At 02:53 AM 06/22/10, you wrote: >We have 2 repeaters that are more or less the same. One is on 2 >meters and the other is on 440. They both exhibit the same problem, >they lockup after a while and then need to be power cycled. They ran >for years without issue. > >We have the Instruction manual for the Zentron controller, but >nothing on the radios. The 440 radios are Motorola M44GM29C3AA's >back to back. That's the only model number on the radios. Does >anyone have any information on them? A Google search shows 2 Chinese >sites having them for sale on e-bay, that's it. Seems strange. > >Any information would be greatly appriciated, > >Joe Loucka -- AG4QC
You missed one letter in the model number. That may be one reason that you are having problems with locating info. And it's not Zentron, it's Zetron. The correct number is either M44GMC29C3AA or M44GMR29C3AA For all the info you want, and more, go to <www.repeater-builder.com> - just click Motorola, then "MaxTrac, Radius and GM300 series Information and Modifications". There are number of articles on the radios, and make sure you read the "Introductory Information about the MaxTrac, Radius, GM300, etc radios" page. And Zetron has it's own page at repeater-builder.com I'll bet that the lockups are in the Zetrons. I've resolved some by unplugging and plugging in all the socketed chips. Mike WA6ILQ
