TA2922 Universal Line Interface Service Manual 35
© Tait Electronics Limited March 2010
AC coupled line to unconnected I/O pad, J1. J1 can be manually hard-wired to
another signal on the TA2922 interface board or within the radio itself for external
access to signals which are not normally available.
For example, a piece of 0.22mm
2
hookup wire 110mm in length can be used to
connect to one half of the radio’s speaker power amplifier by soldering internally
to the radio power/speaker connector. This would enable speaker level audio to
drive audio loads of greater then 50 ohms for volume controlled speaker level audio
when the ‘RX_AUD’ line is not volume controlled in the case of the radio being
used with a remote head or multi-head configuration.
If desired, resistor R79 can be fitted in place of AC coupling capacitor C56 if DC
level signals are required.
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