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 27© Tait Electronics Limited March 2010SK1 I/O signal descriptionsA LINE OUT 1■ Signal direction: output■ Signal level: -30 to +10dBm■ Signal impedance: 600 ohmsHalf of the isolated balanced audio output line, paired with LINE OUT 2. Audiois from radio receiver which is optionally summed with line in audio when theoptional side tone adjustment pot RV3 is fitted. The radio RX audio to line outputlevel is adjusted by VR1. The radio signal source is fixed in level withAUD_TAP_OUT is selected or is varied with the radio volume control if theRX_AUD source is selected as an option in the TA2922 programmable options.Note that in some radio configurations the RX_AUD level becomes fixed and isnot volume controlled, such as when some remote head or multi-head options arein use. The frequency response of audio sourced from AUD_TAP_OUT is definedin the programmable audio options of the radio, while audio sourced fromRX_AUD is de-emphasised. Depending on link population, the line output paircan be used for 2-wire audio in and out and for centre tap ‘phantom’ DC keyingoptions. See “Additional configuration links” on page 38. Frequency response isfrom 50Hz to 3kHz.L RSSI Analogue RSSI output from the radio Output 0-3VDCM LINE IN UNBAL Unbalanced transmitter audio input Input 8mV to 1V RMSN LINE OUT UNBAL Unbalanced receiver audio output Output 25mV to 1V RMSO GATE OUT DIRECT Open collector RX gate output Output 45VDC maxP PTT DIRECT Un-isolated PTT input Input 5VDC maxQ EXT GPIO3 Bidirectional I/O to/from radio Bidirectional 0-3.3VDCR EXT GPIO4 Bidirectional I/O to/from radio and lineinterface disableBidirectional 0-3.3VDCS EXT GPIO5 Bidirectional I/O to/from radio Bidirectional 0-3.3VDCT EXT GPIO6 Bidirectional I/O to/from radio Bidirectional 0-3.3VDCU EXT GPIO7 Bidirectional I/O to/from radio Bidirectional 0-3.3VDCV RADIO DATA IN Data to microcontroller (RS-232 level) Input -10 to +10VW RADIO DATA OUT Data from microcontroller (RS-232 level) Output -10 to +10VX RTS IN RTS input to microcontroller (RS-232level) [not yet implemented]Input -10 to +10VY CTS OUT CTS output from microcontroller (RS-232level) [not yet implemented]Output -10 to +10VZ AUX I/O AC coupled line to J1, can connect toradio speaker output via internal wireBidirectional N/ASignalNumber Signal Name DescriptionDirection(relative toTA2922)Level |
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