PA M44GRC90C2AA is from the R1225 Repeater transciever chassis. They are 45 watts but overheat from lack of cooling. This should be the heatsink with the longer fins..perfered. Look for very poor crystalized solder joints due to overheating.
--- In [email protected], Joe <k1ike_m...@...> wrote: > > I'm helping a new repeater owner get a GR300 repeater working properly. > It uses the gm300 radios. The transmit radio shows in software as an > M34GMC09C3 radio, (UHF, 25 watt, narrow band) but the PA is marked > M44GRC90C2AA (Not sure of what this is). It looks like at 25 watt PA > was replaced with a 45 watt PA, but I don't know what radio the 45 watt > PA came from. > > Anyway, it is suffering from intermittent desense and the crackles. > Substituting the transmitter with another one of the same power level > fixes the problem, so it looks like it is definitely in the > transmitter. Sounds like a bad solder joint in the PA because the > trouble starts to go away as the transmit radio heats up. It's now set > to 20 watts output. I would like to take the PA apart, but I'd like to > know what I'm tearing into. Can anyone ID this PA M44GRC90C2AA? It > doesn't fit the GM300 scheme of decoding. > > 73, Joe, K1ike >
