3840 East Robinson Road, Suite 214, Amherst, New York 14228 Tel:(716)691-0669
CAUTION
This unit contains static sensitive devices. Wear a grounded wrist strap and/or conductive gloves
when handling printed circuit boards.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions : (1) this device may not cause harmful interference and (2) this device must accept any
interference received, including interference that may cause undesired operation.
NOTE: This equipment has been tested and found to comply with the limits fora Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses, and can
radiate radio frequency energy and, if not installed and used in accordance with the instruction
manual, may cause harmful interference to radio communications. However, there is no guarantee
that interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment of f
and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
SReorient or relocate the receiving antenna
SIncrease the separation between the equipment and receiver
SConnect the equipment into an outlet or circuit different from that to which the receiver is
connected.
SConsult the dealer or an experienced radio/TV technician for help.
WARRANTY INFORMATION
The Model TDFM-136, VHF/FM Digital Transceiver is under warranty for one year from date of
purchase. Failed units caused by defective parts, or workmanship should be returned to:
Technisonic Industries LimitedTechnisonic Industries Limited
250 Watline Avenue3840 E. Robinson Road, Suite 214
Mississauga,Amherst,
Ontario L4Z 1P4New York 14228
Summary of DO-160C Environmental Testing for Technisonic Model TDFM-136, VHF Digital
Transceiver
ConditionsSectionDescription of Conducted Tests
Temperature and Altitude4.0Equipment tested to categories B2 and
D1.
Vibration8.0Equipment is tested without shock
mounts to categories B, M and N.
Magnetic Effect15.0Equipment is class Z.
Power Input16.0Equipment tested to category B.
Voltage Spike17.0Equipment tested to category B.
RF Emission21.0Equipment tested to category Z.
1.1 INTRODUCTION
This publication provides operating and installation information on the TDFM-136, Digital
Transceiver manufactured by Technisonic Industries Limited. The TDFM-136 is Project 25
(P25), Phase 1 compliant. The unit offers digital or conventional analog FM communications
over 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 136-150 MHz portion of the band. If the TDFM-136 transceiver is used
in CANADA, operation is restricted to the following sub bands: 138-144, 148-148.99,
149.005-150.005 and 150.05-174 MHz. Furthermore the frequency agile transceiver is
restricted to airborne use must not be operated as a base station in Canada.
1.2DESCRIPTION
The TDFM-136, Transceiver is a frequency agile, fully synthesized airborne transceiver
capable of operating in the 136.000 MHz to 174.000 MHz frequency range in 2.5 kHz
increment s with either 25 kHz analog, 12.5 kHz analog channel spacing and P25, 12.5 kHz
digital modulation on a channel by channel basis. The Transceiver can operate without
restriction on any split frequency pair in the band and also incorporates a two channel
synthesized guard receiver.
B page
SECTION 1
GENERAL DESCRIPTION
The TDFM-136 Transceiver provides 150 operator accessible memory positions, 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 in the TDFM-136, wideband (25 kHz analog) or narrowband (12.5 kHz analog)
channel spacing assignment. The P25 mode (12.5 kHz digital) channels include both NAC and
Talk Group capability.
Operating frequency and other related data are presented on a 48 character, two line LED
matrix display. Data entry and function control are performed via a 12 button keypad. Preset
channels may also be scrolled and scanned through keypad function activation.
1.3PURPOSE OF EQUIPMENT
The TDFM-136, Digital VHF/FM Transceiver is designed to provide secondary airborne
communications to facilitate operations which are typically performed in a low altitude
environment. The transmitter section of this unit has a minimum of 8 watts and does 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.
1.4MODEL VARIATION
There are four variations of the Model TDFM-136 Transceiver. All units offer identical features
and performance except for the following differences:
TDFM-136, P/N 981087-1GREEN display and 28 Volt back lighting.
TDFM-136, P/N 981087-1 (5V)GREEN display and 5 Volt back lighting.
TDFM-136, P/N 981087-2RED display and 28 Volt back ligting.
1-1
TDFM-136, P/N 981087-2 (5V)RED display and 5 Volt back lighting.
Both P/N's 981087-1 and 981087-2 are always provided with 28 Volt back lighting unless a
specific request is made for 5 Volt AC operation.
1.5TECHNICAL CHARACTERISTICS
SpecificationCharacteristic
GENERAL
Model Designation:TDFM-136
Frequency Range:136.000 to 174.000 MHz
Operating Modes:P25 CAI and conventional analog
Channel Spacing:25 or 12.5 kHz
Physical Dimensions (including heatsink):Approx. 8.0" X 3.0" X 5.75"
Weight:Approx. 3.5 Lbs (1.6 Kg)
12.5/25 kHz conventional analog
12 KBPS FSK, 9.6 KBPS C4FM
Mounting:Panel Mount via Dzus fastners
Operating Temperature Range:-45EC to +70EC
Power Requirement:
Voltage:28.0 Vdc, ± 15%
Current:Receive - 0.7 A Max.
1 Watt Transmit - 1.3 A Max.
8-10 Watt Transmit - 2.0 A Max.
Frequency Selection:150 memories programmed with:
a) Tx Frequency/Rx Frequency
b) Tx/Rx CTCSS tone or DPL code
c) 9 character alpha numeric title
Guard Receiver:2 channels programmed with:
a) Tx Frequency/Rx Frequency
b) Tx CTCSS tone or DPL code
c) 9 character alpha numeric title
CTCSS squelch/encoder:All CTCSS tones available
DPL digital squelch/encoder:All standard DPL codes
DTMF encoder:All standard DTMF tones
Audio Output:0.5 Watts into 600 ohms
Speaker Output:2.5 Watts min. into 4 ohms
Back Lighting:28 Volts (standard) or
5 Volts (specify)
1-2
Display Colour:Green (standard) or
DPL is a trademark of Motorola Corporation
1.5TECHNICAL CHARACTERISTICS (continued)
MAIN RECEIVER
Sensitivity at 12 dB SINAD-116dBm
Adjacent Channel Selectivity-60dB (25 or 12.5 KHz)
Spurious Attenuation-70 dB
Third Order Intermodulation-70 dB
Image Attenuation-80 dB
FM Acceptance± 6 KHz
Red (specify)
NVG Optional
Hum and NoiseBetter than 45dB
Audio Distortionless than 5%
Antenna Conducted Emissionless than -57dBm
GUARD RECEIVER
All specifications identical to main receiver.
TRANSMITTER
RF Power OutputLo -100mW to 1W (internal adjustment)
or hi-power; 10 watts.
Output Impedance50 ohms
Maximum Deviation±5 KHz (25 KHz mode)
(In narrowband mode)±2.5 KHz (12.5KHz mode)
Spurious Attenuation-90 dB below carrier level
Frequency Stability± 2.5 ppm
Microphone CircuitCarbon or equivalent
Sidetone Output0.5W (max) into 600S
Harmonic Attenuation-65 dB below carrier level
FM Hum And Noise-40 dB
1-3
Audio Input50 mV at 2.5 KHz into
200 S input circuit for
±3.5KHz deviation, adjst.
Audio DistortionLess than 5%
SECTION 2
OPERATING INSTRUCTIONS
2.1OPERATING FEATURES
The Technisonic TDFM-136 airborne FM transceiver is visually similar to the industry standard TFM138, a two line by 24 character display is centered at the top of the unit, just below the display are
six user controls on the left and a 12 key keypad on the right (refer to Figure 2-1). The TDFM-136
support the following features:
1.150 memory positions which can each be programmed with a transmit and receive
frequency with 25 or 12.5 kHz analog channel spacing, Tx/Rx CTCSS tones or DP L
codes and a 9-character alphanumeric title. Or the memory positions can be
programmed to P25 Digital mode (12.5 kHz) with or without a P25 Talkgroup.
2.2 guard channels which can each be programmed with a Rx frequency with 25 or 12.5
kHz channel spacing, CTCSS Tx tone or DPL code and a 9-character alphanumeric title.
Or either guard channel can be programmed to P25 Digital mode (12.5 kHz) with or
without a P25 Talkgroup.
3.Scanning of programmed memories with selective memory scanning, in 5 scan lists.
4.Priority scan of memory channel 1, if desired.
5.Direct frequency entry mode.
6.Receive frequency simplex function.
7.Switchable RF output power between 1 watt and 8-10 watts.
8.Lockout of keyboard to prevent inadvertent entries.
9.Variable frequency mode to manually scan up and down in 2.5 kHz steps.
10.LED display variable dimming mode.
11.Selectable 90 second Tx time out feature.
12.Quick download of any of the 150 memory positions to the guard memories.
13.PC Memory Upload or download capability.
2.2OPERATOR CONTROLS
The user controls comprise a main volume control – with integrated on/off switch - a guard volume control,
a squelch defeat button, a MAIN/GD selection switch, a GD1/GD2 selection switch, and a high/low power
switch. The keypad layout is a 3 by 4 matrix, the layout being similar to a telephone keypad, though the
options are arranged differently.
2-1
2-2
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