RFI
[Top] [All Lists]

Re: [RFI] LED lighting

To: rfi@contesting.com
Subject: Re: [RFI] LED lighting
From: David Cole <dave@nk7z.net>
Reply-to: dave@nk7z.net
Date: Mon, 27 Jul 2015 12:59:06 -0700
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
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
> 
> _______________________________________________
> 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

_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi

<Prev in Thread] Current Thread [Next in Thread>