Tait TM8200 Accessories Manual
Also see for TM8200 mobiles: Service manualInstallation guideInstallation guideProtocol manualOperator's manual
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Contents
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TM8100/TM8200 Accessories Manual TMAA10-04 Remote PTT Kit and TMAA10-05 Hands-Free Kit 129© Tait Electronics Limited August 2005.17.6 Circuit DescriptionThe remote microphone signal is amplified by a pre-amplifier in theauxiliary connector plug. The power supply to this amplifier is provided bythe +13.8V supply on the auxiliary connector. This supply is filtered andregulated down to approximately 3.3V. The reference voltage for theregulator is provided by AUX_GPIO4 line.The remote microphone signal is fed via AUX_MIC_AUD and an inputselector to the radio’s internal microphone amplifier. The microphone inputselected depends on the PTT source used to make the call. If the remote PTTis used, then AUX_MIC_AUD is selected. If the control head microphonePTT is used, then CH_MIC_AUD is selected. Test points for all otherauxiliary connections are provided on the auxiliary connector plug PCB tofacilitate the connection of other devices or signals e.g ignition switch signal.Figure 17.1 TMAA10-04/TMAA10-05 to radio interface |
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