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@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@contesting.com] On Behalf Of David Robbins
Sent: Sunday, July 26, 2015 11:37 AM
To: 'Phil Snyder'; rfi@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@arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Phil Snyder
Sent: Sunday, July 26, 2015 14:51
To: rfi@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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