I received a lot of answers but Rick, KE0X, has what seems to me to be the best explanation on how to set L34. I just tried it and it seems to work. I want to revisit setting the AGC now but I can see exactly what Rich is talking about. Here is what he recommends:
Here is a technique I used to adjust L34 - While performing the "I.F. Amplifier Alignment" section of "Alignment and Test Part II," I used Spectrogram (just about any program that displays the received signals should work). I had meant to put this hint on the reflector long ago and keep forgetting. Follow the instructions for "I.F. Amplifier Alignment." When you get to the last step plug the PC sound card into the Speaker Jack (not Headphone as it attenuates some high frequencies - but it probably don't make that much difference). You will notice some noise spread across the spectrum displayed. Make sure the XFIL is set for FL-1 OP-1. Now continue to adjust L34 for a compromise of the lowest displayed noise and the highest level of the tone (signal). You will find a point where the noise is almost non existent. Even though I had adjusted this to what I thought was the best by "ear," after using this method and then re-adjusting the AGC threshold, I was amazed at the difference in sensitivity and audio level (I think the noise de-senses the AGC - perhaps the experts can explain this). Maybe this is one of the problems/reasons some people complain about "low output volume." Thanks Rich! I received a lot of direct replies and apparently more than just me are/were confused by this adjustment. 73, Charlie, W0YG..>> _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
