I did a search on the ARRL members section at HQ using touch lamp rfi and
found quite a bit of info on the subject. Several people cured the problem
by putting a resistor of 1k to 2k in series with the touch plate input. In
one case an rfc was in series with the resistor. The info said the lamp
contains a free runing oscillator which puts out a raspy signal. 73 and GL,
Dan, N5AR
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of K6QD
Sent: Friday, February 03, 2006 1:22 PM
To: amps@contesting.com
Subject: [Amps] RFI Question
I don't know if this is the correct forum for my question, so if not, I
apologize.
I have a friendly neighbor who has recently installed new light dimmer
controls on three lamps. I am causing his lamps to go on & off when running
any power over 100W on all HF bands. I had not seen this type of dimmer
before, but it is a small (2" x 2" x 3/4") plastic box with 4 leads exiting.
The 4 leads go to 1) 115 hot, 2) 115 neutral, 3) 115 to the lamp and 4)
control lead to the metallic base of the lamp. By momentarily touching the
lamp base one can set the brightness to 3 levels as well as off. Opening
the box, I find one IC (8-pin mini-dip), one TO-220 (appears to be a pass
transistor - nomenclature: "BT136", "600D") and multiple R, C & diodes on a
single-sided PCB. There is no reference to the manufacturer other than
"China". I can generally understand how the device works even though I
cannot reference what the IC is. The IC nomenclature is "DI-2417" &
"C4841917-6A". Has anyone had any experience correcting an interference
problem with one of these type de
vices? Thanks! Mike K6QD
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