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1. [RFI] RFI With Smoke Detectors (score: 1): Author: Stan Zawrotny <k4sbz.stan@gmail.com>; Date: Mon, 17 Aug 2015 15:16:41 -0400; I have an RFI problem with my smoke detectors. The house has USI Electric Inc. Model USI 1208 smoke detectors installed throughout. Mostly when I operate on 40 meters, but also on 80, 15 and occasion; /archives//html/RFI/2015-08/msg00043.html (8,144 bytes)
2. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: "Frank N. Haas KB4T" <utility.rfi.pro@gmail.com>; Date: Mon, 17 Aug 2015 15:41:40 -0400; Stan: Does the interference to the smoke detectors occur at very low RF output...say 5 or 10 watts? Or does it occur only AT higher output levels. Can you get schematics for the smoke detectors? Have; /archives//html/RFI/2015-08/msg00044.html (7,283 bytes)
3. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: "EDWARDS, EDDIE J" <eedwards@oppd.com>; Date: Mon, 17 Aug 2015 20:32:30 +0000; " I disconnected the smoke detector in my office and the smoke detector in the foyer began to chirp. Because they are RF connected, another one in a distant part of the house also chirps." ...and...; /archives//html/RFI/2015-08/msg00046.html (10,509 bytes)
4. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 17 Aug 2015 13:45:35 -0700; It is VERY unlikely that the problem is caused by harmonics of the transmitter. FAR more likely that radiation from your antenna is coupling to wiring for the smoke detectors, which act as receiving; /archives//html/RFI/2015-08/msg00047.html (8,912 bytes)
5. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Stan Zawrotny <k4sbz.stan@gmail.com>; Date: Mon, 17 Aug 2015 21:34:20 -0400; They didn't chirp because they were removed. They were chirping because of the RFI. another? When one detector has an "event," it communicates with the entire network. This is normal. detectors? The; /archives//html/RFI/2015-08/msg00048.html (12,632 bytes)
6. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Don Kiser <ac2ev@frontier.com>; Date: Tue, 18 Aug 2015 06:00:08 -0400; Is replacing the units with a different manufacturer an option? They should be replaced every 10 years. I was having issue with 40m RFI getting into my CO detectors. Switched to a different brand. I; /archives//html/RFI/2015-08/msg00050.html (7,707 bytes)
7. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Howard Lester <howard220@gmail.com>; Date: Tue, 18 Aug 2015 07:17:29 -0400; To clarify for others, I don't think you mean the detectors are battery operated. Rather, they (like mine in my hard-wired system) have batteries (typically 9V) used for backup power. Howard ________; /archives//html/RFI/2015-08/msg00051.html (8,332 bytes)
8. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Richard Battles <wb4byq@gmail.com>; Date: Tue, 18 Aug 2015 09:42:45 -0500; Replaced the group with independent units that use batteries. the reason was that I noticed that the circuit board was showing signs of heat stress around a diode and resistor inside the unit. The se; /archives//html/RFI/2015-08/msg00052.html (9,372 bytes)
9. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Howard Lester <howard220@gmail.com>; Date: Tue, 18 Aug 2015 11:26:19 -0400; Stan, my hardwired alarms are First Alert 9120B, Lowe's item #304196 I bought as a 6-pack. I have no RFI problems with them. Maybe you should consider switching out what you have. ? I run 100 watts 1; /archives//html/RFI/2015-08/msg00053.html (9,576 bytes)
10. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Tue, 18 Aug 2015 09:48:34 -0400; I have 3 smoke detectors and 3 CO detectors. The CO are independent and run off 120 VAC, the smoke detectors are independent and battery operated. No AC connections. No RFI, 160 through 440. I run th; /archives//html/RFI/2015-08/msg00054.html (10,547 bytes)
11. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Stanley Zawrotny <k4sbz.stan@gmail.com>; Date: Tue, 18 Aug 2015 11:13:38 -0400; Unfortunately, replacement is not an option. It is a two family house that I built with my daughter and her husband. We have the "mother-in-law" side. There are about two dozen of them wired througho; /archives//html/RFI/2015-08/msg00055.html (10,677 bytes)
12. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Aug 2015 11:23:50 -0500 (CDT); replacement is always an option for smoke detectors... most of them have a limited lifetime because the radioactive source they use decays to a point that they don't work any more. Unfortunately, rep; /archives//html/RFI/2015-08/msg00056.html (10,832 bytes)
13. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Stanley Zawrotny <k4sbz.stan@gmail.com>; Date: Tue, 18 Aug 2015 14:58:42 -0400; But this is only a three-year-old house. Stan, K4SBZ _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2015-08/msg00057.html (11,596 bytes)
14. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Stanley Zawrotny <k4sbz.stan@gmail.com>; Date: Tue, 18 Aug 2015 15:00:04 -0400; And I am not the primary owner. Stan, K4SBZ _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2015-08/msg00058.html (11,470 bytes)
15. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Stan Zawrotny <k4sbz.stan@gmail.com>; Date: Wed, 19 Aug 2015 15:29:49 -0400; Frank, It increases with power. Gets really bad when I kick in the linear. No. Only whats available on the internet. An email to the manufacturer, USI Electric Inc., went unanswered. When I disabled; /archives//html/RFI/2015-08/msg00069.html (9,541 bytes)
16. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Stanley Zawrotny <k4sbz.stan@gmail.com>; Date: Thu, 20 Aug 2015 11:52:56 -0400; All, Thanks, to everyone who contributed to this thread. There was a lot of expert advice given and at least one or two seemed viable. I haven't had a chance to implement any of them yet due to time; /archives//html/RFI/2015-08/msg00070.html (8,265 bytes)
17. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 20 Aug 2015 20:42:12 -0700; Does the interference to the smoke detectors occur at very low RF output...say 5 or 10 watts? Or does it occur only AT higher output levels. It increases with power. Gets really bad when I kick in t; /archives//html/RFI/2015-08/msg00071.html (11,203 bytes)
18. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Greg Troxel <gdt@lexort.com>; Date: Fri, 21 Aug 2015 11:31:30 -0400; Have you tested/evaluated the RadioWorks T-4G+ line isolator, or the similar things from MFJ? I know you recommend many turns around specific mixes, but I'm curious what the shield impedance is on th; /archives//html/RFI/2015-08/msg00073.html (9,122 bytes)
19. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Stanley Zawrotny <k4sbz.stan@gmail.com>; Date: Fri, 21 Aug 2015 13:42:35 -0400; We were our own general contractor building the house. We had some "work quality issues" with the electrical contractor that installed the smoke detectors. That was three years ago. I don't think an; /archives//html/RFI/2015-08/msg00074.html (8,833 bytes)
20. Re: [RFI] RFI With Smoke Detectors (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Fri, 21 Aug 2015 11:21:27 -0700; No. Looking at the photo and lack of specs, I wouldn't expect them to work very well. I know you recommend many turns around specific mixes, but I'm curious what the shield impedance is on these. See; /archives//html/RFI/2015-08/msg00075.html (10,273 bytes)

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