Re: [vcf-midatlantic] OT: LED lights
On 03/10/2016 01:09 PM, Bill Sudbrink via vcf-midatlantic wrote:
Dave McGuire wrote:
No, not at all. Weak signals from other continents are often completely obliterated by interference from LED, CFL, and standard fluorescent lighting. The inverse squares law applies to the desired transmissions too, and they're coming from a lot farther away that across the street.
Two words:
Faraday cage
Then we could get Tempest certified too ;-)
YES!! -- Dave McGuire, AK4HZ New Kensington, PA
Granted, but is it worse than the awful RF noise from florescent ballasts? On Thu, Mar 10, 2016 at 2:30 PM, Dave McGuire via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
On 03/10/2016 01:09 PM, Bill Sudbrink via vcf-midatlantic wrote:
Dave McGuire wrote:
No, not at all. Weak signals from other continents are often completely obliterated by interference from LED, CFL, and standard fluorescent lighting. The inverse squares law applies to the desired transmissions too, and they're coming from a lot farther away that across the street.
Two words:
Faraday cage
Then we could get Tempest certified too ;-)
YES!!
-- Dave McGuire, AK4HZ New Kensington, PA
Most of the time it is, yes. The magnetic ballasts generate a little bit of harmonic interference, but the "electronic" ones are far worse, since their switching times are much faster. The magnetic ones are the reason I don't operate on HF much these days. (aside from that whole lack-of-spare-time thing) There are ~380 eight-foot fluorescent light bulbs in the building. :-( -Dave On 03/10/2016 02:37 PM, Dean Notarnicola via vcf-midatlantic wrote:
Granted, but is it worse than the awful RF noise from florescent ballasts?
On Thu, Mar 10, 2016 at 2:30 PM, Dave McGuire via vcf-midatlantic < vcf-midatlantic@lists.vintagecomputerfederation.org> wrote:
On 03/10/2016 01:09 PM, Bill Sudbrink via vcf-midatlantic wrote:
Dave McGuire wrote:
No, not at all. Weak signals from other continents are often completely obliterated by interference from LED, CFL, and standard fluorescent lighting. The inverse squares law applies to the desired transmissions too, and they're coming from a lot farther away that across the street.
Two words:
Faraday cage
Then we could get Tempest certified too ;-)
YES!!
-- Dave McGuire, AK4HZ New Kensington, PA
-- Dave McGuire, AK4HZ New Kensington, PA
On 03/10/2016 02:30 PM, Dave McGuire via vcf-midatlantic wrote:
On 03/10/2016 01:09 PM, Bill Sudbrink via vcf-midatlantic wrote:
Dave McGuire wrote:
No, not at all. Weak signals from other continents are often completely obliterated by interference from LED, CFL, and standard fluorescent lighting. The inverse squares law applies to the desired transmissions too, and they're coming from a lot farther away that across the street.
Two words:
Faraday cage
Then we could get Tempest certified too ;-)
YES!!
For the Radio Club? Okay but that kind of defeats the point of a radio. ;-) -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies
On 03/10/2016 02:46 PM, Neil Cherry wrote:
No, not at all. Weak signals from other continents are often completely obliterated by interference from LED, CFL, and standard fluorescent lighting. The inverse squares law applies to the desired transmissions too, and they're coming from a lot farther away that across the street.
Two words:
Faraday cage
Then we could get Tempest certified too ;-)
YES!!
For the Radio Club? Okay but that kind of defeats the point of a radio.
;-)
Antennas should be outdoors. ;) -Dave -- Dave McGuire, AK4HZ New Kensington, PA
On 03/10/2016 03:30 PM, Dave McGuire via vcf-midatlantic wrote:
Antennas should be outdoors. ;)
Hey it's bad enough my Dad has me doing all sorts of yoga poses to get in WHYY. I'm not standing outside too! ;-) Hope that retro enough for some folks. ;-) -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies
My experience with LED lamps for motorcycle use is that the driver generates RF interference that wipes out fringe FM reception on the motorcycle. Down here in Ocean County, pretty much everything but WOBM is fringe :-( LED drivers are high frequency switchers so they are all going to generate some RF. I would be tempted to ASK the radio guys if they can recommend LED lights that have low emissions. They are the experts, and it's "their problem" if our lights piss all over their radios. ALSO: My brother works for an LED lamp manufacturer. He says that the consumer grade Cree lamps are inexpensive because Cree has chosen to overdrive the LEDs, counting on the unlikeliness that people will take a 4 year old burned out LED light back to the store (or mail it back to Cree). In other words, Cree is gambling their good name to chase short term profits. Bill Dudley This email is free of malware because I run Linux.
On 03/10/2016 03:48 PM, William Dudley via vcf-midatlantic wrote:
ALSO: My brother works for an LED lamp manufacturer. He says that the consumer grade Cree lamps are inexpensive because Cree has chosen to overdrive the LEDs, counting on the unlikeliness that people will take a 4 year old burned out LED light back to the store (or mail it back to Cree). In other words, Cree is gambling their good name to chase short term profits.
Damn suits. -Dave -- Dave McGuire, AK4HZ New Kensington, PA
On 03/10/2016 03:48 PM, William Dudley via vcf-midatlantic wrote:
Cree is gambling their good name to chase short term profits.
Ouch! -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies
participants (4)
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Dave McGuire -
Dean Notarnicola -
Neil Cherry -
William Dudley