[Elecraft] Tuning L34 on K2 - Which Method?

[Ron D'Eau Claire]

It helps to turn the AGC OFF when doing the adjustment by measuring the
audio output level. The function of the AGC is to keep the audio output
constant as the signal level changes. That's exactly what you do NOT
want in this case while tuning for the "peak". AGC doesn't actually
prevent all change in the audio level of course, but the peak will be
more apparent with it off. 

Ron AC7AC
K2 # 1289

Kevin wrote:

There is a third method I discovered. I have mentioned it on this list
but 
haven't gotten around to writing down the procedure until now. You can
call 
it method 0.5 if you like since I came up with it before method 1 and 2
you 
mentioned. :-)

The procedure requires a computer capable of running the Spectogram 
program. In general, the procedure is as follows:

Set up your K2 and computer as if you are getting ready to align the 
filters. The main difference is that you need to tune the K2 so that you

can hear the birdie on the 40m band (usually found near 7MHz).

Start with the slug in L34 near the top of the can. Turn the slug of L34

clockwise to lower it in to the can. As you do this you should see the 
strength (height of the birdie as seen on the Spectogram display)
increase. 
Stop when you reach the point at which additional turning of the slug in

L34 do not cause any further increase to the
signal as seen in the Spectogram display.

Turning the slug in L34 past the point at which no increase in signal 
strength is observed will just result in an increase in noise. It was 
reported on the Elecraft mailing list that the best signal to noise
setting 
for L34 may be about 1/4 to 1/2 turn BEFORE you reach the point of
maximum 
signal.

This is not the only procedure for adjusting the slug in L34 but this 
should help make it easier than adjusting by ear alone.