Tait TM8000 Service Manual
Also see for TM9000: Installation instructions
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Contents
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TA2922 Universal Line Interface Service Manual 25© Tait Electronics Limited March 20104. Set the radio communications analyser to monitor the radios RFtransmission.5. Set the audio generator to produce a 1kHz audio tone at the desired level.6. Activate the TX key input to the TA2922 interface to set the radio totransmit.7. Monitor the transmitter deviation using the communications analyser andadjust RV2 on the TA2922 interface to achieve 60% system deviation(1.5kHz for narrow band, 3kHz for wide band).4.2 Talk-through level adjustmentThe talk-through or side-tone feature is enabled by fitting optional componentVR3 (Tait IPN 040-06000-00). This allows audio which enters the TA2922interface on the balanced or un-balanced line in path to be re-routed back out onthe balanced or un-balanced line out path.Situations where this would be used is to provide microphone-to-earpiece sidetone, or when a single input voice recorder system needs to record both transmitand receive sides of a two-way conversation.Important This feature cannot be used when the TA2922 is operating in 2-wire mode. Fitting VR3 when in 2-wire mode may cause audiooscillations or instability.1. Fit VR3 to the TA2922 interface by soldering in the three component leads.2. Align both the line in and line out audio levels as described in the previoussection.3. Disable the RF output of the communications analyser so that the radio isin an idle state (not transmitting and not receiving a RF signal).4. On the communications analyser, generate a 1kHz tone at the nominalaudio level, connect this to the TA2922 line input.5. Ensure there is a 600 ohm termination resistor fitted across the two balancedline out audio wires.6. While continuing to generate the 1kHz tone, monitor the TA2922 lineoutput on the communications analyser.7. Adjust VR3 on the TA2922 line interface to set the desired talk throughaudio level. |
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