[Elecraft] S-Meter Sensitivity

[k6se@juno.com]

K6SE wrote:

"I estimate that my K2 requires about 100 uV to read S9 with the preamp
ON, so the logical conclusion is that there's a loss of about 14 or 15 dB
of gain in the receive chain somewhere before the IF amplifier U12 
(where the AGC voltage which drives the S-meter is developed)."
==========
My error here -- The AGC is deleloped on the control board and is fed
back to the IF amp at pin 5 of U12 on the RF board.
==========
Don, KD5NDB wrote:

"Maybe a better piece of information is the actual AGC voltage at the
output of U2A with 50 and 100 uV in with the preamp on and off. I could
make this measurement if you think it would help."
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Please do.  It may be that my receiver gain is okay and the problem is in
the AGC circuitry instead.  Measurements at pins 1, 3, 6 and 7 of U2 on
the control board with 0 and 100 uV would be appreciated.
==========

"If the readings are about the same as your K2 then you may just need to
adjust the S-meter gain to get S9 at 100 uV or 50 uv your choice."
----------
I'm not at all interested in setting my S-meter to one or the other of
the "standrards".  It's just that my K2's S-meter does not even closely
agree with the run-of-the-mill K2, and this tells me there's a problem
somewhere that I'd like to find and cure.

Tnx, 73, de Earl, K6SE
68 countries with K2 #2622 and counting.....