Tait TM8000 Series Accessories Manual

Also see for TM8000 Series: Service manual Service manual Installation instructions Operation and service manual Service manual

Contents

Tait TM8000 Series Accessories Manual Manual pdf 48 page image

48 TMAA02-02 DTMF Microphone TM8000 Mobile Radio Accessories ManualMarch 2004 © Tait Electronics Limited4.1.2 Installing the Microphone ClipInstall the microphone clip in the most convenient location for the radiouser. It must be within easy reach of the user, but in such a position that themicrophone PTT key cannot be inadvertently activated or jammed on.Connect the microphone clip to the negative supply if hookswitchoperation is required.4.2 AdjustmentRemove the DTMF microphone back cover and set the DTMF tone levelto approximately 80% deviation (±4kHz for wide bandwidth radios and±2kHz for narrow bandwidth radios).4.3 Radio ProgrammingThe following table shows the settings required for CH_GPIO1 in theProgrammable I/O form of the TM8000 Programming Application. Thissetting means that when a key is pressed on the microphone, the DTMFtones are fed into the radio’s speaker at a reduced volume, giving the radiouser confidence that the tones are being transmitted. Refer to the onlinehelp of the programming application for more information.4.4 Interface SpecificationThe following table and diagram summarizes the signals used for the DTMFmicrophone on the radio’s microphone connector and shows the interfacebetween the DTMF microphone and the radio.Table 4.1 DTMF microphone settings in the Programmable I/O form, Digital tabPin Direction Label Action Active Debounce Signal State Mirrored ToCH_GPIO1 Input None Send Mic AudioTo SpkrHigh None None NoneTable 4.2 DTMF microphone connector - pins and signalsPin Signal Colour Description1 — — not connected2 13V8_SW red power supply (switched)3 — yellow not connected4 MIC_PTT black PTT and hookswitch5 MIC_AUD white audio from the microphone6 AGND blue analogue ground7 — — not connected8 MIC_GPIO1 green mute out