[Elecraft] K2 AGC Threshold - R1

[Earl W Cunningham]

George, K1GXT wrote:

"After bringing my K2 (#1632) up to the rev B level, I was interested to
learn that the AGC threshold is not what it should be, per the test
prescribed in the A to B document.  I do indeed hear a noticeable
increase in noise everywhere between 20 and 12M, but not quite as
pronounced on 10 M.  The bands were quiet in all cases.

The documentation says to adjust the value of R1 by substituting a pot,
and cranking on it to find a good compromise between IF gain and AGC
action, then put in a  new fixed R1 at that value.  

Just wondering if anyone else has done this, and what their experience
has been relative to the final value of R1, and the difference in
sensitivity."
==========
I played around with R1 quite a bit on my K2 (#2622) before I arrived at
the value of about 22k ohms for it.  I still hear the weak signals as
well as when R1 was the original 51k.  The biggest difference I noticed
is that the S-meter now reads similar to my other radios, where S9 with
the preamp off is about 50 uV.

73, de Earl, K6SE