Technisonic Industries Ltd.
1-1
SE CTION 1
GENERAL DESCRIPTION
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 and must not be operated as a base station in Canada.
1.2 Description
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 2.5kHz increments 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.
The TDFM-136 Transceiver provides 200 operator accessible memory positions. Each of which
is capable of storing Scan List membership information, up to nine (9) character alphanumeric
identifier, and Operating Mode information. In addition each memory position contains
information for both transmit and receive including: frequency, CTCSS tone, DCS (DPL) code,
P25 TalkGroup, and P25 Network Access Code (NAC) information.
Channel operating parameters, including frequency and other related data, are presented on
a 48 character, two line LED matrix display. Data entry and function control takes place via a
12 button keypad.
1.3 Purpose 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.
