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

[paulb]

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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