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Modified Maxtrac acting up

The General forum is where users can discuss any topic regarding Motorola communications equipment - hardware, software, etc. There are also several focused forums on this board, so please take the time to ensure that your questions doesn't fall into one of those categories before posting here!

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Posts: 21
Joined: Mon Jul 02, 2007 8:39 pm

Modified Maxtrac acting up

Postby 1585hp » Fri Nov 04, 2011 11:16 am


I modified a Motorola Maxtrac, D51MAJ97A3AK with version 5.04 firmware for the 6m ham band.

After modifying, the volume is at full volume, and the volume pot doesn't control it.

The hardware mods went great, great RX, TX, etc, but this is the only issue. I think maybe I screwed up the MDF mod? This was originally an 8 channel radio that I turned into 16.

Does anyone have a good hacked MDF file I could try?

e-mail me at



Posts: 1045
Joined: Tue Sep 04, 2001 4:00 pm

Re: Modified Maxtrac acting up

Postby Al » Fri Nov 04, 2011 11:49 am

Check the bottom of the volume control for a missing ground. Since there's no softpots in the receive chain it's unlikely that any firmware or software changes that you made would cause what you describe.

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