Ok, I have been radio plagued this past week. I have a 40W UHF Maxtrac that has a bad pa. Look in the photos section, you can where I found a burnt spot and a missing piece across the legs of the transistor. The piece fell out and is charred beyond reconigition.
That's problem 1. Second, I have a 40W UHF GM300 that has something wrong in the audio amp and cannot stay on frequency worth a crap. I read something on batlabs about the drifting but nothing about the audio amp. So I pulled both radios out of the truck (put an icom in temp, I feel dirty, first time in 12 years not having any moto eq in the vehicle)to see what I can do. My first thought was to see if I could use the PA off the GM300 on the maxtrac. Got most of the way into that and discovered that they have a different control plug. See the side by side pictures in the photo section of the group. The GM300 has one extra wire (white to be exact). I seem to remember that one of the differences between the series is the fact the GM series actually senses temp, where the maxtrac has a timer to prevent overheating. Is that the white wire? If so, can it be defeated so i can use the pa on the maxtrac? Or should I use the final (the actual transistor) out of the GM to revive the maxtrac? The number match, though the last 3 letters on the transistors are different. Any suggestions or advise would be appreciated. Component level troubleshooting is my weak spot. I would like to get one working radio out of two here if I can. Thanks!!! Tom W9SRV
