TA2922 Universal Line Interface Service Manual 7
© Tait Electronics Limited March 2010
1 Introduction
The TA2922 TM8/TM9 universal line interface board is fitted
into the TM8000 and TM9000 radios, and is functionally
equivalent to the AM8000-UIS manufactured by Tait
Australia. It features hardware and software-configurable
options for:
■ 8-wire line interface
■ 2-wire line interface with phantom DC keying options,
■ 4-wire line interface with phantom DC keying options, and
■ 6-wire E&M interface.
The field programmable microcontroller allows linking/
repeating options to be configured by software, including tail
and anti-kerchunker timers and a flexible supply voltage
monitoring alarm.
A configuratble matrix allows the integrator to allocate any of
26 different I/O signals to any of the nine pins on the external
9-way D-range socket.
The interface board fits inside the radio in the options cavity
and is connected to the main PCB by the internal options
loom. The 9-way D-range connector mounted on the
interface board fits through the external options connector
hole provided in the radio chassis.
1.1 Operation
The TA2922 universal line interface board provides an interface between balanced
600 ohm lines and the TM8000 and TM9000 series radios.
Unbalanced audio allows direct interfacing to equipment using unbalanced audio
(audio referenced to ground) where the input and output levels need to be
adjustable.
Using an appropriate cable, two TA2922 interfaces can be installed into two
TM8000 and/or TM9000 radios for linking purposes. This includes linking of
repeaters (same RF band or mixed RF band) and mobile linking applications, for
example an in-vehicle repeater that communicates between a wide area VHF radio
network and a UHF portable radio.
Important The radio does not meet the IP54
protection standard once an
interface board has been installed
unless the external options cover
seal is installed.
external options
connector
internal options
connector
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