Technisonic Industries Limited TFM-550 User manual

MODEL TFM-550
Airborne UHF and VHF High/Low band FM Transceiver
Technisonic Multi-Band VHF Lo/VHF Hi and UHF AirborneTransceiver
The Technisonic TFM-550 Multi-Band airborne VHF/UHF FM transceiver utilizes state of the art frequency synthesis techniques to
provide FM communications on every currently available channel within the General Radio Service VHF/FM Low Band, VHF/FM
High Band and UHF/FM Band. This transceiver covers VHF Low Band from 30 to 50 MHz in 2.5 KHz steps, VHF High Band from
138 to 174 MHz in 2.5 KHz increments and UHF from 403 to 512 MHz also in 2.5 KHz steps. Operating frequencies and other
related data are presented on a 96 character, four line LED matrix display, which is available in either red or green.
The TFM-550 can be installed to operate in “Single Mode” to function as a multi-band transceiver operating in VHF Lo, VHF Hi or
UHF bands with combined audio run through a single audio controller FM input. In this mode, the band select switch is positioned
by the operator to select one of the three bands which are accessed one at a time. Combined audio and transmit control are
available at J101 (15 pin connector) at the rear of the transceiver. Alternately, the TFM-550 can function in “Dual Mode” and be
installed to two FM positions (typically FM1 and FM2) on the audio controller, allowing for simultaneous operation on UHF and
either VHF Low or VHF High Band. In this mode, VHF Hi and VHF Lo audio are combined and output to a single audio controller
FM input. The front panel band select switch provides for VHF-Hi or VHF Lo transmitter selection. VHF Hi and VHF Lo audio and
transmit control functions are available at J102 (9 pin connector) at the rear of the transceiver. UHF receive and transmit
functions are totally independent and controlled via the second audio controller position allowing for simultaneous VHF (Hi or Lo)
and UHF operation. Additionally, the TFM-550 can operate as a VHF/UHF cross band repeater. The cross band function is front
panel controlled and requires only 2 key stokes to enable or disable. All data entry and control commands are entered via an
enhanced 12 button keypad situated on the face panel.
The TFM-550 can be operated in the Direct Entry or Simplex mode by simply keying in the desired operating frequency. It can
also function without restriction on any split frequency pair within any of it’s three bands. This unit features 600 preset memory
positions (200 VHF Lo, 200 VHF Hi and 200 UHF) each capable of storing a receive frequency, a transmit frequency, a separate
CTCSS tone for each receive and transmit frequency, an alpha numeric identifier for each channel and a DPL or DCS coded
squelch identifier for each channel. The TFM-550 provides for either 25 kHz wide band or 12.5 kHz narrow band operation on any
or all of it’s 600 preset channels. An upload/download function allows the operator to download channel information from a PC, or
upload stored data from the transceiver to a PC. Supporting software is supplied with each unit. Information stored in the
transceiver’s memory is available for instant recall by keypad entry or, by pressing the M.UP or M.DOWN button which allows the
operator to scroll through all preset channels. The TFM-550 transceiver also features a DTMF encoder for signaling during
transmit, and a scan function which will scan any or all of the frequencies stored in up to five scan lists. Additionally, a remote
control head is offered (RC-550) which provides for slaved operation of the main transceiver from a remote location, allowing for a
second position in the aircraft to exercise frequency control. VHF Low band, VHF High Band and UHF operating frequencies as
well as the Direct/Repeat function can be controlled from the “remote” position. Active frequency for all three bands is displayed
on both remote and local displays.
The TFM-550 transceiver is panel mounted (Dzus) and completely self contained in a 8.0 x 3.75 x 5.75 inch chassis weighing just
5.0 pounds. Front panel controls are UHF for UHF audio level; VHF for VHF High Band audio level and VHFLO for VHF Low
Band audio level. The VHF/UHF/VLO band switch enables selection of the desired band as well as providing for manual
programming, a VHF/PRI select switch provides for a VHF priority channel, and a HI/LO switch controls transmitter power output.
Twenty eight (28) volt DC backlighting is standard, (5 Volt AC is optional) and controlled by the aircraft dimmer bus. Display
brightness is controlled from the front panel keypad. RC-550 “remote control” access is via a 9 pin connector (J102) located on
the rear panel of the TFM-550 transceiver. External access for mic level adjust (sidetone is software controlled and operator
adjustable) provides for easy installation and setup for optimum performance. The small size and light weight (5.0 lbs., 2.3 Kg) of
the TFM-550 Multi- Band transceiver makes this radio ideally suited to helicopter installations. Technisonic FM radios are
compliant with RTCA DO-160C categories relating to Vibration, Overpressure, Humidity, Temperature and Altitude, Magnetic
Effect, Power Input, Voltage Spike, Decompression, and RF Emission (including DO-160C, Section 21, Category Z).

TFM-550 General Specifications
General
Active frequency coverage 30.000 to 50.00 MHz, 138.000 to 174.000 MHz and 403.000 to 512.000 MHz
Tuning increments 2.5 KHz, all three bands
Operating mode F3E Simplex or Semi-Duplex
Memory positions 600 Channels total (200 each band)
Dimensions Approx. 8.0 in.D. x 3.75 in H. x 5.75 in W.
Weight 5.1 Lbs, 2.3 Kg.
Temperature range -45 deg C to +70 deg C
Altitude 50,000 feet
Power requirement 28 VDC
850 mA receive
3.4 Amps, two transmitters, 10 Watts
1.8 Amps, two transmitters, 1.0 Watt
1.4 Amps, 1 transmitter, 1 Watt
2.2 Amps, 1 transmitter, 10 Watts
Certification FCC and DOC Type approved
RTCA DO-160C Env. Categories (B2,D1)XXX(B,M,N)XXXXXXABBXXXZXXX
CTCSS squelch capability Encodes/decodes all 64 available tones
DPL/DCS capability Encodes/decodes all available digital squelch codes
DTMF encoder All standard DTMF tones supported
Audio output 500 mW into 600 ohms
Audio distortion Less than 5%
Speaker output 2.5 Watts into 4 ohms
Back lighting 28 VDC (standard) or 5 Volts (specify)
Display (Green (standard), red optional (specify)
Transmitters
Transmit RF power output 1 Watt or 10 Watts, front panel selectable, all bands
Maximum deviation Limited to 2.5 KHz for 12.5 KHz channels and 5 KHz for 25 KHz and 30 KHz channels
Spurious attenuation -90 dB below carrier level
Frequency stability + 0.00025%
Microphone circuit Carbon or equivalent
Sidetone output 500 mW (max) into 600 Ohms
Harmonic attenuation -65 dB below carrier level
FM hum and noise -40 dB
Audio input 50 mV at 2.5 KHz into a 200 Ohm circuit for + 3.5 KHz (25 KHz mode), adjustable
50 mV at 2.5 KHz into a 200 Ohm circuit for + 2.0 KHz (12.5 KHz mode), adjustable
Audio distortion Less than 5%
Transmitter output impedance 50 Ohms
Maximum deviation Limited to 2.5 KHz for 12.5 KHz channels and 5.0 KHz for 25 KHz channels
Receivers VHF Low Band VHF High Band UHF Band
Frequency Range 30.000 MHz to 50.000 Mhz 138.000 MHz to 174.000 MHz 403.000 MHz to 512.000 Mhz
Tuning increments 2.5 KHz 2.5 KHz 2.5 KHz
Operating Mode F3E simplex or semi-duplex F3E simplex or semi-duplex F3E simplex or semi-duplex
Channel spacing 12.5 KHz or 25 KHz 12.5 KHz, 25 KHz or 30 KHz 12.5 KHz, 20 KHz or 25 KHz
As per applicable FCC and IC Type Approvals
Memory positions 200 channels 200 channels 200 channels
Sensitivity at 12 dB SINAD Better than 0.35 microvolts Better than 0.35 microvolts Better than 0.35 microvolts
Adjacent channel -70 dB (25 KHz) -78 dB for 25 KHZ, -70 dB for 12.5 KHz -70 dB for 25 KHz, -70 dB for 12.5 KHz
Spurious attenuation -80 dB -90 dB -90 dB
Third order intermod -70 dB 70 dB -70 dB
Image attenuation -80 dB -80 dB -70 dB
FM acceptance + 6KHZ + 6 Khz + 6 Khz
Hum and noise Better than 40 dB Better than 50 dB Better than 40 dB
Audio distortion Less than 5% Less than 5% Less than 5%
Ant conducted emission Less than –80 dBm Less than -70 dBm Less than -70 dBm
Note: Specificationsaresubjectto changewithoutnotice
DPLis atrademark ofMotorolaCorporation
TFM-550, Rev:1
Technisonic Industries Ltd.
240 Traders Blvd, Mississauga, Ontario L4Z 1W7 Canada
Ph: 905 890-2113 Fax: [phone] www.til.ca

1
TFM-550
VHF High/VHF Low/UHF
MULTIBAND FM AIRBORNE TRANSCEIVER
Installation and
Operating Instructions
TiL Document No. 99RE262
Rev. A Issue 10
AUGUST 2010
Technisonic Industries Limited
240 Traders Boulevard, Mississauga, Ontario L4Z 1W7
Tel: [phone] Fax: [phone]
www.til.ca
Copyright by Technisonic Industries Limited. All rights reserved.

2
IMPORTANT
INFORMATION
As of January 1st, 2013, the FCC will no longer allow transceivers to be delivered to the
USA that are capable of wide band (25kHz) channel spacing in the commercial 2 way
mobile / base sections of the VHF and UHF bands. TDFM-550 transceivers delivered to
the USA after this date will no longer support wide band operation on those bands. VHF
low band is not affected. Channels programmed by MultiTDP software on VHF and UHF
to wide band will automatically change to narrow band when loaded into the TFM-550.

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
-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, +60ºC to +70ºC)
AUG 2010
SM
Issue 9 1-1 Para. 1.4 added NV P/Ns FEB 2012 FM
Issue 10 Added FCC 1 Jan 2013 notice. JAN 2013 SM

ii

TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 9
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 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: [phone]
Fax: [phone]

TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 9
iv
Summary of DO-160C Environmental Testing
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 9
vi
APPENDIX
Post Install EMI Tests ......................................................................................... A-1
WARRANTY ................................................................................................................
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 9
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. 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 plus 2 with NV. All units offer
identical features and performance except for the following differences:
TFM-550, P/N 991095-1 (28V) GREEN display and 28 Volt back lighting.
TFM-550, P/N 991095-1 (5V) GREEN display and 5 Volt back lighting.
TFM-550, P/N 991095-1 (28V) NV GREEN display and 28 Volt back lighting.
TFM-550, P/N 991095-1 (5V) NV GREEN display and 5 Volt back lighting.
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.

TECHNISONIC INDUSTRIES LIMITED
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 9
1-2
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:
DPL1digital 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 Ω
2.5 Watts min. into 4 Ω
28 Volts (standard) or 5 Volts (specify)
Green (standard) or Red (specify)
1 DPL is a trademark of Motorola Corporation

TECHNISONIC INDUSTRIES LIMITED
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 9
1-3
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

TECHNISONIC INDUSTRIES LIMITED
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 9
1-4
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 Ω
±5 kHz (25 kHz mode)
±2.5 kHz (12.5 kHz mode)
-90 dB below carrier level
±2.5 ppm (-30ºC to +55ºC)
±2.6 ppm (-45ºC, +60º to +70ºC)
Carbon or equivalent
0.5W (max) into 600 Ω
-60 dB below carrier level
-40 dB
50 mV at 2.5 kHz into
200 Ωinput circuit for
±3.5kHz deviation, adjust.
Less than 5%

TECHNISONIC INDUSTRIES LIMITED
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TFM-550 Installation & Operating Instructions TiL 99RE262 Rev A Issue 9
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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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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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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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 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.