An article found on the internet indicates that changing the AC power supply
to a DC supply will eliminate the RFI. Of course the polarity of the wiring
to the individual lamps must be corrected but it may be worth a try. -M
-----Original Message-----
From: Dale
Sent: Tuesday, March 12, 2013 12:16 PM
To: KD7JYK DM09 ; ka5s@earthlink.net ; rfi@contesting.com
Subject: Re: [RFI] Cree LED Bulbs?
Kurt,
This does amount to a serious scenario. If there is a switcher inside each
lamphead (Mike says he has sent as unit to a friend for analysis), then
there are 2 possible cures, neither of which is simple. The first would be
to fit all of the interconnecting power cables with ferrites as I described
in my post; the other would be to remove the LED "guts" from each head and
replace with halogen lamps, which can run direct from the 12 VAC. Alas,
these offending systems are not Mike's - they belong to his neighbor.
I suspect that applying the ferrite components would involve tearing up the
meighbor's yard near each lamp, and the halogen solution would require
removal of each lamp assembly for modification. Not good thoughts either
way. I don't think Mike has said how far these lamps are from his antennas.
So, NOTE TO MIKE: What is the approximate distance from these lamps to your
antennas?
If the lampheads do contain switchers, there should be some Part 15 notices
on the lamps themselves or, at the very least, on the system box or package.
If none exists, then maybe these devices have not been submitted as Part 15.
That might indeed be worth some degree of investigation. However, keep in
mind that Part 15 does NOT address radiated emissions below 26 MHz, so no
help with HF RFI.
73, Dale
WA9ENA
-----Original Message-----
From: KD7JYK DM09 <kd7jyk@earthlink.net>
Sent: Mar 11, 2013 11:57 PM
To: Dale <svetanoff@earthlink.net>, ka5s@earthlink.net, rfi@contesting.com
Subject: Re: [RFI] Cree LED Bulbs?
"bad news is that my "guess" about each lamp head containing a small
switcher might be correct. If it is, wow - what a mess!"
Well, that would be terrifying... Never even thought of such a thing.
Kurt
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