Hi Gang,
Well, I'm at it again. I have on the bench an SB 520 that had no transmit. The owner said he had high SWR's and it quit. I checked the final with my transistor tester and it was bad so I replaced the driver and final with brand new (not fakes) 2166 driver and 1307 final. I also replaced the tantalum cap (179) with a 25 volt version. It still did not transmit. I had .7vdc on both bases and 9 volts on the collectors. The collectors are supposed to be 4.7vdc based on the...
Robyn SB-520 (858 board) no transmit power
Well, I'm at it again. I have on the bench an SB 520 that had no transmit. The owner said he had high SWR's and it quit. I checked the final with my transistor tester and it was bad so I replaced the driver and final with brand new (not fakes) 2166 driver and 1307 final. I also replaced the tantalum cap (179) with a 25 volt version. It still did not transmit. I had .7vdc on both bases and 9 volts on the collectors. The collectors are supposed to be 4.7vdc based on the...
Robyn SB-520 (858 board) no transmit power