Following on,
I have a hiss from headphones attached to output jack fed through the polyphase network board. I am able to alter the volume of this hiss. If I touch input pins of IC3, 4 and pin 5 of IC6 I get an ac hum in phones, getting louder through the chain. If I touch the other pins on ic6, pins 1,2 or 3, I get nothing. Voltage on pin 1 and 7 ic6 are correct.?
LO is progrock at 4x receive frequency.?
It looks like everything from capacitors soldered to opamp inputs and polyphase board is good, IC1 is soldered well with no bridges, T3 removed from board to check windings were in correct place, all good. I'm going to use my U3s to inject signal bypassing the tx/rx switch, any other ideas??
The receiver picks up the data burst from the qlg1 gps loudly. Where would this get in given no signals are seen or heard when put onto an antenna??
Andy.
M0RON