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
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
--
"I predict future happiness for Americans if they can prevent the government
from wasting the labors of the people under the pretense of taking care of
them."
Thomas Jefferson
---
This email is free from viruses and malware because avast! Antivirus
protection is active.
http://www.avast.com
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
----------------------------------------------------------------------
This e-mail contains Omaha Public Power District's confidential and
proprietary information and is for use only by the intended recipient.
Unless explicitly stated otherwise, this e-mail is not a contract offer,
amendment, or acceptance. If you are not the intended recipient you are
notified that disclosing, copying, distributing or taking any action in
reliance on the contents of this information is strictly prohibited.
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|