Smoke detectors
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The reason to keep smoke detectors from Amateur Radios is that they detect
smoke by ionization from a radioactive source. A strong near field will set them off. The good news is that this is your indication that all is not right at the feed line (Or the antenna is unhealthy close). I have had this experience myself, fixed the feed line and the issue went away. That was with 100w on 80 meters. Unlike real smoke, the detector will stop complaining when the transmission stops. -73- Geoff W1GCF ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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About 12 years ago we had a carbon monoxide detector in the upstairs hallway not far from the shack. Every time I was on a 2m net (could have been 6m, I forget...)the detector would start chirping, I even lowered power from 65 to 25 watts, same issue. Eventually the thing wouldn’t stop chirping at all so we threw it away, put a smoke detector in it’s place, got a 10 year carbon monoxide detector and put it in the guest bedroom which is further away from the shack and never had a problem again.
73 de Jose Douglas KB1TCD Mid Coast ME Sent from my iPad > On Oct 25, 2020, at 6:36 AM, Geoffrey Feldman <[hidden email]> wrote: > > The reason to keep smoke detectors from Amateur Radios is that they detect > smoke by ionization from a radioactive source. A strong near field will set > them off. The good news is that this is your indication that all is not > right at the feed line (Or the antenna is unhealthy close). I have had this > experience myself, fixed the feed line and the issue went away. That was > with 100w on 80 meters. Unlike real smoke, the detector will stop > complaining when the transmission stops. > -73- > Geoff W1GCF > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[hidden email] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [hidden email] Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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I had a battery-operated smoke detector that was set off by my
transmissions. I totally wrapped it in aluminum foil and punched holes in the foil to match the openings in the plastic housing. No more trouble. Of course this wouldn't work with a WiFi unit. But in my experience, WiFi appliances have always been less affected by my HF and 144MHz signals than wired ones whose wires act as antennas. 73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5 http://www.qsl.net/k2vco/ On 25/10/2020 13:13, JP Douglas wrote: > About 12 years ago we had a carbon monoxide detector in the upstairs hallway not far from the shack. Every time I was on a 2m net (could have been 6m, I forget...)the detector would start chirping, I even lowered power from 65 to 25 watts, same issue. Eventually the thing wouldn’t stop chirping at all so we threw it away, put a smoke detector in it’s place, got a 10 year carbon monoxide detector and put it in the guest bedroom which is further away from the shack and never had a problem again. > 73 de Jose Douglas KB1TCD Mid Coast ME > > > Sent from my iPad > >> On Oct 25, 2020, at 6:36 AM, Geoffrey Feldman <[hidden email]> wrote: >> >> The reason to keep smoke detectors from Amateur Radios is that they detect >> smoke by ionization from a radioactive source. A strong near field will set >> them off. The good news is that this is your indication that all is not >> right at the feed line (Or the antenna is unhealthy close). I have had this >> experience myself, fixed the feed line and the issue went away. That was >> with 100w on 80 meters. Unlike real smoke, the detector will stop >> complaining when the transmission stops. >> -73- >> Geoff W1GCF Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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In reply to this post by Geoffrey Feldman
Radio waves are non-ionising radiation, so there is no fundamental
reason why radio frequencies should trigger ionisation detectors. Also, at least in Europe, ionisation detectors are no longer the preferred type. Optical detectors are the generally preferred type, and ones which combine heat and optical detection seem to be most favoured. Actually ionisation detectors alarm when the current reduces, so additional ionisation would probably de-sensitise, rather than trigger them. They include an alpha emitter to generate the ionisation, so are radioactive. The main advantage is that they are cheap. -- David Woolley On 25/10/2020 10:36, Geoffrey Feldman wrote: > The reason to keep smoke detectors from Amateur Radios is that they detect > smoke by ionization from a radioactive source. A strong near field will set > them off. The good news is that this is your indication that all is not > right at the feed line (Or the antenna is unhealthy close). I have had this > experience myself, fixed the feed line and the issue went away. That was > with 100w on 80 meters. Unlike real smoke, the detector will stop > complaining when the transmission stops. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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