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

[John Severyn]

Don't forget rain gutters and downspouts that may be slightly corroded 
at the joints, forming a diode.
They make nice frequency doublers due to the non-linear element.
John  AF6QO

On 2/22/2016 11:58 PM, Ian White wrote:
> 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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