OT: Kidde smoke detectors
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OT: Kidde smoke detectors
 
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Heads up!
Keeping with the suggested 10 year smoke detector replacement, and wanting to add a couple more and have them all alarm if one alarms, I bought Kidde wireless interconnected detectors. Well, start installation, read the manual. Under Locations To Avoid: Near amateur radios or other devices known to transmit an RF signal. So, guess I’ll send these back and get some hardwired interconnected units. Harlan K4HES 73 Sent from my iPhone ______________________________________________________________ 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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On 10/24/2020 6:53 PM, Harlan Sherriff via Elecraft wrote:
> So, guess I’ll send these back and get some hardwired interconnected units. That is probably a recipe for noise, radiated by that interconnected wiring. The security industry has long been notorious for EMC to and from their systems. WiFi interfacing should reduce both significantly, but before committing to anything, chat up engineers at the company about RFI. 73, Jim K9YC ______________________________________________________________ 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] |
Re: OT: Kidde smoke detectors
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In reply to this post by Elecraft mailing list
K4HES wrote:
> So, guess I'll send these back and get some hardwired interconnected units. That might be the wrong thing to do. We had a number of wired interconnected units in our house, but the one closest to the shack and antennas started alarming every time I transmitted on 40m with more than 100 W, and because they were interconnected, the alarm was heard everywhere in the house. I replaced that one detector with a battery-only, non-interconnected unit and the problem went away - the non-interconnected unit has no RFI problem, and neither does the interconnected part of the system elsewhere in the house. I would expect wireless interconnected units to be less of a problem than wired ones. If one of them did have an RFI problem, it would be easy to replace it with a no-interconnected unit at the vulnerable location to see if that fixed the problem. 73, Rich VE3KI ______________________________________________________________ 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 Jim Brown-10
I have an older wired alarm system that uses serial data, and it is
indeed awful. The serial data is quite slow but it has no filtering. I added an LC filter that works well enough to keep the RFI out of my station, at least down to the level of what comes from my neighbors and keeps my station from setting off the alarm system (most of the time). At my son's house, he and neighbors have some SimpliSafe and other wireless alarm systems and the HF Ham bands are wiped out by the RFI. I have no idea what nominal frequency range or signalling they use. I would expect for battery life they would not transmit often, but whatever they do to create the RFI is continuous. I also have a hard wired smoke alarm from Kidde. That uses a DC interconnect between units. I believe any unit that goes off pulls a line up to about 9 V and they all go off. They are kind of cagey as to exactly what the interconnect signal is though, so I may be a little off. I have not detected any issues with RFI or susceptibility. Those may indeed work for you. I do have a Spectrum Analyzer and multiple types of clamp on probes and antennas but have not taken the time to do any quantitative measurements of any of these. Having to tell the Fire Department that the fire alarm is false is not a good thing. 73, Mark W7MLG On Sat, Oct 24, 2020 at 7:38 PM Jim Brown <[hidden email]> wrote: > > On 10/24/2020 6:53 PM, Harlan Sherriff via Elecraft wrote: > > So, guess I’ll send these back and get some hardwired interconnected units. > > That is probably a recipe for noise, radiated by that interconnected > wiring. The security industry has long been notorious for EMC to and > from their systems. WiFi interfacing should reduce both significantly, > but before committing to anything, chat up engineers at the company > about RFI. > > 73, Jim K9YC > ______________________________________________________________ > 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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FWIW, we use a Nest Protect here (hardwired into A/C, too) and haven't had
problems with RFI. I imagine it'd be a different story if it didn't use Wi-Fi, though. Speaking of Wi-Fi, our Ubiquiti access point required at least four Ethernet chokes, a third party PoE injector and CAT7 shielded cable to get the RFI down to an acceptable level. That was a fairly surprising thing to have happen but I guess PoE in general is well known to be really bad for RFI (and the limited antenna possibilities at the QTH I'm sure didn't help either). -Mooneer K6AQ On Sat, Oct 24, 2020 at 9:02 PM Mark Goldberg <[hidden email]> wrote: > I have an older wired alarm system that uses serial data, and it is > indeed awful. The serial data is quite slow but it has no filtering. I > added an LC filter that works well enough to keep the RFI out of my > station, at least down to the level of what comes from my neighbors > and keeps my station from setting off the alarm system (most of the > time). > > At my son's house, he and neighbors have some SimpliSafe and other > wireless alarm systems and the HF Ham bands are wiped out by the RFI. > I have no idea what nominal frequency range or signalling they use. I > would expect for battery life they would not transmit often, but > whatever they do to create the RFI is continuous. > > I also have a hard wired smoke alarm from Kidde. That uses a DC > interconnect between units. I believe any unit that goes off pulls a > line up to about 9 V and they all go off. They are kind of cagey as to > exactly what the interconnect signal is though, so I may be a little > off. I have not detected any issues with RFI or susceptibility. Those > may indeed work for you. > > I do have a Spectrum Analyzer and multiple types of clamp on probes > and antennas but have not taken the time to do any quantitative > measurements of any of these. > > Having to tell the Fire Department that the fire alarm is false is not > a good thing. > > 73, > > Mark > W7MLG > > On Sat, Oct 24, 2020 at 7:38 PM Jim Brown <[hidden email]> > wrote: > > > > On 10/24/2020 6:53 PM, Harlan Sherriff via Elecraft wrote: > > > So, guess I’ll send these back and get some hardwired interconnected > units. > > > > That is probably a recipe for noise, radiated by that interconnected > > wiring. The security industry has long been notorious for EMC to and > > from their systems. WiFi interfacing should reduce both significantly, > > but before committing to anything, chat up engineers at the company > > about RFI. > > > > 73, Jim K9YC > > ______________________________________________________________ > > 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] 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] |
Re: OT: Kidde smoke detectors
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In reply to this post by Elecraft mailing list
I have a Gen 1 Simplisafe system in our older MO outbuilding which is partially finished to house my shack. It has been in operation for four years with no RFI issues.
The adjacent outbuilding has a Gen 2 system that was installed last Spring – I need to disable it and see if the grunge on 15 m goes away. I do not think I operated from MO after installing it last spring. It took 3+ hours of dealing with their care folks to get it to work. When we were done I think I had them trained. 73 Bob R ______________________________________________________________ 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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