[Elecraft] K2/100 RF gain knob inoperable

Don Wilhelm don at w3fpr.com
Mon Aug 16 11:59:31 EDT 2021


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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