[Elecraft] Filtering RFI from LED & flouresence Dimmer Switches

[Phil Kane]

On 1/26/2016 12:59 PM, Bob McGraw K4TAX wrote:

> If you choose to use incandescent lamps in the garage door opener,
> choose the "heavy duty vibration resistant" bulbs.   These can also be
> found labeled as "ceiling fan" bulbs.  Seems that they have 3 or 4 wires
> supporting the filament as opposed to only two wires for the standard bulb.

They are also called "Rough Service" bulbs.  For years I thought that
that was "rough surface" from the bulb's coating.  No RFI from them AFAICT.

At home I use  a remote-controlled light dimmer for a table lamp.  It's
a double threat - the remote Part 15 and the dimmer electronics.  After
ruining one with an LED I RTFM that said "incandescent only".  I then
found a similar dimmer at a specialty lighting store that was certified
for LEDs.  It was also necessary to get a dimmable LED - not all are.  I
tried it out at the store to make sure that it would work together.

The upshot is that I cannot detect any RFI even though the lamp is in
the next room.  Of course, with the high HF noise level here, it may
just be masked.

73 de K2ASP - Phil Kane
Elecraft K2/100   s/n 5402

>From a Clearing in the Silicon Forest
Beaverton (Washington County) Oregon