Make sure that L34 is set properly before you set the AGC. There could be a lot of unwanted (unreceived) noise masking a proper AGC setting difficult or incorrect. I accidentally discovered the following technique while playing with Spectrogram. It is easy and it made a big difference in receive signal and MDS. I had meant to put this hint on the reflector long ago and keep forgetting.
-------- How to best adjust L34 - "I.F. Amplifier Alignment" in the section of "Alignment and Test Part II," using Spectrogram. 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). Viewing the display with either Spectrogram (or equivalent) or even DigiPan (or equivalent - Waterfall works best), 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. You will find a point where the noise is almost non existent. You may need to turn up the volume as you get close to a null. After making this adjustment, reset (align) the AGC. Even though I had adjusted this to what I thought was the best by "ear," after using this method and then re-adjusting the ARC threshold. I was amazed at the difference in sensitivity and audio level. I believe this is one of the problems/reasons some people complain about "low output volume." Rich, KE0X _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
