[RFI] RFI to new photoelectric smoke detector

N1BUG paul at n1bug.com
Tue Nov 6 07:28:23 EST 2012

Were weather conditions different during the contest?

I had severe problems with RF from 160m knocking my DSL connection 
off-line until I installed a filter. Now it is fine except when it 
rains. The DSL signal margins and line attenuation are identical and 
wet and dry weather, so I can only guess somehow more RF finds its 
way to the system when things are wet. I realize your smoke detector 
isn't exposed to the weather, but your antennas and, I presume, a 
good deal of the "space" between them and the smoke detector is. 
Just a thought.

Paul N1BUG

On 11/06/2012 12:28 AM, Kelly Johnson wrote:
> Nothing was different AFAIK.  The only difference I can think of is
> that I removed the battery (during the contest) and put it back in
> today.
> Oh well.  It will probably come back at which point I can do more
> investigation (if not in the middle of a contest).  I'm just glad it
> wasn't a neighbor knocking on my door to complain of TVI.
> On Mon, Nov 5, 2012 at 8:47 PM, qrv at kd4e.com <qrv at kd4e.com> wrote:
>> What else did you have hooked up uniquely for the
>> contest?
>> Something that was connected then, and not now, was
>> coupling the signal into the detector wiring.
>>> Kelly Johnson wrote:
>>> I tried multiple bands and multiple beam headings today, in addition
>>> to trying 80m.  I couldn't make the smoke detector "chirp" today.  I
>>> have no idea why.  I assume it won't happen again until the next
>>> contest :-)

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