You can disconnect the driver board and connect a jumper from it to a dummy load and check the power each stage is 50 ohms impedance. I have seen the power regulator transistor open up before, but it kills the power to the collector of the transistors in the driver. Pray that this is the problem it's the same one used for the audio PA. If you have up to about 40 watts then It is the main deck. It's usually cheaper to just replace it if it's bad. What you remember reading is likely the problem with the bonding strap that feeds power from the PA to the Output filter opening up or comming unsoldered. Good luck
--- In [email protected], Joe <[EMAIL PROTECTED]> wrote: > > I'm slowly going through all my repeater stuff here and have a problem > with the 100 watt UHF PA PL19d424895g32. No output. I checked the > exciter into another identical PA and it works fine. Drive is a little > low, 100mw, but it drives the other identical amp just fine. The bad PA > draws 5 amps when keyed, the power control pot varies this current from > 0-5 amps. No output out of the PA. This was a working repeater that is > being tested on it's original frequency of a 45/1456Mhz split. No parts > look burned or discolored. The straps between the boards look fine, no > cracks. I touched them up with and iron anyway just to check. My first > thought is to check the output of the 40watt stage. > > Any words of wisdom before I tear into this beast? Any ideas? I seems > to remember reading about a UHF PA common problem but can't find it in > any of the reflector archive messages. > > 73, Joe, k1ike >
