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

[Brian N5BCN]

Hi Don,

Thanks for the tip (why didn't I think of that?!?).  I tied a wire between
the PC and K2 chassis and the polling noise dropped dramatically.  Although
it is still audible, it is diminished to the point where I can "live with
it."  Hopefully the wire wouldn't introduce any ground loops........

THANKS!

73

Brian N5BCN



Don Wilhelm-4 wrote:
> 
> 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.
>>   
>>
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K2 #6800 KSB2 KAT2 KIO2 KNB2
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