MODEL TFM-30
Airborne VHF FM Transceiver
Technisonic VHF FM Airborne Transceiver
The Technisonic TFM-30 airborne VHF/FM transceiver utilizes state of the art frequency synthesis
techniques to provide FM communications on every currently available channel in the Public Safety,
Forestry and General Service VHF/FM Low Band. This transceiver provides coverage from 30.000 MHz to
50.000 MHz in 2.5 KHz increments and is capable of operation in both 12.5 KHz (Narrow Band) and 25 KHz
(wide Band) mode. Data entry and function control are via a front panel 12 button keypad. Operating
frequency and other related data are presented on a 48 character two line LED matrix display which is
available in either green or red (green standard, red optional).
Technisonic FM transceivers can be operated in the Direct Entry or Simplex mode by simply keying in the
desired operating frequency, or can function without restriction on any split frequency pair within the band.
The TFM-30 features 120 preset memory positions each of which is capable of storing a receive frequency,
a transmit frequency, a separate CTCSS tone and/or DPL / DCS (Digitally coded Squelch) code for each
receive and transmit frequency and an alpha numeric identifier for each channel. The TFM-30 allows either
25 kHz wide band or 12.5 kHz narrow band operation on any or all of 120 preset channels. Data can be
easily entered into any of the preset non-volatile memory positions for both main and guard channels via
the front panel keyboard, or can be downloaded form a PC or uploaded to a PC from a transceiver using
software supplied with each radio. Information stored in memory is available for instant recall by keypad
entry, or by pressing the UP or DOWN button which allows the operator to scroll through all preset
channels. Technisonic FM transceivers feature a synthesized two channel guard, receiver, a DTMF
encoder for signaling during transmit, and a scan function which will scan any or all of the frequencies
stored in the preset memory positions.
The TFM-30 transceiver is panel mounted (Dzus) and completely self contained in a 8.0 x 3.0 x 5.75 inch
chassis weighing just 3.1 pounds. Front panel controls are
MAIN
for main channel volume;
GUARD
for
guard channel volume;
MON
for squelch test; a
MN/GD
switch provides for main or guard transmitter
selection; a
G1/G2
switch selects guard 1 or guard 2 receive and transmit; and a
HI/LO
switch allows for
control of transmitter power output. Hi power is 10 Watts output, low power is 1 Watt output, to comply with
Marine harbor environment rules. This transceiver offers 28 volt DC backlighting, which is controlled by the
aircraft dimmer bus. Display brightness is controlled from the front panel keypad. The small size and light
weight of the TFM-30 transceiver makes this radio ideally suited to helicopter installations Technisonic FM
transceivers 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 Section 21, Category Z.
