Hi Ed,
I discovered that the City here is going to be switching to LED
streetlights soon, and ended up in contact with the City Engineer...
The long and short of it is that the city had not even thought about
Part 15/18 compliance, but when they looked, the lights were compliant
as per the data sheet on them.
He and agreed to have us look over the test run they have in place
looking for RFI... He gave us the addresses and we we did-- all of them
were dead quiet on 80-10 Meters, regarding broadband noise, in a drive
around test...
We did a prelight drive around, mapping all the poles by number and
taking RF background readings, on 80-10, then waited for them to light,
and did it again... Not one light made any detectable RFI, at street
level. Not scientific, and I told him that, but at least the city is
being really good about RFI, and it is now on their radar.
--
Thanks and 73's,
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On Mon, 2015-07-27 at 15:04 +0000, Hare, Ed W1RFI 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@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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