......................................................... 3-7
3-4 EXTERNAL ADJUSTMENT ACCESS HOLES ........................................................................ 3-9
3-5 DEVIATION ADJUSTMENT POTENTIOMETER LOCATION ................................................. 3-11
3-6 DEVIATION ADJUSTMENT POTENTIOMETER LOCATION ................................................. 3-12
3-7 VHF LOW DEVIATION ADJUSTMENT POTENTIOMETER LOCATION ................................ 3-13
LIST OF TABLES
TABLE TITLE PAGE
2-1 AVAILABLE CTCSS TONES ................................................................................................... 2-7
2-2 USABLE AND UNIQUE OCTAL 3 DIGIT DPL/DCS ................................................................. 2-7
3-1 WIRE CONNECTIONS ON A 15 PIN FEMALE D CONNECTOR ............................................ 3-4
3-2 WIRE CONNECTIONS ON A 9 PIN MALE D CONNECTOR................................................... 3-4
TECHNISONIC INDUSTRIES LIMITED
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
1-1
SECTION 1 - GENERAL
DESCRIPTION
1.1 INTRODUCTION
This publication provides operating and installation information on the TFM-550 Transceiver
manufactured by Technisonic Industries Limited. The unit offers an extended frequency range
with selectable channel spacing and is intended for use (in the U.S.) only by government
agencies or contractors thereto, who have obtained licensing for operation in the 138-150 MHz
portion of the VHF band. If the TFM-550 transceiver is used in CANADA, VHF operation is
restricted to the following sub bands: 138-144, 148-148.99, 149.005-150.005 and 150.05-174
MHz. The UHF band is only authorized to operate in the following part 90 mobile and land mobile
frequency bands:
406.1 – 410.0 MHz 456.0 – 460.0 MHz 467.7375 – 470.0 MHz
410.0 – 420.0 MHz 460.0 – 462.5375 MHz 470.0 – 512.0 MHz
450.0 – 454.0 MHz 462.7375 – 467.5375 MHz
It is a violation of FCC rules if the device operates on unauthorized frequencies.
Do not use the TFM-550 in the frequency band 406.0 MHz – 406.1 MHz. This frequency band is
reserved for distress beacons.
Furthermore the TFM-550 is a frequency agile transceiver which is restricted to airborne use and
must not be operated as a base station in Canada.
1.2 DESCRIPTION
The TFM-550, Transceiver is a frequency agile, fully synthesized airborne FM transceiver
capable of operating in the 30 to 50 MHz, 138 to 174 MHz and 403 to 512 MHz frequency range
in 2.5 kHz increments with either 25 kHz or 12.5 kHz channel spacing. The Transceiver can
operate without restriction on any split frequency pair in either band.
The TFM-550 Transceiver provides 200 operator accessible memory positions per band, each of
which is capable of storing a transmit frequency, receive frequency, transmit frequency CTCSS
tone or DPL code, receive frequency CTCSS tone or DPL code, an alphanumeric identifier for
each channel and wideband (25 kHz) or narrowband (12.5 kHz) channel spacing assignment.
Operating frequency and other related data are presented on a 96 character, four-line LED matrix
display. Data entry and function control are performed via a 12 button keypad. Preset channels
may also be scrolled and scanned (scanning only possible in VHF high and UHF bands) through
keypad function activation. Data may also be entered via computer with the provided software
and optional PC Up/download cable, P/N 993390-1.
1.3 PURPOSE OF EQUIPMENT
The TFM-550, VHF High/VHF Low/UHF Band FM Transceiver is designed to provide secondary
airborne communications to facilitate operations which are typically performed in a low altitude
environment. The transmitter sections of this unit have a minimum of 8 watts and do not exceed
10 watts output power, which may be reduced by a front panel switch to 1 watt, in order to reduce
interference to land based systems.
1.4 MODEL VARIATION
There are four variations of the Model TFM-550 Transceiver. All units offer identical features and
performance except for the following differences:
TFM-550, P/N 991095-1 GREEN display and 28 Volt back lighting.
TFM-550, P/N 991095-1 (5V) GREEN display and 5 Volt back lighting.
TECHNISONIC INDUSTRIES LIMITED
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
1-2
TFM-550, P/N 991095-2 RED display and 28 Volt back lighting.
TFM-550, P/N 991095-2 (5V) RED display and 5 Volt back lighting.
Both P/N's 991095-1 and 991095-2 are always provided with 28 volt back lighting unless a
specific request is made for 5 Volt AC operation.
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
1-3
1.5 TECHNICAL CHARACTERISTICS
Specification Characteristic
GENERAL
Model Designation:
Frequency Range:
Tuning Increments:
Operating Mode:
Channel Spacing:
Physical Dimensions:
Weight:
Mounting:
Operating Temperature Range:
Power Requirement:
Voltage:
Current:
Frequency Selection:
CTCSS squelch/encoder:
DPL1 digital squelch/encoder:
DTMF encoder:
Audio Outputs:
Speaker Output:
Back Lighting:
Display Colour:
TFM-550
30 to 50, 138 to 174
and 403 to 512 MHz
2.5 kHz
F3E simplex or semi-duplex
25 or 12.5 kHz
Approx. (L) 8.0" x (W) 5.75" x (H) 3.75"
Approx. 5.1 Lbs (2.3 Kg)
Panel Mount via Dzus fasteners
-45° C to +70° C
28.0 VDC ± 15%
Receive - 1.2 A Max.
1-Watt Transmit - 2.2 A Max.
8-10 Watt Transmit - 3.4 A Max.
8-10 Watt Dual Transmit - 5 A Max.
200 memories per band programmed with:
a) Tx Frequency/Rx Frequency
b) Tx/Rx CTCSS tone or DPL code
c) 9-character alphanumeric title
All CTCSS tones available
All standard DPL codes
All standard DTMF tones
0.5 Watts into 600
2.5 Watts min. into 4
28 Volts (standard) or 5 Volts (specify)
Green (standard) or Red (specify)
1 DPL is a trademark of Motorola Corporation
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
1-4
1.5 TECHNICAL CHARACTERISTICS (continued)
Specification Characteristic
VHF RECEIVER
Sensitivity at 12 dB SINAD
Adjacent Channel Selectivity
Spurious Attenuation
Third Order Intermodulation
Image Attenuation
FM Acceptance
Hum and Noise
Audio Distortion
Antenna Conducted Emission
Better than 0.35 µV
-75 dB (25 kHz)
-70 dB (12.5 kHz)
-90 dB
-70 dB
-80 dB
±6 kHz
Better than 45 dB
less than 5%
less than -70 dBm
UHF RECEIVER
Sensitivity at 12 dB SINAD
Adjacent Channel Selectivity
Spurious Attenuation
Third Order Intermodulation
Image Attenuation
FM Acceptance
Hum and Noise
Audio Distortion
Antenna Conducted Emission
Better than 0.35 µV
-70 dB (25 kHz)
-60 dB (12.5 kHz)
-80 dB
-70 dB
-60 dB
±6 kHz
Better than 40 dB
less than 5%
less than -70 dBm
VHF LOW RECEIVER
All specifications identical to VHF receiver
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
1-5
VHF, VHF LOW and UHF TRANSMITTER
RF Power Output
Output Impedance
Maximum Deviation
(In narrowband mode)
Spurious Attenuation
Frequency Stability
Microphone Circuit
Sidetone Output
Harmonic Attenuation
FM Hum And Noise
Audio Input
Audio Distortion
1-Watt or 10-Watts
50
±5 kHz (25 kHz mode)
±2.5 kHz (12.5kHz mode)
-90 dB below carrier level
±2.5 ppm (-30ºC to +55ºC)
±2.6 ppm (-45ºC to -30ºC, +60º to +70ºC)
Carbon or equivalent
0.5W (max) into 600
-60 dB below carrier level
-40 dB
50 mV at 2.5 kHz into
200
input circuit for
±3.5kHz deviation, adjust.
Less than 5%
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
2-1
SECTION 2 – OPERATING
INSTRUCTIONS
2.1 FEATURES
The equipment has several important operating features which provide maximum flexibility,
performance and versatility. These features include:
1. The UHF band can be configured to be operated independently of the VHF High and VHF
Low bands or all three bands can operate as a single unit.
2. The unit can be set up as a cross band repeater, linking a VHF High and UHF frequency
in both directions. The VHF Low band will not cross band repeat.
3. 200 memory positions per band which can each be programmed with a transmit and
receive frequency with 25 or 12.5 kHz channel spacing, Tx/Rx CTCSS tones or DPL
codes and a 9-character alphanumeric title.
4. Scanning of preprogrammed memories with selective memory scanning, in up to 5 scan
lists, for the VHF High or UHF band. The VHF Low band does not scan.
5. Priority scan of memory channel 1 in VHF high or UHF band. The Scan function can only
be used for one of these bands at a time. Simultaneous scanning on both bands is not
possible.
6. Direct frequency entry mode.
7. Receive frequency simplex function. (Repeater talk around)
8. Switchable RF output power between 1 watt and 8-10 watts.
9. Lockout of keyboard to prevent inadvertent entries.
10. Variable frequency mode to manually scan up and down in 1 MHz, 100 kHz or 2.5 kHz
steps.
11. LED display variable dimming mode.
12. Selectable 90 second Tx time out feature.
13. PC Memory Upload or Download capability.
14. Configuration Menu: Pressing ENTER, RCL and FUNC together, while turning the radio
on, will put it into configuration mode. The programming features affected are:
a) DPL - Can be turned on or off with the MUP and MDN (4 and 7) keys.
This only removes the DPL entry step from the programming
sequence and does not stop memories that already have DPL
codes from working. This also applies to the rest of the on/off
configurable items.
b) Scan - Can be disabled. Selecting FUNC and SCAN will do nothing if
Scan is off. The scan list indicator (+) will still display if was
previously programmed.
c) Rx CTCSS - Can be turned on or off from the programming sequence. This
affects only the CTCSS tones for receive.
d) LAST MEM - If set to on, the last memory channel on the display will be what
comes up when the radio is turned on. If set to off, the last
memory that changes were made to will be what comes up
when the unit is switched on.
e) DUALMODE - If set to ON, the UHF band is operated independently from the 2
VHF bands. (Example: UHF audio separately available on 9 pin
connector). The radio is shipped with this feature OFF.
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
2-2
f) REMOTE BS - Only used when an RC-550 slave control head is attached.
Setting this feature on will give the transmit selection to the
Band Select switch on the RC-550 rather than on the radio. This
is useful when the operator at the RC-550 is using the VHF high
and low bands. Regardless of whether this feature is set to on
or off, the fourth squelch light will light on both units when both
BS switches are set to the same position.
g) SIDETONE - The TX audio circuit becomes active allowing you to adjust the
sidetone level with the VHF volume knob. When the desired
level is reached, press ENTER and this level will be set for both
VHF and UHF bands. The factory setting is 23.
NOTE: The sidetone level must be set every time you go
through the configuration menu since it takes the setting of the
volume knob regardless of whether you set it or not.
FIGURE 2-1 TFM-550 Operator's Switches and Controls
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
2-3
2.2 OPERATING INSTRUCTIONS (See Figure 2-1)
1. Switch power on by turning the VHF volume clockwise. Depending how the radio is
configured, either the last programmed or last displayed frequencies will appear on the
screen. The transceiver is now in normal operating mode.
NOTE: VHF high band will be referred to as “VHF” and VHF low band as “VLO” in these
instructions.
2. Adjust the audio level by adjusting the VHF, UHF and VLO volume knobs.
3. Pressing the squelch defeat button will open all receivers to confirm they work.
4. Read the display. The top line will indicate which VHF memory is selected followed by a
"+" if the memory position is included in a scan list, an alphanumeric message, and the
frequency of the VHF receiver. A small "n" before the frequency indicates 12.5 kHz
narrowband channel spacing is in effect on this memory position. In the receive mode,
the frequency is followed by an "RT" if an RX CTCSS tone or RX DPL code is
programmed, or an "RX" if no receive tone/code is programmed. Similarity, in the
transmit mode either a "TT" or "TX" is shown after the frequency. The second line shows
the same information for the UHF band. The third line indicates the same information
about the VHF LOW band.
5. Set the VHF/UHF/VLO (BS) switch to the desired band.
6. The VHF/PRI switch is spring loaded and is normally in the VHF position. Pressing this
switch down will result in channel 001 being loaded on the VHF band.
7. Set the HI/LO switch to the desired RF output power.
8. Select the desired memory by using the M.UP and M.DN buttons, or the RCL button and
a three digit number followed by ENTER.
9. To transmit DTMF tones, use the keyboard keys while holding the PTT button on the
microphone. There is a 5 second PTT delay after pressing a key so that you may press
several DTMF keys in sequence without having to hold the PTT. The keyboard returns to
its normal function when the PTT is released.
The display always shows the status of both receivers and the transmitter. The light at the left of
each line indicates which receiver is receiving. The display also indicates the memory channel is
in use. A "TX" (no TX tone/codes programmed) or "TT"(either TX tone or code programmed) on
the right side of the display indicates which band is active when transmitting. The transmit
frequency is also shown. In the receive mode the display shows “RX” beside the receive
frequency if no RX tone or DPL code is programmed and “RT” if a CTCSS tone or DPL code is
programmed.
While in any programming mode, all receivers continue to function. When the transceiver is in
either of the operating frequency or CTCSS tone/DPL code programming modes and you must
respond to a call, click the microphone PTT once (the radio will not transmit during this click). This
will cause the transceiver to revert back to the normal operating mode and communications with
the caller can proceed in the usual fashion. Pressing the FUNC key has the same effect.
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
2-4
2.3 PROGRAMMING INSTRUCTIONS
To program one of the 200 memory channels in one of the bands:
1. Select the desired band on the band select (VHF/UHF/VLO) switch. This is required
before any of the programming modes or functions.
2. Press the FUNC key. The display will show the function prompt.
3. Press the PROG key. The display will show the current receive frequency with a flashing
curser on the first or second digit. (The first digit is always a one <1> on the VHF band
and there is no hundreds digit on the VHF LOW band).
4. Type in the desired receive frequency. If you type in a frequency which is not a 2.5 kHz
step, the nearest valid frequency will be automatically selected.
5. The curser will return to the second digit. You can retype the frequency if you have made
an error or press ENTER to continue.
6. The transmit frequency will be displayed with the curser on the second digit. Follow the
same method as in step 4 and 5.
7. The channel spacing increment of either 25.0 or 12.5 kHz is now displayed. Use the M.UP
and M.DN keys to select the desired channel spacing for the memory position, then press
ENTER.
8. The alpha-numeric title is now displayed. Use the M.UP and M.DN keys to scroll through
the alphabet, numbers and symbols. When the desired character is displayed, press
ENTER to advance to the next character. Press “1" to backspace.
9. Keep repeating step six until the last space is set (there are 9 characters). The display will
show SCAN or LOCKOUT to enable this memory position as part of a scan list or lock it
out of the scan lists. Use the 1,2,3,4,5 and M.DN keys to toggle between these functions
(for details see paragraph 2.5). Once the desired condition has been selected, press
ENTER. The TFM-550’s display will show a "+" beside the memory channel number if
scan is enabled.
NOTE: Scan function and Scan list feature not provided for VHF Low Band.
10. The display will now show the current memory number. Type in the 3 digit number of the
memory you want to save to (if different from displayed one) and press ENTER.
2.4 PRIORITY SCANNING, SELECTIVE MEMORY CHANNEL SCANNING AND SCAN
LISTS
Instead of breaking up the 200 channels into blocks for scanning, the TFM-550 has 5 scan lists
per band (VHF high and UHF only). Any of the 200 channels can be assigned to any one or more
of these 5 scan lists. This means the channels do not have to be repeated for them to be in more
than one block and that you are not limited to the number of channels that can be scanned at
once, since all 200 channels can be put into any scan list.
NOTE: Scanning is not available on the VHF Low band.
The priority memory channel is always memory position number 1. The priority memory channel
is scanned every other step to ensure that no incoming messages are missed. (Example:
121314151...) The priority channel can be locked out, which will result in the normal scanning of
the other memory positions.
Selective memory scanning allows the user to select which of the 200 memory channels are to be
scanned or locked out when the scan function is invoked. To use this feature, follow
PROGRAMMING INSTRUCTIONS found in paragraph 2.3. Once the screen displays SCAN or
LOCKOUT, use the 1,2,3,4,5 or M.DN keys to toggle to the desired condition and press ENTER.
Entering the any or all of the numbers 1,2,3,4 or 5 will include that memory channel in any of the
five scan lists. In normal operating mode, the display will later show a "+" beside the memory
channel number if it has been included in any of the 5 scan lists.
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2.5 SCANNING FUNCTION (5 second talkback delay)
Select the band you wish to scan with the band switch. (You can not scan VHF Low band). To
start scanning of the memory channels, press FUNC then SCAN and then the number (1,2,3,4,5)
of the desired scan list.
The radio will scan through all the preset memory positions in the selected scan list (see above
paragraph for priority and selective scan features) and will lock on to the first active channel in the
scan sequence. It will remain on the channel until it becomes inactive. Scanning will resume again
after five seconds of inactivity. To exit the scan mode, press the SCAN key. This will cause the
radio to revert back to the normal operating mode.
If while scanning, you hear a call for you:
1. Respond to the call within 5 seconds. When scanning is interrupted by an incoming
signal, the channel will remain open for five seconds before resuming scanning.
2. During communications the five second timer is reset from the last Rx or Tx signal
encountered.
The radio resumes scanning once the Rx or Tx activity has ceased for more than five seconds.
The SCAN key must be pressed to exit the scan mode.
2.6 DIRECT FREQUENCY ENTRY MODE
This mode is designed to facilitate quick frequency selection during emergency and other
operational conditions requiring direct operating frequency selection. This operating mode is
disabled along with the programming mode when the internal disable jumper is set.
1. When the transceiver is in the normal operating mode, press FUNC and the desired
operating frequency. Example: 153.2750.
2. On the UHF band press FUNC and then 1 and the desired frequency. Example:
443.5500.
3. You will then be asked for 12.5 or 25.0 kHz channel spacing. Select with MUP or MDN
and press ENTER.
Please note in the above operation, after FUNC and "1" are entered, the LED display will show
memory channel "000" and then the remaining digits in the desired frequency are shown as they
are entered. No alphanumeric message can be entered in this mode. Operation on the new
frequency occurs in both transmit and receive (simplex only) modes. If RX or TX CTCSS
tones/DPL codes are required they must be programmed in afterwards.
2.7 RECEIVE FREQUENCY SIMPLEX FUNCTION (Repeater talk around)
The receive frequency simplex function allows you to quickly change the transmit frequency,
when operating on a split pair (repeater/semi-duplex mode), to the receive frequency to allow
direct communications. Example: If you are transmitting on 152.000 MHz and receiving 152.555
MHz, select VHF on the band select switch and press FUNC then UP to transmit on 152.555
MHz. To return to the split pair condition, you must recall the memory channel again. This is
quickly done by pressing M.UP for one step up, then back down one step with the M.DN key.
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2.8 KEYBOARD LOCKOUT FUNCTION
The keyboard can be locked out so that accidental pressing of keys does not change frequency,
etc., unknowingly to the operator. To lock the keyboard, press FUNC then LOCK. This will disable
all keyboard functions (except keyboard unlock) in the receive mode. The DTMF function during
transmit will not be affected. To unlock the keyboard, press and hold the LOCK key for two
seconds until the display indicates "UNLOCK".
2.9 VARIABLE FREQUENCY MODE FUNCTION
To enter variable frequency mode, press RCL, 0,0,0, then ENTER or enter a frequency in the
direct entry mode described above. The memory channel that you were just in will still be valid,
but now you can manually adjust the frequency with the M.UP, M.DN, UP and DN keys. The UP
and DN keys will make the frequency count up or down in steps of 2.5 kHz. The M.UP and M.DN
keys will make the frequency count up or down in steps of 1 MHz. You can not change the label.
The frequency in this mode cannot be stored in memory. To exit this mode, recall one of the 200
memory channels. (Example: RCL, 0,0,1). Variable frequency mode is disabled when the internal
entry disable jumper is removed.
2.10 LED DISPLAY VARIABLE DIMMING MODE
1. With the transceiver in normal operating mode press the UP or DN keys to increase or
decrease the intensity of the LED display.
2. Once maximum intensity of the display is achieved, the UP key no longer functions. Conversely
once minimum intensity is reached, the DN key ceases to function.
2.11 90 SECOND TRANSMITTER TIME OUT FEATURE
A selectable 90 second transmitter time out feature is provided to prevent accidental continuous
transmission in the event of a faulty PTT switch. With this feature enabled the transceiver will stop
transmitting after the PTT is engaged continuously for 90 seconds. The timer is reset by releasing
then re-engaging the PTT switch.
Press the FUNC then the M.UP key. Use the M.UP and M.DN keys to select 90 SEC, which
enables the feature, or NONE which disables it.
2.12 PROGRAMMING CTCSS TONES/DPL CODES
CTCSS tones (PL tones) or Digital DPL codes can be assigned to each memory channel on any
of the three operating bands. To program a tone/code to a memory channel:
1. Select the desired band on the band select switch.
2. Use the M.UP and M.DN keys to select the memory channel that you want to assign a
CTCSS tone or DPL code.
3. Press the FUNC key then the TONE key. The display will show "RX TONE:" and the current
tone number, as well as the tone frequency in Hz.
4. Use the M.UP and M.DN keys to select the tone number you require. See Table 2-1 for a list
of the available CTCSS tones.
5. Press ENTER. "TX TONE" appears on the display. Repeat step 3.
6. The display will now show "RX DPL:" and the current 3 digit DPL code. If no DPL code is
required "000" should be entered. Please note that if a DPL code is to be programmed a
CTCSS tone should not be enabled.
7. Use the keypad to enter the required octal 3-digit DPL (Digital Coded Squelch or DCS) code.
See Table 2-2 for a list of all usable and unique octal 3 digit DPL/DCS codes.
8. Press ENTER. "TX DPL" appears on the display. Repeat step 6.
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Number Tone Number Tone Number Tone
01 67.0 26 162.2 51 177.3*
02 71.9 27 167.9 52 183.5*
03 74.4 28 173.8 53 189.9*
04 77.0 29 179.9 54 196.6*
05 79.7 30 186.2 55 199.5*
06 82.5 31 192.8 56 206.5*
07 85.4 32 203.5 57 210.7*
08 88.5 33 33.0* 58 218.1*
09 91.5 34 35.4* 59 225.7*
10 94.8 35 36.6* 60 229.1*
11 97.4 36 37.9* 61 233.6*
12 100.0 37 39.6* 62 241.8*
13 103.5 38 44.4* 63 250.3*
14 107.2 39 47.5* 64 No Tone
15 110.9 40 49.2* (carrier squelch only)
16 114.8 41 51.2*
17 118.8 42 53.0*
18 123.0 43 54.9*
19 127.3 44 56.8*
20 131.8 45 58.8*
21 136.5 46 63.0*
22 141.3 47 69.4*
23 146.2 48 159.8*
24 151.4 49 165.5*
25 156.7 50 171.3*
TABLE 2.1 Available CTCSS tones
NOTE: The tones marked with * are non-standard tones.
017* 051 116 156 243 266* 346 431 466 612 721
023 053* 122* 162 244 271 351 432 503 624 731
025 054 125 165 245 274* 356* 445 506 627 732
026 065 131 172 246* 306 364 446* 516 631 734
031 071 132 174 251 311 365 452* 523* 632 743
032 072 134 205 252* 315 371 454* 526* 654 754
036* 073 143 212* 255* 325* 411 455* 532 662
043 074 145* 223 261 331 412 462* 546 664
047 114 152 225* 263 332* 413 464 565 703
050* 115 155 226 265 343 423 465 606 712
TABLE 2.2 Usable and unique octal 3 digit DPL/DCS
NOTE: * indicates GE Digital Coded Squelch (DCS) Code
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2.13 CROSS BAND REPEAT
The TFM-550 can act as a cross band repeater between VHF (high band only) and UHF. To enter
repeat mode, press FUNC and then 9. The status line will show REPEAT instead of the band
switch selection. When a signal is received on one of the bands, the audio is routed to the
transmitter of the other band. This process can only go in one direction at a time. While
transmitting, short bursts of noise due to intermittent signal strength or interference will be muted
while the transmitter continues to transmit. There is also a short delay of silence (tail) after the
received signal ends. The operator at the TFM-550 can monitor communications in both
directions but can only talk to one band at a time via the band select switch. If the radio is set up
in dual mode, the band selection is made at the audio panel. To cancel cross band repeat mode,
press ENTER.
2.14 PC MEMORY PROGRAMMING UP/DOWNLOAD CAPABILITY
The TFM-550 transceiver can be programmed by a Windows based personal computer using
Technisonic software supplied on CD with each TFM-550.
Requirements:
1. PC compatible computer with a CD ROM drive, running Windows 95/98/NT/2000/ME.
2. Bench power supply of 28 volts DC.
3. A PC download cable, P/N 993390-1 which can be supplied or made from the wiring diagram
at the back of this section.
Connections:
1. With the PC turned off, plug the 25 pin male 'D' connector into a serial port.
2. Plug the 9 pin 'D' connector into the back of the TFM-550 transceiver.
3. Connect the power supply to the TFM-550.
Installing the MultiTDP Program:
The CD supplied with each radio contains software for all of Technisonic’s downloadable
transceivers. Place the CD into your drive and use Windows Explorer to open the MultiTDP
directory on the CD. Double-click the MultiTDP_Install.exe file. Follow the onscreen instructions to
install the program onto your hard drive. When the program is installed, it can be run by selecting
Programs from your Start menu, then select Technisonic from the submenu and finally MultiTDP.
Using the MultiTDP Program:
With the program running on your computer, a full MultiTDP instruction manual can be loaded by
selecting Documentation in PDF format under the Help menu. Otherwise, to get started, pull down
the File menu and select TFM-550. The program defaults to serial port com1 but can be set to
com 2, 3 or 4 under the Com Port menu. The program is now ready to use. You may want to
upload data from the radio and edit channels or start a new data file. The VHF and UHF bands
are treated as separate radios and must be up or downloaded and edited separately. Editing is
done on a channel by channel basis. Set the channel number you would like to edit and then
modify the frequencies, labels, CTCSS tones, DPL codes, wide / narrow band setting and scan
lists as desired. Press the Save Record button to store the changes you’ve made to the data base
below. After you have edited the channel list your can save your changes to disk and/or download
to the radio. Only channels selected with a check mark will download. It is recommended to use
the Select All command in the Data Transfer menu to ensure the data base in the radio matches
the one in the PC. When download is selected, a message box will appear on your screen asking
you to press FUNC and DN on the radio. Press these buttons on the radio before you click OK in
the message box, otherwise the download will fail.
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TFM-550 Upload/Download Programming Cable
P/N 993390-1 Wiring Diagram
FIGURE 2-2 TFM-550 Transceiver PC Up/Download Cable - wiring diagram
NOTE: If your serial port is a 9 pin connector instead of the 25 pin, use a female 9 pin D
connector, connecting:
Yellow - pin 3
Blue - pin 2
Black - pin 5
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SECTION 3 – INSTALLATION INSTRUCTIONS
3.1 GENERAL
This section contains information and instructions for the correct installation of the TFM-550,
VHF/FM Transceiver.
Make certain that the correct frequencies are pre-programmed in accordance with the equipment
user's valid FCC operator's license, prior to installation.
3.2 EQUIPMENT PACKING LOG
Unpack the equipment and check for any damage that may have occurred during transit. Save
the original shipping container for returns due to damage or warranty claims. Check that each
item on the packing slip has been shipped in the container. Verify that the equipment display and
backlighting configuration are the same as those ordered.
3.3 TRANSCEIVER INSTALLATION
The TFM-550 Transceiver is designed to be Dzus mounted and should be installed in conjunction
with an IN-550 installation kit. See Figure 3-1a for an outline drawing of the unit with dimensions
to facilitate the installation.
3.4 INSTALLATION KIT - CONTENTS
The IN-550 installation kit consists of:
1. One 15 pin Cannon D mating connector (female) complete with crimp pins and hood.
2. One 9 pin Cannon D mating connector (male) complete with crimp pins and hood.
3. Three BNC antenna mating RF connectors (male).
3.5 ANTENNA INSTALLATION
Antenna, Comant P/N CI-292-3 or suitable equivalent, may be utilized for VHF. Antenna, Comant
P/N CI-275 or suitable equivalent, may be utilized for UHF and the Foxtronics model FLX-3050B
antenna/tuning system or Sensor Systems P/N S65-8282-34 may be utilized for the VLO band. A
suitable whip antenna cut for a specific VLO frequency may also be used. The antenna gain of
any above antennas for any band may not exceed a maximum gain of 3 dBi. The antennas shall
be mounted on the bottom of the aircraft whenever possible and must not be co-located (kept at a
separation distance of more than 20cm from each other when installed). Also they must be installed in
such a way that they always maintain a separation distance of more than 90cm (36 inches) from any
occupant in the airframe during operation. Consult with instructions provided with the antennas.
Connect RF cables from antennas to the back of the TFM-550 unit by utilizing the BNC mating
connector provided in the installation kit. The VHF Low band (top) and UHF (middle) BNC
connectors are located on the rear, above the 15 pin D connector and the VHF high band BNC
connector is below the 9 pin D. If an external antenna tuner (ATU) is to be used, the ATC-550
(P/N 991102-1) will have to be utilized to control it. The ATC-550 is an external box to the TFM-
550. See Figure 3-1b.
3.6 INSTALLATION - PIN LOCATIONS AND CONNECTIONS
The pin numbers and locations for the 15 pin and 9 pin Cannon D located on the rear of the TFM-
550 transceiver are shown below. Pin connections are listed in TABLES 3-1 and 3-2.
FIGURE 3 15 pin female and 9
pin male connector
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FIGURE 3-1a Outline Drawing for Model TFM-550 Transceiver
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FIGURE 3-1b Low Pass Filter Outline Drawing and Installation Detail
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3.6 INSTALLATION - PIN LOCATIONS AND CONNECTIONS (continued)
TFM-550 Transceiver
15 Pin D Connections
Pin # Description
1 600
Output 1
2 Data Output
3 Panel Lighting (28VDC or 5VAC)
4 Memory Up
5 Memory Down
6 Mic Signal Input 1
7 Main Power +28VDC
8 Main Ground
9 4 ohm Speaker Output
10 4 ohm/600 ohm Output Ground
11 Data Input
12 DF Audio
13 PTT 1 (Ground Keying)
14 Main Power +28VDC
15 Main Ground
TABLE 3-1 Wire connections on a 15 Pin FEMALE D Connector
TFM-550 Transceiver
9 Pin D Connections
1 600
Output 2 (UHF Band in Dual Mode)
2 PTT 2 (Ground Keying)
3 Reset
4 Background Debug Signal
5 Ground
6 Programming Voltage In
7 Serial Data Out
8 Serial Data In
9 Mic Signal Input 2
TABLE 3-2 Wire connections on a 9 Pin MALE D Connector
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Figure 3-2 Wiring connections for the TFM-550 Transceiver.
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3.7 WIRING INSTRUCTIONS
Figure 3-2 shows all required connections and recommended wire sizes for the TFM-550
Transceiver. If problems with the correct operation of the UHF/FM Transmit function of a TFM-
550 are encountered on a specific airframe, a DC power line filter may be required. Typical
problems encountered are that UHF/FM will not transmit on high power or will not open a
repeater when using a CTCSS transmit tone. Investigation has determined that once the ripple on
the airframes DC (28V) power line becomes excessive, the UHF transmit function and tones will
distort. If the airframes generators are turned off and the UHF/FM transmit function works
correctly from 28 Vdc battery power, the ripple on the DC power line is excessive. The use of DC
power line filter PLF250, p/n 021214-1 is recommended and is available from Technisonic.
3.7.1 Main Power +28 VDC
The main power +28VDC (±15%) is connected to pins 7 and 14 of the transceiver. Both pins
should be connected.
3.7.2 Main Ground
Ground connections for the transceiver are made on pins 8 and 15. Both pins should be
connected.
3.7.3 PTT (Ground Keying)
The PTT line is connected to pin 13 and should be floating when the transceiver is in receive
mode, and grounded during transmit mode. The PTT2 input is on pin 2 of the 9 pin connecter.
3.7.4 Front Panel Back Lighting
Front panel back lighting connection should be made on pin 3 of the transceiver. The opposite
end of this lead should be connected to the panel lighting system of the aircraft. Before
connecting, verify the required panel lighting voltage (28VDC or 5VAC) on the transceiver
configuration control label.
3.7.5 Audio Outputs (600 ohms and 4 0hms)
There are two audio outputs available, (1 & 2). 600 ohm audio output 1 has audio from both VHF
bands and the UHF band in single operator mode. When in dual operator mode, 600 ohm output
1 has audio from the VHF High and Low bands only, while the UHF audio will be on the 600 ohm
output 2. None of these outputs need to be terminated if left unused.
3.7.6 Audio Output Ground
Pin 10 is the ground for both the 4 ohm and 600 ohm audio output signals.
3.7.7 Mic Signal Input
The microphone input signal is to be provided on pin 6, utilizing shielded wire with the shield
grounded to pin 10. Microphone signal 2 is on pin 6 of the 9-pin D connector.
3.7.8 Memory Up/Memory Down
Remote scrolling through the 200 memory positions can be achieved by providing a ground to
pins 4 (up) and 5 (down) through a momentary contact cyclic switch. The memories will scroll
only on the band selected.
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3.7.9 Data Input
Data communications equipment requiring direct access to the modulator and discriminator can
be connected via pins 2 and 11. Data cannot be transmitted in CANADA unless equipment is
approved for use with the TFM-550 by the communications regulatory authority.
3.8 INTERNAL PROGRAMMING AND GUARD ENABLE/DISABLE JUMPER
The programming and direct frequency entry modes can be disabled by removing the internal
enable/disable jumper strap from pins 1 and 2 of J10. Removal of this jumper will prevent
operation on any frequencies other than those programmed in the 600 memory positions. The
transceiver is always shipped with the two jumpers in the entry enable positions. To place either
of the jumpers in the disable position:
1. Remove the left side of the radio.
2. Set or remove jumpers as necessary.
3. Re-install the left side cover.
Microprocessor Control Unit (MCU) PCB Module
FIGURE 3-3 Internal Enable/Disable Jumper Locations
(The Guard Entry Disable Jumper has no effect to the TFM-550)
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3.9 TRANSMITTER POWER ADJUSTMENTS
The transmitter power is adjusted to a maximum of 10 watts in high power mode, and 1 watt in
low power mode over the transceiver operating bandwidth at the factory. If transmitter RF power
readjustment is required, perform as follows:
1. Select the band that you wish to adjust on the band select switch.
2. Connect an RF through-line watt meter to the appropriate antenna connector. Set the
operating frequency to 156.000 MHz for VHF or 457.000 MHz for UHF and key the
transmitter.
3. In low power mode, set the low power adjustment potentiometer on the left side of the
chassis to produce 1.0 watt of RF output power (See Figure 3-4).
4. In high power mode, set high power adjustment potentiometer on the left side of the chassis
to produce 9.5 watts of RF output power.
5. Verify that the RF output power is between 9 and 10 watts on 138.000 MHz, and 174.000
MHz for VHF or 403.000 MHz, and 512.000 MHz for UHF.
3.10 TRANSMITTER MICROPHONE LEVEL ADJUSTMENT
1. Set the transceiver operating frequency to 156.000 MHz and connect an appropriate test
receiver to the RF output connector. Ensure that the output of the transceiver is terminated
into a proper dummy load.
2. Key the transmitter and input a -10 dBm (0.25 VRMS), 1 kHz audio signal into the
microphone input.
3. Adjust the microphone level potentiometer (Mic Level 1) through the access hole located on
the right side of the chassis (see Figure 3-5) to produce a 2.7 kHz deviation.
4. Verify that the deviation is at least 2.3 kHz on the following frequencies: 138.000 MHz,
162.000 MHz and 174.000 MHz.
5. For UHF, perform the same procedure using the Mic Level 2 pot on the left side of the
transceiver and use the following frequencies: 403.000 MHz, 457.000 MHz and 512.000
MHz.
3.11 SQUELCH ADJUSTMENT
The squelch on all receivers is factory set to open at approximately 22 dB SINAD. This
adjustment can be made or altered to suit local conditions as follows:
1. Set the receiver to 157.000 MHz for VHF, 457.000 MHz for UHF or 41 MHz for VHF Low
band. Connect a signal generator to the antenna input of the desired band.
2. Set the signal generator to produce a ±3 kHz deviation with a 1 kHz tone on 157.000 MHz,
457.000 MHz or 41.000 MHz. Increase the signal generator RF level from 0.1 uV until the
squelch indicator LED is on. Verify the squelch opens at the desired level.
3. If not, re-adjust receiver squelch potentiometer through the access hole located on the
bottom of the transceiver chassis (see Figure 3-5).
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FIGURE 3-4 External Adjustment Access Holes
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3.12 TRANSMITTER DEVIATION ADJUSTMENT
VHF:
1. Remove the bottom cover of the transceiver.
2. Set the VHF operating frequency to 157.000 MHz and connect an appropriate test
receiver to the RF output connector. Ensure that the output of the transceiver is
terminated into a proper dummy load.
3. Key the transmitter and input a +10 dBm (2.5 VRMS), 2.5 kHz audio signal into
microphone input 1.
4. Adjust the wideband deviation limit potentiometer, R30 on the VHF Rx/Tx module (see
Figure 3-5) to produce a ±4.20 kHz deviation. Select narrow band mode on the VHF band
and adjust the narrowband deviation limit potentiometer, R76 on the VHF Rx/Tx module
to produce a ±2.10 kHz deviation.
5. Verify that the deviation does not exceed ±5 kHz for wideband and ±2.5 kHz for
narrowband on 138.000 MHz, and 174.000 MHz. Re-adjust R30 or R76 as required, if the
deviation exceeds ±5 kHz or ±2.5 kHz, respectively.
6. Replace the bottom cover.
UHF:
1. Remove the left side cover of the transceiver.
2. Select the UHF band.
3. Set the UHF operating frequency to 457.000 MHz and connect an appropriate test
receiver to the RF output connector. Ensure that the output of the transceiver is
terminated into a proper dummy load.
4. Key the transmitter and input a +10 dBm (2.5 VRMS), 2.5 kHz audio signal into
microphone input 1 if in single mode or microphone input 2 if in dual mode.
5. Adjust the wideband deviation limit potentiometer, R30 on the UHF Rx/Tx module (see
Figure 3-6) to produce a ±4.20 kHz deviation. Select narrow band mode on the UHF
band and adjust the narrowband deviation limit potentiometer, R76 on the UHF Rx/Tx
module to produce a ±2.10 kHz deviation.
6. Verify that the deviation does not exceed ±5 kHz for wideband and ±2.5 kHz for
narrowband on 403.000 MHz, and 512.000 MHz. Re-adjust R30 or R76 as required, if the
deviation exceeds ±5 kHz or ±2.5 kHz, respectively.
7. Replace the bottom cover.
VHF LOW:
1. Remove the top cover of the transceiver.
2. Set the VLO operating frequency to 41.000 MHz and connect an appropriate test receiver
to the RF output connector. Ensure that the output of the transceiver is terminated into a
proper dummy load.
3. Key the transmitter and input a +10 dBm (2.5 VRMS), 2.5 kHz audio signal into
microphone input 1.
4. Adjust the wideband deviation limit potentiometer, R21 on the VLO Rx/Tx module (see
Figure 3-7) to produce a ±4.20 kHz deviation. Select narrow band mode on the VHF band
and adjust the narrowband deviation limit potentiometer, R16 on the VHF Rx/Tx module
to produce a ±2.10 kHz deviation.
5. Verify that the deviation does not exceed ±5 kHz for wideband and ±2.5 kHz for
narrowband on 30.000 MHz, and 50.000 MHz. Re-adjust R21 or R16 as required, if the
deviation exceeds ±5 kHz or ±2.5 kHz, respectively.
6. Replace the top cover.
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VHF Receiver/Transmitter PCB Module
Notes: R30 is for 25 kHz (wideband) Deviation Adjustment
R76 is for 12.5 kHz (narrowband) Deviation Adjustment
FIGURE 3-5 Deviation Adjustment Potentiometer Location
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UHF Receiver/Transmitter PCB Module
Notes: R11 is for 25 kHz (wideband) Deviation Adjustment
R102 is for 12.5 kHz (narrowband) Deviation Adjustment
FIGURE 3-6 Deviation Adjustment Potentiometer Location
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VHF LOW Band Receiver/Transmitter PCB Module
Notes: R21 is for 25 kHz (wideband) Deviation Adjustment
R16 is for 12.5 kHz (narrowband) Deviation Adjustment
FIGURE 3-7 VHF LOW Deviation Adjustment Potentiometer Location
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APPENDIX – TO “INSTALLATION INSTRUCTIONS”
POST INSTALLATION EMI TEST
PURPOSE
The purpose of this test is to identify any interference that the TFM-550 may cause with existing
aircraft systems. As the TFM-550 installation may include the ATC-550 antenna tuner controller,
this test, as required, will also identify any interference caused by the ATC-550.
TEST CONDITIONS
The TFM-550 transceiver and any accessories (e.g., RC-550, ATC-550) should be installed and
function tested. The antenna VSWR should be checked. A forward/reverse power check with a in-
line wattmeter should show no more than 10% reflected power. For the following tests, insure that
the power switch is in the high position.
METHODOLOGY
Most of the EMI tests can be accomplished on the ground. In some cases flight testing is required
or is easier. If the aircraft is approved for IFR operations, then it is mandatory that interference
between the TFM-550 Airborne FM and the approach aids be checked in flight.
The GPS should be operational and navigating with at least the minimum compliment of
satellites. The VHF comm should be set to the frequencies indicated with the squelch open.
VOR/DME receivers should be set to the frequencies indicated and selected for display. If
possible, set up a DME ramp test set on the frequencies indicated and adjust the output until the
flags are out of view. The transponder and encoder should be monitored with ramp test
equipment. Set the output of the transponder test set to 3db above the output necessary to
achieve 90% reply. If possible set the ADF to a nearby navigation station.
Modulate the TFM-550 transmitter on the indicated frequencies for at least 20 seconds.
Observe the GPS for any degradation in satellite status or availability or flags. Listen for any
noise or detected audio signals on the VHF comm(s). Listen for any noise or detected audio
signals on the VOR/LOC receiver audio; look for any moment of flags or needles on the
VOR/LOC/GS navigation display(s). Observe the transponder for any loss of reply or spurious
reply.
List the power plant, fuel and other electric instruments in the chart provided and note any
anomalies that occur while transmitting. Assess the results.
If the aircraft is equipped with an autopilot or a stability augmentation system, then test fly the
aircraft and verify that operation of the TFM-550 transceiver does not have adverse effects on
these systems. After checking for gross effects at a safe altitude, fly an approach with each of the
different navigation systems coupled to the autopilot (ILS, GPS etc.) and look for any anomalies.
When the installation includes the ATC-550 antenna tuner controller, this test (where indicated by
an asterisk “*”) will also identify any interference caused by the ATC-550. In these cases, the
ATC-550 must be turned on and off by means of its breaker as often as required, while
monitoring the victim equipment.
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RESULTS
If the installed system passes all of the applicable EMI tests, then no further action is required. If
interference is observed, then the interference must be assessed against the appropriate
standards of airworthiness for the system in question. For example, it is permissible for a VFR
certified GPS to lose navigation capability while the TFM-550 unit is transmitting, providing that it
recovers properly and promptly. It is not permissible for an IFR Approach certified GPS to be
affected in the same way. A complete discussion of all the standards of airworthiness to be
applied in assessing EMI effects is beyond the scope of this document.
PROCEDURE
A. Operate the TFM-550 transmitter on the following frequency for at least 20 seconds. Observe the
GPS for any degradation in satellite status or availability or flags.
FREQUENCIES GPS #1 GPS #2
TFM-550 PASS FAIL PASS FAIL
39.3850 MHz
143.180 MHz
143.1825 MHz
157.5000 MHz
157.5425 MHz
512 MHz
NOTES:
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B. Determine if the image frequency for the VHF Comm falls within the range of the TFM-550. If so,
select a set of frequencies that will cause the TFM-550 to be set as close as possible to the
image frequency. Any one of the many possible sets will suffice. Record those values in the
spaces provided in the following chart. Modulate the TFM-550 transmitter on the following
frequencies for at least 20 seconds. Listen for any noise or detected audio signals on the VHF
comm.
Example - Bendix/King KY 196A:
The first IF frequency is 11.4 MHz. The L.O. is above the received frequency (high side injection),
therefore the image frequency is 22.8 MHz above the selected frequency. Set the KY 196A to
120.000 MHz and the TFM-550 to 142.8000 MHz.
(Note: Where indicated by an asterisk (*), required action is to switch ATC-550 on and off as often
as necessary.)
FREQUENCIES RESULTS
VHF #1 TFM-550 PASS FAIL
118 34
118 45
135.975 138
121.15 157.5
131.25 157.5
128 *
Image:
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FREQUENCIES RESULTS
VHF #2 TFM-550 PASS FAIL
118 34
118 45
135.975 138
121.15 157.5
131.25 157.5
128 *
Image:
NOTES:
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
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C. Determine if the image frequency for the VOR/ILS Nav falls within the range of the TFM-550. If
so, select two sets of frequencies that will cause the TFM-550 to be set as close as possible to
the image frequency. Choose one set in the localizer frequency range and one in the VOR
frequency range. Record those values in the spaces provided in the following chart.
Establish the relative ultimate sensitivity of the ILS receiver using a NAV simulator, then increase
the simulator signal by 17db. Modulate the TFM-550 transmitter on or as close to the following
frequencies for at least 20 seconds. Listen for any noise or detected audio signals on the receiver
audio; look for any movement of flags or needles on the navigation displays.
A placard is required unless the above test is performed and passed. The placard shall read "Use
of the transmitting function of the TFM-550 in the range of 36 to 40 MHz is prohibited during IFR
approach operations.". This placard must be placed adjacent to the TFM-550 and RC-550 (if
installed). The placard must be high contrast, clearly legible and indelible.
Note: Where indicated by an asterisk (*), required action is to switch ATC-550 on and off as often
as necessary.
FREQUENCIES RESULTS
VOR/ILS #1 TFM-550 PASS FAIL
108 36
108 162
108.1 36.0325
108.1 162.15
112 *
Image:
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FREQUENCIES RESULTS
VOR/ILS #2 TFM-550 PASS FAIL
108 36
108 162
108.1 36.0325
108.1 162.15
112 *
Image:
NOTES:
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D. The following procedure checks for second harmonic interference to the glide slope receiver from
the TFM-550. All transceivers produce harmonics (multiples of the wanted frequency) and while
the TFM-550 far exceeds FCC requirements, interference can still be experienced depending
upon antenna position and separation. Furthermore, harmonics can be generated by other
equipment in the aircraft and the structure of the aircraft where dissimilar metals make contact or
where grounds are isolated, etc. This is also true of aircraft hangers, therefore testing should be
done outside away from any structures where possible.
With a portable glide slope generator, provide enough signal to firmly activate the indicator needle
and hide all flags. Increase the signal level by 3 dB. Modulate the TFM-550 transmitter on the
following frequencies for at least 20 seconds. Observe the Glide Slope displays. Look for any
movement of flags or needles on the navigation display. If an interference condition is detected,
then the installation will have to be flight tested according to the following procedure. Using the
table below, determine the glide slope frequency based on the localizer frequency of the ILS to be
used. Divide the glide slope frequency by 2 and program into the TFM-550. Fly the aircraft to
intercept the localizer and glide slope (both needles centered) at 26 nm from the runway.
Transmit on the TFM-550 for 10 seconds and watch for any deflections or flags. Repeat the test
every 2 nm until the indicators are not affected. If the distance is greater than 18 nm then a pass
shall be recorded. Otherwise the TFM-550 shall be placarded “Do not transmit while on ILS
approach”.
Localizer Glide slope Localizer Glide slope
108.10 334.70 110.10 334.40
108.15 334.55 110.15 334.25
108.30 334.10 110.30 335.00
108.35 333.95 110.35 334.85
108.50 329.90 110.50 329.60
108.55 329.75 110.55 329.45
108.70 330.50 110.70 330.20
108.75 330.35 110.75 330.05
108.90 329.30 110.90 330.80
108.95 329.15 110.95 330.65
109.10 331.40 111.10 331.70
109.15 331.25 111.15 331.55
109.30 332.00 111.30 332.30
109.35 331.85 111.35 332.15
109.50 332.60 111.50 332.90
109.55 332.35 111.55 332.75
109.70 333.20 111.70 333.50
109.75 333.05 111.75 333.35
109.90 333.80 111.90 331.10
109.95 333.65 111.95 330.95
FREQUENCIES RESULTS
VOR/ILS #1 TFM-550 PASS FAIL
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
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334.7 (108.1) 33.47
334.7 (108.1) 167.35
FREQUENCIES RESULTS
VOR/ILS #2 TFM-550 PASS FAIL
334.7 (108.1) 33.47
334.7 (108.1) 167.35
NOTES:
E. Operate the TFM-550 transmitter on the following frequency for at least 20 seconds. Observe the
Transponder for any spurious replies or loss of reply to test set.
FREQUENCIES TRANSPONDER #1 TRANSPONDER #2
TFM-550 PASS FAIL PASS FAIL
512 MHz
NOTES:
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F. Modulate the TFM-550 transmitter on the following frequencies for at least 20 seconds. Observe
the DME displays. Look for loss of distance information on the display.
FREQUENCIES RESULTS
DME 1 TFM-550 PASS FAIL
978 (108.0) 489
1020 (112.1) 510
FREQUENCIES RESULTS
DME2 TFM-550 PASS FAIL
978 (108.0) 489
1020 (112.1) 510
NOTES:
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G. * While turning the ATC-550 on and off as often as required, listen for any noise or detected audio
signals on the HF receiver audio.
FREQUENCIES RESULTS #1
HF #1 PASS FAIL
16 MHz
FREQUENCIES TRANSPONDER #1
HF #2 PASS FAIL
16 MHz
NOTES:
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 8
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NOTE: For the following tests, select a frequency at the top, middle and bottom of each band of
the TFM-550 transceiver.
30 to 50
MHz Band 138 to 174
MHz Band 403 to 512
MHz Band
Frequency #1
Frequency #2 489
Frequency #3 510
H. At a safe altitude engage the autopilot or stability augmentation system. Modulate the TFM-550
transmitter on the above frequencies for at least 20 seconds. Observe any effect on the autopilot
or stability augmentation system.
Observations:
I. Perform a coupled ILS approach to the aircraft's certified limits. Modulate the TFM-550
transmitter on the above frequencies for at least 20 seconds. Observe any effect on the autopilot.
Repeat for second flight director/autopilot if equipped.
Observations:
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J. List the power plant, fuel and other electric instruments in the chart provided and note any
anomalies that occur while transmitting or switching ATC-550 antenna tuner controller on and off.
Assess the results.
STEP SYSTEM PASS FAIL NOTES
1
Com 1&2 (High Band)
2 Transponder & Encoder
(Low Band and Mid Band)
3 ADF 1 & 2
4 VG
5 Glideslope 1&2 (High Band)
6 VOR/LOC 1&2 (High Band)
7 Compass
8 Directional Gyro
9 Fuel Pressure
10 Oil Temp
11 Amps
12 Bus Voltage
13 Fuel %
14 Ng
15 TOT
16 Torque %
17 Annunciators
18 Digital Clock
19 Oil Pressure
20 DME 1&2
(Low Band and Mid Band)
21 GPS
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NOTES:
Technisonic Industries Limited
240 Traders Blvd., Mississauga, ON Canada L4Z 1W7
Tel: (905) 890-2113 Fax: (905) 890-5338
IMPORTANT
WARRANTY
All communication equipment manufactured by Technisonic Industries Limited is
warranted to be free of defects in Material or Workmanship under normal use for a period
of one year from Date of Purchase by the end user.
Warranty will only apply to equipment installed by a factory approved and/or authorized
facility in accordance with Technisonic published installation instructions. Equipment
falling under the following is not covered by warranty:
equipment that has been repaired or altered in any way as to affect performance,
equipment that has been subject to improper installation,
equipment that has been used for purposes other than intended,
equipment that has been involved in any accident, fire, flood, immersion or subject to
any other abuse.
Expressly excluded from this warranty are changes or charges relating to the removal and
re-installation of equipment from the aircraft. Technisonic will repair or replace (at
Technisonic's discretion) any defective transceiver (or part thereof) found to be faulty
during the Warranty Period.
Faulty equipment must be returned to Technisonic (or its authorized Warranty Depot) with
transportation charges prepaid. Repaired (or replacement) equipment will be returned to
the customer with collect freight charges. If the failure of a transceiver occurs within the
first 30 days of service, Technisonic will return the repaired or replacement equipment
prepaid.
Technisonic reserves the right to make changes in design, or additions to, or
improvements in its products without obligation to install such additions and
improvements in equipment previously manufactured. This Warranty is in lieu of any and
all other warranties express or implied, including any warranty of merchantability or
fitness, and of all other obligations or liabilities on the part of Technisonic.
This Warranty shall not be transferable or assignable to any other persons, firms or
corporations.
For warranty registration please complete the on-line
Warranty Registration Form found at www.til.ca.