[Elecraft] K2 KIO2 Polling Noise in PC Speakers w/ HRD

[Don Wilhelm]

Brian,

There may be a potential difference (voltage) between your PC chassis 
and the K2.  Try bonding them together (with a wire) to see if that 
helps.  No guarantees, but it is worth a try.

73,
Don W3FPR

N5BCN wrote:
> (K2 #6800 w/ KSB2 KIO2 KAT2 KNB2)
>
> Hi,
>
> My first post to the reflector. :-)
>
> I recently completed the KIO2 module (without KPA100) and have been
> controlling the K2 via HRD v5.0.  I'm passing the K2 audio via the K2 EXT
> SPKR connection to the the PC Mic In and out to PC Speakers.  All is well
> EXCEPT for an annoying buzzing noise coming through the PC Speakers that is
> caused by HRD polling the K2.  I know this because when I change the polling
> interval, the noise changes accordingly.  Also, when I disconnect HRD from
> the K2, the noise goes away.  Even holding down a button, which pauses the
> HRD/K2 polling, causes the noise to cease.  Of course it starts up as soon
> as I release the mouse button.
>   
>