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[RFI] Lutron Dimmer RFI

To: rfi@contesting.com
Subject: [RFI] Lutron Dimmer RFI
From: Dennis Monticelli <dennis.monticelli@gmail.com>
Date: Wed, 18 Dec 2019 21:12:36 -0800
List-post: <mailto:rfi@contesting.com>

Excellent report.  Thank you very much for doing the measurements and
writing up the report.  Very useful to the group.

I had a similar experience with a Lutron (model CL) dimmer I recently
bought.  I tried it with both incandescent and LED lamps (a Philips LED
that was rated for dimmer use).  I had very similar results to yours in
using a portable shortwave radio to qualitatively judge the RFI.  The LED
was worse than the incandescent but both were problematic at BCB and 160M.
I also observed the highest RFI at 50% setting.  When a SMPS is chopped at
the line rate the poor PWM circuit is forced to go through its startup and
shutdown sequences repeatedly.  Adding a CM choke of any size at the dimmer
itself is a chore because the electrical box is too small to accommodate
it.  There would need to be some sheet-rock removed and the choke installed
in a second NEC box.  The lamps the dimmer would be driving are overhead
embedded in a soffit.  I would rather not deal with that either.

Given that the antennas are very close to the house there will be no
dimmers at this QTH.

Dennis AE6C
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