I will be interested in what you folks come up with. One night, the band was open late and I was working 5 watts QRP CW on 20 meters using my tri-band beam. The smoke detector went off, woke my wife and she panicked. Ham radio was not popular in our house.
I later tuned up my 80 meter loop and could go 100 watts without setting it off using the same frequency. The loop is fed with open wire. The beam has a balun and is fed with coax. I always have a low pass filter in line. I later bought a MFJ-915 RF Line Isolator and installed it on the coax to the beam. So far, so good. Then again, direction of the beam could be a factor. Rich, n0ce ----- Original Message ----- From: Jim Wiley To: haircut...@verizon.net Cc: elecraft@mailman.qth.net Sent: Friday, February 01, 2013 11:40 AM Subject: Re: [Elecraft] annoying problem If it is a wired-in smoke detector, try putting a .01 uFd 1400-volt "AC rated" cap directly across 120-volt AC power leads. If that isn't enough, then try a capacitor the between (across) the wire, if there is one, that connects it to the other detectors and the AC neutral lead. If the unit is battery powered, try a .01 uFd 600 V cap across the detection chamber. That may work, but if not, get used to the idea of having to move it. Always test and verify proper operation of the unit by blowing actual smoke from burning wood matches into the unit after making any modifications of this nature. Pressing the "test" button is not enough - use actual smoke. - Jim, KL7CC On 2/1/2013 7:48 AM, haircut...@verizon.net wrote: > I was wondering if i can cure an annoying problem when I am sending cw on > the hf bands above 15 meters. > I have a small mini beam on the roof and my shack is directly under it. > When I work the bands above 15 meters my smoke alarm beeps. Its in the hall > between the bedrooms, so don't want to move it. > Is there a way I can filter this problem without moving the smoke > detector? > Dumb question, but hate to move the detector.. but will , if I have to.... > > Don...w2xb > > > > -- > View this message in context: http://elecraft.365791.n2.nabble.com/annoying-problem-tp7569472.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 > ______________________________________________________________ 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 ______________________________________________________________ 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
