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Maxtrac 136-162, odd jumpers on logic board.

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May 10, 2013
Cass WVa
So, just to experiment with, I ordered a 2ch 25w 136-162mhz Maxtrac 5pin ($10+s&h) with plans to convert it to 16ch (I have the parts) or buy a 800mhz Maxtrac w 16pin logic board ($7+s&h) and build a 32 ch radio.

This will be the first time I'v tried this so any tips would be appreciated.

I got the 2 ch radio today, (D33MJA73A5_K came programed w ch1-142.925 csq) works good but the tuning data sticker is missing from the RF board (any ideas how to work around that?) and it won't turn off (?) seems there is a jumper soldered across pins 5 and 6 on the (J8) connector to the front panel and another from the logic board to pin 9 (again, J8). 5&6 trace to the on/off switch (why would they do that?) but I'm not sure what the other jumper is for.. (?) it traces to the mic jack.

I'v been reading up on doing this on repeater-builder.com.

Any ideas or tips??

EDIT; Found the Tuning Data sticker, it was stuck on the side of the shield rather then the board itself! :)
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Lots and lots of watts
Premium Subscriber
Dec 5, 2008
Calif Whine Country
Without a tuning sticker you're kinda boned as you can't guess at the values, so good find that it is there.

Shorting the power switch is used whenever you don't want somebody snooping around and turning off your stuff by accident. Seen it used in SCADA radios, links, etc.

P8 pin 9 is not used. It goes to the mic jack, but on the radio side it's a dead end road. People use this to bring out logic signals or audio to the mic jack that ordinarily aren't there. Look on the radio side of P8 to see if there is a renegade jumper tying pin 9 to something.
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