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Re: Topband: Home Depot LED bulb interference.

To: Charles Moizeau <w2sh@msn.com>
Subject: Re: Topband: Home Depot LED bulb interference.
From: DAVID CUTHBERT <telegrapher9@gmail.com>
Date: Fri, 6 Apr 2012 06:45:16 -0600
List-post: <topband@contesting.com">mailto:topband@contesting.com>
LED lighting has the potential to become the main MF/HF noise source for
us.

FCC *radiated noise* limit testing can produce much lower measured levels
than some consumer installations.

The driver for consumer installations is *conducted noise*. For LED
lighting this should be almost all differential-mode and that is not a huge
problem until there is differential-mode to common-mode conversion in AC
wiring asymmetries. If the 1 mV FCC conducted EMI limit (1.6 to 30 MHz) is
reached with a common-mode a signal, a signal of 20 dB over S-9 can be
induced into a 1.8 MHz dipole 50 feet away. Imagine dozens of these LED
lamps nearby and in your own house.

     Dave WX7G
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