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 <xtr348...@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 > > > > > > > -- > View this message in context: > http://elecraft.365791.n2.nabble.com/Slighty-off-topic-80-meter-second-harmnic-how-to-stop-tp7614506p7614534.html > Sent from the Elecraft mailing list archive at Nabble.com. > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to k2vco....@gmail.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
