[Elecraft] K2/100 RF gain knob inoperable

jerry jerry at tr2.com
Mon Aug 16 12:09:57 EDT 2021


All,

   The AF gain pot on my K2/10 was quite scratchy when I got it.  A few 
days
of ham activity, plus some whacking it back & forth, cured it.  No more
scratches.  Worth trying.

                    - Jerry KF6VB


On 2021-08-16 08:59, Don Wilhelm wrote:
> 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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