MODEL TFM-500
Airborne VHF/ UHF FM Transceiver
Technisonic VHF/UHF FM Airborne Transceiver
The Technisonic TFM-500 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 High
Band and UHF/FM Band. The VHF module covers from 138 to 174 MHz in 2.5 KHz increments while the UHF
module covers 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-500
can be installed as a single transceiver operating in VHF or UHF mode through a single audio controller FM input, or
can be installed as FM1 and FM2 enabling simultaneous operation on both bands. Additionally, this transceiver can
operate as a 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
conveniently situated on the face panel.
The TFM-500 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 either band. This unit features
400 preset memory positions (200 VHF 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-500 provides for either 25 kHz wide
band or 12.5 kHz narrow band operation on any or all of it’s 400 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 UP or DOWN buttons which allows an operator to scroll through all preset
channels. The TFM-500 transceiver features a synthesized two channel VHF or UHF guard receiver, 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. A remote control head is offered (RC-500) 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. Both
UHF and VHF operating frequency as well as Guard selection and operating frequency can be controlled from the
“remote” position. Active frequency is displayed on both remote and local displays.
The TFM-500 transceiver is panel mounted (Dzus) and completely self contained in a 8.0 x 3.75 x 5.75 inch chassis
weighing just 4.7 pounds. Front panel controls are
UHF
for UHF main channel volume;
VHF
for VHF main channel
volume,
GUARD
for guard channel volume; a
UHF/VHF
Band transmit select switch, a
MN/GD
switch for main or
guard transmitter selection; a
G1/G2
switch for guard 1 or guard 2 receive and transmit select; and a
HI/LO
switch
for control of transmitter power output. Hi power is 10 Watts output, low power is 1 Watt output. This transceiver
offers 28 volt DC backlighting as standard, (5 Volt AC as an option) which is controlled by the aircraft dimmer bus.
Display brightness is controlled from the front panel keypad. The “remote control” function is via a separate 9 pin
Cannon D submin connector located on the rear panel of the TFM-500 transceiver. External access for mic gain and
sidetone level adjust provide for easy installation and setup for optimum performance. The small size and light
weight (4.7 lbs., 2.2 Kg) of the TFM-500 Dual 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).
