I had a similar problem with a battery-operated CO detector. I covered it with aluminum foil, and punched through the foil everywhere there was an opening in the plastic case of the CO detector. No further issues.
On 7/27/12 10:44 PM, Richard Fjeld wrote: >> I am looking at this as an rfi issue first and foremost. I am going >> to clean up a little bit inside the shack. That particular K3 has >> been suffering with unusual noise with my new SteppIR three element >> that was put up less than a month ago. > > I have an 80 meter loop fed with homebrew ladder-line to an Ameritron > ATR-30 tuner with an internal 1:1 balun. No (known) RFI on all > bands, 80-10. > > But, I have a commercial tri-band beam fed with coax. (It has a balun > at the feed-point). When I am operating 20 meter CW, it sets off the > battery operated smoke detector in the hallway to our bedroom. Go > figure! Not good when operating at night with my wife sleeping. She > panicked. That alarm is extremely piercing. > > I put a MFJ-915 RF Isolator in line with the coax. So far, so good, > but need more time on 20. It may be frequency specific, also. If it > continues to be a problem, I will relocate the smoke detector to the > garbage can. > > Richard Fjeld, N0CE -- Vic, K2VCO Fresno CA http://www.qsl.net/k2vco/ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
