[Elecraft] Re: AGC adjustment

[Sverre Holm - LA3ZA]

I am completely happy with both my AGC-action and S-meter after I did
the following:

1. Adjust AGC threshold so that AGC on/off does not change perceived
level on noise in a quiet band. I have installed a pot for R1 - and it
really helped increase audio gain. Of all the rev A to B mods, this was
the one that really made a difference.

2. Follow Don Brown's setup for setting S-meter sensitivity, after you
are happy with the AGC-setting 
(http://www.qsl.net/ve3mcf/elecraft_reflect/K2_S-Meter_Sensitivity.txt)

2a. First set CAL S LO as per the manual (page 84 in my rev C April,
2000 version). 

2b. Then adjust CAL S HI by setting RF GAIN to the 9 o'clock position
(instead of fully CCW) and set parameter so that right-most bargraph is
barely turned on. I have played with various other setting such a 10, 11
o'clock, but found the 9 o'clock position to be fine. It also agrees
reasonably well with 50 uV from my generator to give S 9. 

If the AGC-setting is changed, the S-meter calibration has to be redone.

I use the S-meter all the time to give signal reports. Being a new ham,
I have yet to develop the proper ears for this, so I want it to work
properly.  Also, I can understand the discontent one feels if the rig is
perfectly set up, except for a useless S-meter. If it is there, it
should work!

In my view it will only make things difficult if yet another variable is
introduced (R5), so for me R1 and CAL S HI is enough to get both an AGC
and an S-meter to work properly.


73, 
Sverre

------------------
Sverre Holm, LA3ZA
www.qsl.net/la3za