[Elecraft] Slighty off topic - 80 meter second harmnic how to stop

[Ian White]

I feel sure that Jim and W3LPL are right. That rasping note is a big,
big clue that some *other* electronic device is also involved -
something else, in addition to your two K3s.

That "unknown third party" device is what you need to find. Begin by
switching off power to whole sections of the house,  and then go around
methodically unplugging individual devices. Murphy says: it's something
of yours, and it's right there in the shack.


73 from Ian GM3SEK

>-----Original Message-----
>From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
>Jim Brown
>Sent: 23 February 2016 04:42
>To: elecraft at mailman.qth.net
>Subject: Re: [Elecraft] Slighty off topic - 80 meter second harmnic how
to
>stop
>
>When I posted on this issue to another list, W3LPL responded that it's
>fairly common for harmonics with this sort of characteristic to be
>generated in active electronics like switching power supplies.  Sort of
>identifying which is the culprit and choking every cable connected to
>it, there's no solution.
>
>73, Jim K9YC
>
>On Mon,2/22/2016 8:34 PM, paulb wrote:
>> For what ever reason the harmonic is still very present..darn..
>> oddly has a rasping note not pure carrier.
>>
>> A close ham about 400 meters away can also hear the 2nd hamonnic,
>> band pass in or out makes little change.
>
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