![]() The main board) to compensate for not having a pre-amp in the low cost mic. Low cost mic operation where the gain of the microphone path is increased (on (programming) operation and firmware loading. When the HOOK line is connected to +9.3v DC, the µP sets the mux for SCI Of microphones with a keypad (DTMF and programmable buttons). (2.8V nominal), the µP sets the mux (U803) for keypad operation to allow the use When the HOOK line is grounded (on hook condition) or floating HOOK line is monitored by the µP (port PE0, MIC_SENSE) through a resistor divider Microphone or SCI lead is connected to the microphone socket. The HOOK line (J802-6) is used to inform the µP which type of Well a bit more research might lead you to the "Commercial Series" Program MaxTracs, GM300s, GTXs, and many other modular jack-equipped radios Pin the Serial Communications Interface). Programming: Serial Communications Input (SCI) and Ground (some books call the Some quick research verifies that the same two pins are used for No radio-to-computer communications at all. In your standard trusty RIB and modular programming cable, and the radioĭoes not respond. Jack on the front of the radio, so you fire up the appropriate CPS, plug You notice there's a standard modular microphone You acquired a CM200, CM300, PR400 (or some other member of the Commercial Series) Updated by Mike Morris WA6ILQ February 2022 Making a Programming Cable That Works With a "Commercial Series" mobile radio (CM200, CM300, PM400 and similar) ![]()
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