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

[Jim Bolit]

I would take an antenna analyzer and sweep the antenna system (coax with
stubs, connectors,  etc.) by connecting the analyzer at the xmitter "end" of
the antenna system.  Disconnect the coax that goes to the amplifier and take
that coax and plug it into the analyzer instead and sweep the antenna system
with start freq of 3.0 MHz and end point of 8 MHz  You should see a "short"
somewhere in the 40 meter band, but my guess is that it will not be where
you want it to be.  IT is important to do this on the antenna *SYSTEM*
(coax, connectors, switches, etc.).

Jim
W6AIM


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-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jim
Brown
Sent: Monday, February 22, 2016 8:42 PM
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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