Mike,
First set the AGC Threshold voltage, and then check the operation of the
RF Gain to see if you can get the CAL S LO and CAL S HI settings to fall
in line.
It is not likely that replacing the pot will fix it.
For a scratchy AF Gain control, replace the control, as well as doing
the Alternate AF Gain Wiring Modification. You can download the
instructions from the Elecraft website.
73,
Don W3FPR
On 8/16/2021 10:27 AM, Mike Seiffert wrote:
Hi Folks,
I have an Elecraft K2/100 (S/N 01136) given to me by father (SK) some years
ago. I am finally finding some time again for ham radio and would like to get
this rig up and working well. It has the A to B mods applied, and includes the
options for SSB, DSP, 160/Rx ant, etc. I have applied the BFO and PLL upgrades.
My current problem is that the RF gain knob doesn’t seem to do anything. I was
expecting to hear some difference in the level of received signals and to see
the S-meter go to the right as I turn the knob fully CCW. Turning this knob
seems to have no affect on anything.
Any help would be appreciated! I mention the following details in case they
are relevant: my father was mostly interested in 160m cw, so I’m not sure if
other aspects of the radio received attention when he built it. The AF gain
knob is scratchy - I’ve read about the mod that addresses this, but haven’t yet
applied it. The AGC needs adjustment - I can tell the difference in volume AGC
On vs off with no antenna connected. I don’t know that any of these are related
to the RF gain.
Before I open things up to measure and replace the RF gain pot, are there other
things I should check? A quick check of the email reflector archive didn’t
turn up anything obvious to me.
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