[Elecraft] Re: Adjustment of L34 on a K2

[Charlie, W0YG]

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..>>