Topband: Grounds

Jim Brown jim at
Sun Mar 2 00:10:38 EST 2014

On 3/1/2014 8:25 PM, Mike Waters wrote:
> I even hung some #31 cores on the lamps themselves
> (which helped a little) and on the Romex feeding the fixture.

I don't have a good handle on RFI from fluorescents, but there are (at 
least) two mechanisms. One is radiation from the lamps themselves, and 
that can be reduced by shielding (a screen that makes a good connection 
to a mechanical reflector/enclosure, if there is one. The other is trash 
generated by the ballast ("modern ones, I believe, have the same issues 
as switching power supplies, and the trash is radiated by the AC wiring.

The RFI reflector might be a good resource for more.

73, Jim K9YC

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