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

[Vic Rosenthal]

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 resonant lengths.
I solved the problem by installing no. 31 ferrite toroids on the alarm wires and also the power supply wires at the alarm control box. I wrapped as many turns of wire as I could on them. That might fix your issue.

Vic 4X6GP

> On 23 Feb 2016, at 11:03 PM, paulb <xtr348165 at xtra.co.nz> wrote:
> 
> 
> 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 at both places. Over the last day
> I have completely swapped out
> all the 80m and 40m antenna and feeder components here in the provinces. No
> change.
> 
> What I now strongly suspect is the only common point at both locales;
> 
> both properties have burglar alarms installed.  Both are almost identical
> well known European name brand units.
> There is no detectable RF radiation from the processors or wiring.
> The clincher now that I think about the last time we ran 2 stations here
> without any drama
> was before the alarm was commissioned here.
> 
> I have dropped the supply and backup DC to the alarm here without any
> change,
> Likely 3.5 meg RF is simply hammering the PIR's, cable runs are in the roof
> cavity.
> Can't %100 prove this without fairly major re-wiring, will leave it as is
> for the meantime,
> 
> thanks again guys
> 
> cheers from ZL
> 
> Paul 
> zl1ajy
> 
> 
> 
> 
> 
> 
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