[RFI] Touch Lamps

Ed -K0iL eedwards at tconl.com
Tue Apr 25 18:37:05 EDT 2006

That bandwidth sounds a little large for typical Taiwan non-UL listed touch
lamps, so maybe it's something else.  I have found most lamps to be around
40-50Khz wide every 170-180Khz (oscillator freq).  

One thing I noted while hunting down and cleaning up several
touch-controlled lamps was the fact that the freq of the strongest signal
depended on which part of the house or which circuit the lamp was plugged in
to.  I found one outlet in my house where the noisiest lamp was totally

The fun thing about touch lamps with 3-way bulbs that are close enough to
you is when you can control them with your HF signal.  I was able to
convince one neighbor to sell his at a garage sale and I never had to even
speak to him about it! ;-)  They just got tired of it going on & off in the
middle of the night.  I could tell I was switching it because the freq of
the bandwidth shifted up each time I transmitted on CW.  Three time up, then
back down again on the 4th time (off).  They were new neighbors and didn't
know I was a ham or what the antennas did.  

73, de ed -K0iL

-----Original Message-----
> Any touch lamp gurus out there ? I tracked one down last summer that ran
> the 7100 - 7200 KHz range , but now I have one next door that sounds very 
> very much the same but tends to sweep in the 3560 - 3750 KHz
> are extremely strong on 40 and 20 meters as well. (No the other one was
> also running at half of 7100 )  The neighbors swear they have no touch
> . What I wonder is - at what frequencies have others seen touch lamps 
> radiating  ???
> Thanks  - Hank K7HP 

No gurus here but thought I'd share what I have
been told by some who are.

Could be any number of sources, not just touch lamps.

New washer, dirty dimmer, new light fixture or
florescent bulb replacement for an incandescent,

There are bazillions of new RF-dirty devices out
there these days.

Best solution is to move where they are not within a
few hundred feet of your home ... preferably a few

Thanks! & 73, doc kd4e   bibleseven.com

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