[RFI] Smoke-alarm Interference - not TVI but SAI

[dalej]

I had similar issues with a carbon monoxide detectors, the kind that plug into a wall socket made by a well known detector company.  They'd go off when I used my amp.  I switched to battery powered same detector and have not had anymore problems.  The wiring inside the house is an antenna for the hard wired or plug into wall socket type detectors.  All my smoke detectors are also battery powered.

73
Dale, k9vuj


On 22, Oct 2014, at 9:47, "Mike Ryan" <mryan001 at tampabay.rr.com> wrote:

> I don't know anything about your issue with the smoke alarms but just after I moved to Florida and set up my station, I began getting into my next door neighbor's alarm when it was turned on.  ANY amount of HF rf would set it off.  I discussed this with a friend lives in Virginia where I had just moved from. We did a few tests and it appeared that the problem could be solved by putting bypass caps at the ends of the leads to the KEY PADS located just inside the front door, inside the laundry room off the garage, and on the master control box leads to the sensors.  This worked and I have never had a problem since.  If the issue is with some kind of a wireless system, the results may vary or the fix might not work at all. But it did here.  '73, -Mike
> 
> -----Original Message----- From: Kenneth G. Gordon
> Sent: Monday, October 20, 2014 8:35 PM
> To: RFI at contesting.com
> Subject: [RFI] Smoke-alarm Interference - not TVI but SAI
> 
> OK, Folks, I can use some help here, not for me, personally, but for some
> fellows on another forum (600 Meter Research Group) who are having
> problems getting into hard-wired smoke-alarms.
> 
> Their frequency of operation is at or near 500 KHz. One fellow is setting off
> his own smoke-alarms, and another fellow is getting into a particularly
> difficult neighbor's alarms.
> 
> The second fellow's neighbors called the FCC and complained to them. The
> FCC contacted the ham, and when they were told what and how he was
> operating, they told the neighbors to go to Radio Shack and buy some
> filters....which didn't particularly satisfy the neighbors.
> 
> Anyway, might you people have some suggestions as to solutions for this
> problem? What sorts of filters would work to keep from setting off the
> smoke-alarms? The only really effective one I can think of is an ax...
> 
> (Why must we be constantly plagued by this sort of crap, anyway?)
> 
> Thanks,
> 
> Ken Gordon W7EKB
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