Tait Orca series Service Manual

F - 4 Interfacing non-Tait accessories 11/98 IPN: 449-51000-01SENSE-0/SENSE-16(16(Ì˝DQG˝6(16(Ï˝OLQHV˝DUH˝XVHG˝WR˝GHWHFW˝DFFHVVRULHVÔ˝6(16(Ì˝LV˝XVHG˝WR˝WXUQ˝RII˝WKH˝UDGLR™V˝LQWHUQDO˝VSHDNHUÔ˝7R˝WXUQ˝RII˝WKH˝LQWHUQDO˝VSHDNHUÒ˝WLH˝6(16(Ì˝WR˝*1'˝E\˝VKRUWLQJ˝OLQN˝Ï˝ı/.ÏÙÔ˝7KH˝H[WHUQDO˝VSHDNHU˝RXWSXWV˝DUH˝DOZD\V˝DFWLYHÔ6(16(Ï˝LV˝XVHG˝WR˝SXW˝WKH˝UDGLR˝LQ˝92;˝PRGH˝ZKHQ˝DQ˝H[WHUQDO˝YRLFHRSHUDWHG˝VZLWFK˝LV˝XVHG˝WR˝FRQWURO˝(;7377˝ıHÔJÔ˝LQ˝D˝KDQGVIUHH˝YHKLFOH˝NLWÙÔ˝7R˝GR˝WKLVÒ˝WLH˝6(16(Ï˝WR˝*1'˝E\˝VKRUWLQJ˝OLQN˝Î˝ı/.ÎÙÔ˝,I˝WKH˝UDGLR˝LV˝EHLQJ˝XVHG˝LQ˝92;˝PRGH˝RQ˝D˝FRQYHQWLRQDO˝FKDQQHOÒ˝WKHQ˝(;7377˝ZLOO˝RQO\˝EH˝VHQVHG˝ZKHQ˝LW˝LV˝QRW˝EXV\Ô˝,I˝WKH˝UDGLR˝LV˝EHLQJ˝XVHG˝RQ˝D˝WUXQNLQJ˝QHWZRUNÒ˝WKHQ˝(;7377˝ZLOO˝RQO\˝EH˝VHQVHG˝ZKHQ˝LW˝LV˝RQ˝D˝YDOLG˝WUDIILF˝FKDQQHOÔ˝$˝WUXQNLQJ˝FDOO˝PXVW˝EH˝LQLWLDWHG˝E\˝DQ˝LQWHUQDO˝NH\˝RQ˝WKH˝UDGLRÔEXT-MIC7KH˝(;70,&˝VLJQDO˝LV˝DQ˝DQDORJXH˝LQSXW˝IURP˝WKH˝PLFURSKRQH˝RI˝DQ˝DFFHVVRU\Ô&RQQHFWLQJ˝D˝PLFURSKRQH˝WR˝(;70,&˝DXWRPDWLFDOO\˝WXUQV˝RII˝WKH˝UDGLR™V˝LQWHUQDO˝PLFURSKRQHÔEXT-PTT7KH˝(;7377˝LV˝DQ˝DQDORJXH˝VLJQDO˝IURP˝WKH˝DFFHVVRU\˝LQWHUIDFH˝WR˝WKH˝FRQWURO˝DUHD˝DQG˝LQGLFDWHV˝DQ˝H[WHUQDO˝UHTXHVW˝IRU˝377˝DQG˝H[WHUQDO˝IXQFWLRQ˝EXWWRQVÔTable F-1: Accessory connector signal descriptionsSignal Description Type Signal levelOutputimpedance/currentInputimpedanceRX-DET-AF Unmuted receive audio Analogue audio1.15-1.6 VDC53-225 mVrms 2.2 kΩ –MOD-AUDIO Modulator input Analogue audio 0-4.8 V pp 2.4 VDC – 470 Ω+7V5-ACC* Accessory power DC supply 7.0 V* nominal* Dependent on battery charge level.20 mA (max) –RXD Serial receive data CMOS high = 0low = 1– –TXD Serial transmit data CMOS high = 0low = 11 mA (max) –SENSE-0 Accessory sense(internal speaker disable)CMOS high = 1low = 01 mA (max) –SENSE-1 Accessory sense(VOX mode)CMOS high = 1low = 01 mA (max) –EXT-MIC External microphone input(electret)Analogue audio 11 mV pp (typical)DC coupled– 1 kΩEXT-PTT External push-to-talk input Analogue DC 0-5 V, PTT = 0 V – 27 kΩEXT-SPKR External speaker differential output Analogue audio ±6.5 V ppdifferentialTo drive 16 Ωdifferentially–EXT+SPKR External speaker differential output Analogue audio ±6.5 V ppdifferentialTo drive 16 Ωdifferentially–RF Accessory antenna connection Radio frequency Tx: 5 Wrms (max) 50 Ω –