Fortunately very few street lights around here, but the ones that are around
are metal arms bolted to wood poles.
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 David Cole
Sent: Monday, July 27, 2015 19:59
To: rfi@contesting.com
Subject: Re: [RFI] LED lighting
Just to make it worse Ed...
I am seeing fiberglass power poles coming into use for street lights...
No more shielding...
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
For MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
For Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
For MM-SSTV see:
http://groups.yahoo.com/neo/groups/MM-SSTV/info
On Mon, 2015-07-27 at 17:49 +0000, Hare, Ed W1RFI wrote:
> We have tried to take the issue of LED traffic lights to the FCC.
>
> Based on the reported signal levels, it is very likely that they meet the
FCC emissions limits for conducted emissions below 30 MHz and radiated
emissions above 30 MHz. This would leave the issue as one of harmful
interference.
>
> In the LED lights I have looked at, it is almost certain that the noises,
at least on HF, are being conducted differentially onto the 240 volt wiring
powering the bulbs. This decays very rapidly with distance in the
near-field region, so noise that is pretty strong right at the bulb is not
very strong at all a couple of hundred feet away. The FCC has stated pretty
clearly that under those circumstances, it does not consider the short-term
interference to a mobile station to be harmful interference. In my own
experience, I believe I could go to a neighborhood and find a place to
operate, just not within 100 feet of the bulbs. Is that harmful
interference, or not? So far, I'd have a hard time imagining convincing the
FCC that it is.
>
> Now, if there were a fixed station right at the light, and that does
happen, there could be harmful interference. So far, ARRL has not had
reports of interference from LED traffic lights to fixed stations.
>
> I will continue to concentrate on some of the other problems, as Dave
says, picking our fights wisely. Grow lights 40 dB over the limits and an
FCC that won't enforce even its own Citation and Orders are a first priority
right now. Pulse-wide control motors are also a growing problem, as are
certain lighting devices being sold into residential markets, even though
they don't meet the residential limits.
>
> 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 Cole
> Sent: Monday, July 27, 2015 1:38 PM
> To: rfi@contesting.com
> Subject: Re: [RFI] LED lighting
>
> Hi Cortland,
>
> I have noticed that, but, like the ARRL we are picking our fights...
> Going for the items that affect the most hams in the area first.
> --
> Thanks and 73's,
> For equipment, and software setups and reviews see:
> www.nk7z.net
>
> For MixW support see;
> http://groups.yahoo.com/neo/groups/mixw/info
> For Dopplergram information see:
> http://groups.yahoo.com/neo/groups/dopplergram/info
> For MM-SSTV see:
> http://groups.yahoo.com/neo/groups/MM-SSTV/info
>
>
> On Mon, 2015-07-27 at 13:11 -0400, CR wrote:
> > On 7/27/2015 12:55 PM, David Cole wrote:
> > > 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
> >
> > LED stop lights, however, have been known interferers for some time,
> > probably due to noisy SMPS and long lines to the timers and
controllers.
> >
> >
> > Cortland Richmond
> > KA5S
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
>
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