{ "numMessagesInTopic": 7, "nextInTime": 562, "senderId": "p2b9cR4ppTDwLVoOm2YYMo9eujHhppJolyXJwEUU_4ZKf0tu81O4Im3kdDQP45FXrW1W7aOKDYzMZMZ2eIhaZo5HlEg", "systemMessage": false, "subject": "Re: [GE-Mpa] Re: [GE] M-PA or M-PD finding a COR", "from": "Gary Peterson <NZ5V@...>", "authorName": "Gary Peterson", "msgSnippet": "Just to clairify, after Mark called me and explained this to me; The MPD/MPA has a DAC that reads this UDC sense line and can accurately measure the resistor", "msgId": 561, "profile": "gs79602", "topicId": 554, "spamInfo": { "reason": "12", "isSpam": false }, "replyTo": "LIST", "userId": 157218573, "messageBody": "
\n\n\n \nIt should work with or without a resistor attached to the UDC Sense \nline (Pin-9) in both EDACS and Conventional.\n\nThe primary use of this line is for a Vehicular Charger, to toggle \nthe charger's audio amp to active mode when a call is received.\n\nThe UDC value for a Vehicular Charger is 5360 Ohms (+/- 1%). Try \nattaching a resistor to the UDC Sense line and see if it works in \nConventional.\n\nI have just uploaded a simple chart to the FILES section on this \ntopic:\n\nUDC_mute-bar_output.doc\n\n\n\nMark C.\n\n\n\n--- In GE-Mpa@yahoogroups.com, Gary Peterson <NZ5V@...> wrote:\n\n\n\nMark:\n\nI've not found that Mute line on all MPD/MPA's... conventional \n\nMPD's \n\n\n\ndon't seem to have it, the trunked or VG do... or did I misss \n\nsomething?\n\n\n\nGary\nNZ5V\n\n\nMark Cobbeldick [KB4CVN] wrote:\n\n\n\nHi Vince,\nYes, you can do this!!!\n\n\n\nMUTE (BAR): UDC Pin #11\nOn the M-PA (family) and M-PD radios, there is a MUTE (BAR)\nline available on the UDC. \n\nIt goes LOW when the receiver is muted and high when the\nreceiver is unmuted. It is an open collector type of\noutput, so an external pull-up resistor might be needed to\nbe used. \n\nWide open = HIGH state\nShorted = LOW state\n\nNOTE: This UDC pin changes state regardless of any audio\naccessory(s) being connected to the radio's UDC.\n\n\nI have used this line to build several 1-watt 'lunchbox'\nrepeaters for surveillance applications. I always used a\nPhelps-Dodge RCC/IMTS type six cavity UHF duplexer, cut the\nend brackets in half, and mount it in the lid of a hip-roof\nAladdin aluminum lunchbox. (3 cavities on each side.) \nStick a BNC female connector on the top and connect a\n1/4-wave whip. \n\nSmall, low-power, self-powered and sneaky. :o))\n\n\n\nRegards,\nMark Cobbeldick\n\n\nPS: Sorry for the delay on this. Been busy all weekend\ngetting my garden turned and ready for Spring planting. \nOnly now getting caught-up on e-mails...\n\n\n\n\n\n\n \n\n\n\nMessage: 1 \n Date: Sat, 11 Mar 2006 17:29:53 -0500\n From: Vincent Caruso <vcaruso@...>\nSubject: M-PA or M-PD finding a COR\n\nDose anyone know where I can find the COR on an M-PA or\nM-PD portable?\nI need to make a small cross band repeater and these\nradios would be \nideal. the box would be similar to the CHP motor cycle\nextender.\n\nThanks\n\n\n \n\n__________________________________________________\nDo You Yahoo!?\nTired of spam? Yahoo! Mail has the best spam protection around \nhttp://mail.yahoo.com \n\n\n \nYahoo! Groups Links\n\n\n\n \n\n\n\n\n\n\n\n\n\n\n\n\n \nYahoo! Groups Links\n\n<*> To visit your group on the web, go to:\n http://groups.yahoo.com/group/GE-Mpa/\n\n<*> To unsubscribe from this group, send an email to:\n GE-Mpa-unsubscribe@yahoogroups.com\n\n<*> Your use of Yahoo! Groups is subject to:\n http://docs.yahoo.com/info/terms/\n \n\n\n\n\n\n