Re: Repurposing Mitrek PL Board? The typical mobile two-way radio including the Mitrek is a half duplex operation. During receive the board decodes the ctcss tone and provides a logic line output to turn on the audio amplifier (speaker audio).
Note at least one contact pin of the board interface plug is a logic line function that changes state with transmit mode. The board then changes over to tone encode mode during tx and spits out the tx sub tone from that audio section of the board. There is only one tone reed or frequency select part on the stock board so only one tone choice is used for transmit and receive. Moving along... when the board is populated with all the parts you can receive decode one tone and transmit a different tone when the board switches over to tx mode. We call it cross code and it's very useful in some multi site systems. I haven't tried it with the Mitrek board but I do know the MSR-2000 Repeater board will allow transmit and receive ctcss (tone) operation at the same time (full duplex). Per my previous post the chips are the same as the Mitrek board with different motorhead part numbers (go figure). So there is a chance the fully populated Mitrek Board might allow full duplex or at least cross code ctcss operation if the two sections can be enabled at the same time. Sometimes that's allowed as a normal option for various product but I don't believe the Mitrek was ever offered up as a full duplex radio. I would not expect the tone board to operate full duplex without some modification. Just for the sake of fun trivia... your board also fits the Motrek radio. Getting dizzy yet? s. > Kris Kirby <[EMAIL PROTECTED]> wrote: > So would this board be an encode-only board or decode-only? > I fear encode only... > Kris Kirby, KE4AHR <[EMAIL PROTECTED]> > > On Fri, 25 May 2007, skipp025 wrote: > > If the board is untouched (no parts removed) then it's possible > > that board version has the capacity to cross-code tones when the > > other missing parts are installed.
