Also those hand sized general purpose timers can also throw out a lot of RFI
as well!!!
Even the ones that are 'ok' when you first buy them seem to start getting
noisy after a few months
Learned the hard way, sorry didn't save the info but were all stuff bought at
either HomeDepot, Lowes or drug store chain....
I presume everything I buy is a RFI pig and try to test it on the bench , and
be sure I save receipts ....
n2ehg
On Feb 10, 2014, at 4:19 PM, Mike Ryan <mryan001@tampabay.rr.com> wrote:
> Ed, I never would have thought of a timer causing such an issue but the timer
> is built into this power supply...we have all seen these in the Home
> stores...they are used for exterior lighting. The power supply running in
> the garage during the day is quiet. But when you can turn the noise ON or OFF
> by CHANGING THE CLOCK timer to the ON position and activating the lights, you
> know you are on to something. - M
>
> -----Original Message----- From: EDWARDS, EDDIE J
> Sent: Monday, February 10, 2014 2:57 PM
> To: 'Mike Ryan' ; rfi@contesting.com
> Subject: RE: [RFI] LED Bulbs
>
> "When his outdoor lights timer goes ON, I am OFF."
>
> Just FYI. Automatic light timers can also generate noise all by themselves.
> We had one my wife bought for our Christmas lights that made noise all over
> the HF bands.
>
> 73, de ed -K0iL
>
> -----Original Message-----
> From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Mike Ryan
> Sent: Monday, February 10, 2014 1:36 PM
> To: rfi@contesting.com
> Subject: Re: [RFI] LED Bulbs
>
> 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@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?
>
> David
> KW4DH
>
> 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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>
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