[RFI] LED lighting

[Hare, Ed W1RFI]

Actually, we don't.  We have the screen room to do receiver and transmitter testing, and a room set up in compliance with ANSI C63.4 to do conducted-emission measurements, but not an anechoic chamber. Outdoor testing should suffice, being a good approximation to a calibrated open-area test site.  If we find devices a few dB above the limits, we don't file complaints, but the things we have found to be bad have been WAY above the limits, so close enough is close enough.


Ed Hare, W1RFI
ARRL Laboratory Manager
225 Main St.
Newington, CT 06111
Tel: (860) 594-0318
Fax: (860) 594-0259
Email: W1RFI at arrl.org
Member: IEEE Connecticut Section
Member: IEEE EMC Society, Board of Directors
Member: IEEE EMC Society Standards Development and Education Committee
Primary representative:  ANSI ASC C63 EMC Committee, Vice Chair Subcommittee 5 (Immunity)
Member: QRP Amateur Radio Club International, Board of Directors



From: David Robbins [mailto:k1ttt at verizon.net]
Sent: Monday, July 27, 2015 11:19 AM
To: Hare, Ed W1RFI
Cc: rfi at contesting.com
Subject: Re: Re: [RFI] LED lighting

what?  you don't have an anechoic shielded chamber to do that kind of stuff???


Jul 27, 2015 11:05:16 AM, w1rfi at arrl.org<mailto:w1rfi at arrl.org> wrote:
I bought one multi-LED bulb that came from China. It was dead quiet. My guess is that it simply put the LEDs in series and connected them to the line. Not all of them will have a switcher in them.

ARRL tested a number and found them to be below the conducted emissions limits. I want to test them above 30 MHz too, for radiated emissions, though we'd need to set up outdoors to prevent scatters from throwing off the readings.


Ed Hare, W1RFI
ARRL Laboratory Manager
225 Main St.
Newington, CT 06111
Tel: (860) 594-0318
Fax: (860) 594-0259
Email: W1RFI at arrl.org<mailto:W1RFI at arrl.org>
Member: IEEE Connecticut Section
Member: IEEE EMC Society, Board of Directors
Member: IEEE EMC Society Standards Development and Education Committee
Primary representative: ANSI ASC C63 EMC Committee, Vice Chair Subcommittee 5 (Immunity)
Member: QRP Amateur Radio Club International, Board of Directors



-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of David Robbins
Sent: Sunday, July 26, 2015 11:37 AM
To: 'Phil Snyder'; rfi at contesting.com<mailto:rfi at contesting.com>
Subject: Re: [RFI] LED lighting

They could just be led bulbs in a standard 120v socket also... in those there is a switching supply in the base of each bulb.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net


-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Phil Snyder
Sent: Sunday, July 26, 2015 14:51
To: rfi at contesting.com<mailto:rfi at contesting.com>
Subject: [RFI] LED lighting

Well after a 4 year period the local electric company found the offending lightning arrester and voila no more noise! Unfortunately, the neighbor behind me just remodeled the outside of their house and in the process added about 6 LED lighting fixtures in the soffit across the front and after a few days of watching and listening it appears that they are causing way more RFI then the faulty arrester ever did.

I am hoping to learn a little more here before approaching them to make sure all my facts are straight. I am assuming that there is a switching power supply running the lights and that the power is cut to the supply when they are not on since the noise is gone when they are off. Is it possible to try and suppress the noise on the leads coming out of the power supply? Does he need to contact the manufacturer to replace the supply? Unfortunately they are mounted into the soffit like a can type light you would have inside your house and I hope the power supply is accessible.

Thanks
Phil
N9LAH
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