User's Manual

1-1
SECTION 1
GENERAL DESCRIPTION
1.1 INTRODUCTION
This publication provides operating and installation information on the TFM-500 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 band. If the TFM-500 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.
1.2 DESCRIPTION
The TFM-500, Transceiver is a frequency agile, fully synthesized airborne transceiver
capable of operating in the 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 and also incorporates a two
channel VHF synthesized guard receiver.
The TFM-500 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 through keypad function activation. Data
may also be entered via a Windows 95/98/NT/2000/ME based computer with the provided
software and optional PC Up/download cable, P/N 993390-1.
1.3 PURPOSE OF EQUIPMENT
The TFM-500, VHF/UHF 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-500 Transceiver. All units offer identical features
and performance except for the following differences:
TFM-500, P/N 971083-1 GREEN display and 28 Volt back lighting.
TFM-500, P/N 971083-1 (5V), GREEN display and 5 Volt back lighting.
TFM-500, P/N 971083-3 RED display and 28 Volt back ligting.
TFM-500, P/N 971083-3 (5V), RED display and 5 Volt back lighting.
Both P/N's 971083-1 and 971083-3 are always provided with 28 Volt back lighting unless a
specific request is made for 5 Volt AC operation.