[RFI] LED Bulbs

Mike Ryan mryan001 at tampabay.rr.com
Mon Feb 10 14:36:19 EST 2014

Sorry Jim but the power supplies that these lights are connected to are not 
always the case. I mentioned in an earlier post here about some 50w LED 
lamps which use 12 vot AC, that's AC. The power supply is clean.  The BULBS 
have switching power supplies of some nature in them.  LOEWS has a line of 
exterior landscaping lights which will pretty much drive you QRT.  My 
neighbor has 10 of these in his yard.  They are dirty from HF to at least 
440mhz.  When his outdoor lights timer goes ON, I am OFF. I'd be happy to 
post info on these again should someone care.  - Mike

-----Original Message----- 
From: David C. Hallam
Sent: Monday, February 10, 2014 1:48 PM
To: rfi at contesting.com
Subject: Re: [RFI] LED Bulbs

I may have made an unwarranted conclusion, but I assumed the LED were
substituted for halogen without any other changes.  I will see if I can
get a clarification on that point.  Would a change in bulb types make
any difference in the RFI being generated?


On 2/10/2014 1:14 PM, Jim Brown wrote:
> On 2/10/2014 11:07 AM, Dave Cole wrote:
>> Who would have thought the LED's could radiate so far?
> It's not the LEDs, it's the wires (antennas) connected to the switching 
> power supply for the LEDs. This should come as no surprise to any ham --  
> switching power supplies are generators of RF trash, that puts RF current 
> on those wires, and like any other antenna, those wires radiate the trash.
> Thank you VERY much for posting details of part numbers and vendors for 
> the bad products.
> 73, Jim K9YC
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