TECHNISONIC INDUSTRIES LIMITED
www.til.ca
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.
Summary of Contents for TFM-550
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