[Elecraft] K2 scratchy noise on RX CW signals

[Andrew Moore]

I replaced the KDSP2 with a newly built KAF2 today and am happy to report
the noise is gone. Not sure if the board swap had anything to do with it,
but everything sounds great now and hope that continues.

Thanks,
-Andrew / NV1B
..


On Wed, Feb 16, 2022 at 10:08 PM Andrew Moore <andrew.nv1b at gmail.com> wrote:

> Hi Elecrafters -
>
> Today I took delivery of K2 #892 and very happy to have it in the shack
> after selling my #4958, I think it was, years ago... if anyone has it I'd
> like it back please). This #892 has a "static sounding" scratchy/raspy
> noise on top of CW signals. It sounds similar to what you'd hear from an
> oxidized audio frequency pot. The strength and presence of the noise is
> proportional to the incoming CW signal strength.
>
> The rig is running from a clean, large high current capacity battery so
> I'm sure the supply power is good. The noise occurs across multiple bands.
> I get the sense it's something in the audio chain. The installed KDSP2
> digital audio filter has already been put in bypass mode and the scratchies
> persist.
>
> Before I continue debugging I wanted to see if anyone had suggestions
> about what components to target.
>
> Thanks,
> -Andrew / NV1B
> ..
>
>
>