User's Manual

SECT IO N 1
GENE RAL DESCRIPT IO N
1.1 Introduction
This publication provides operating and installation information for the TDFM-136B, Digital
Transceiver manufactured by Technisonic Industries Limited. The TDFM-136B 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-
136B 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-136B, 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-136B Transceiver provides 230 operator accessible memory positions. Each of
which is capable of storing Scan List membership information, up to eight (8) 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-136B, 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.
Technisonic Industries Ltd. 1-1