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-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim
Brown
Sent: Monday, February 22, 2016 8:42 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Slighty off topic - 80 meter second harmnic how to
stop
When I posted on this issue to another l
When I lived in California I had a 80/160m inverted L in which the horizontal
part passed over the house. There were alarm wires running through the attic,
and when I first tried it I actually vaporized a terminating resistor at one of
the windows. Those wires were quite long and possibly resona
I would expect that if it was getting into an alarm system, the alarm would
fail in some way. I had a bad problem with mine, cured by a 5th order 200
kHz lowpass filter where simple ferrites and caps did not work. The alarm
system has low frequency digital data. I built it with some caps and a few
Hello again folks
Thanks to all for the suggestions and hints to what this problem could be.
Tests have been done at 2 locations; my own home station and here at another
property ( work in progress as we
politely say..) about 125km south of Auckland.
The same second harmonic garbage is heard
: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Slighty off topic - 80
meter second harmnic how to stop
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On Mon,2/22/2016 11:31 PM, David Cutter wrote:
I understand that small ferrites are easily overloaded and become
non-linear generating harmonics and injecting a signal back into the
wire from whence they came.
That's theoretically possible, but VERY VERY VERY unlikely.
73, Jim K9YC
_
t] 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
wn
>Sent: 23 February 2016 04:42
>To: elecraft@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 cha
.
David, G3UNA
- Original Message -
From: "Jim Brown"
To:
Sent: Tuesday, February 23, 2016 4:42 AM
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
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
Hi folks
slightly off topic
running 2 x K3 80 and 40 meter cw. Separate antenna
about 50 meters apart. 100 watts.
Power supply 14 volt dc via batterys + dc charge.
The 80 meter second harmonic is very strong. No surprise so have done
the usual 80 meter band pass filter and quarter wave stub
F
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