Re: K2 signal tracing progress and questions arising

Posted by Paul Fletcher on Nov 22, 2009; 11:27am
URL: http://elecraft.85.s1.nabble.com/K2-signal-tracing-progress-and-questions-arising-tp3982841p4045825.html

Don Wilhelm-4 wrote

A drop in signal at the receive output of the LPF could also be caused
by a T/R switch problem.

Update so far. Having terminated the LPF's in a 50 ohm resistor I can definitely confirm all of the LPF's are fine. I measured swr and monitored in / out on the scope and loss is negligible. As soon as I reinstate W1 the output of the LPF is pulled low (50% of level when terminated with 50 ohms). I guess the next step is to do the same check with the chain broken after the T/R switch and progressively work down the chain. The is no ground short on the input to the band pass filters at DC. I can't directly terminate the T/R switch at W6 because of the DC bias so what value blocking cap should I use?

Any other thoughts appreciated.

73 Paul M1PAF