On Jan 9, 2:50*am, Jeff Liebermann wrote:
On Mon, 09 Jan 2012 00:01:58 -0500, micky
wrote:
Dramatic license.
I prefer poetic license:
http://www.LearnByDestroying.com/poetry/poetry.htm
If you're going to sell this script, it will need drama, suspense,
action, intrigue, politics, explosions, violence, a chase scene, sex,
and display the advertisers products. *However, the one thing that
must never appear in the script is something that requires the viewer
to think. *If there's even the slightest hint of "how does that
work?", the script won't sell. *Science fiction and defective physics
are perfectly acceptable, as long as the actors all pretend that it's
real, and that nobody in the story questions the technology. *To many
people, microprocessor controlled parking lot lights, triggered by
sophisticated PIR detectors, are more like magic than science.
I forgot to mention that the lights were all LED lights and VERY
bright. *Something like this:
http://www.ledsmagazine.com/news/6/1/13
The real question is whether LED lights generate RF interference.
There's no consensus and plenty of opinions. *My experience has been
that some do, and some don't. *I have several consumer LED house
lights. *Only one belches RFI. *I haven't bothered to check which ones
are boost, buck, or both.
http://prudentrver.typepad.com/leds/2011/03/reasons-an-led-light-migh...
--
Jeff Liebermann * *
150 Felker St #D * *http://www.LearnByDestroying.com
Santa Cruz CA 95060http://802.11junk.com
Skype: JeffLiebermann * * AE6KS * *831-336-2558
I live in a small town in New Hampshire. About twenty years ago,
(before we got cable into town) I suddenly started to get numerous
calls from customers on one side of town complaining that TV channel 5
had just simply disappeared. My house was not affected and so this was
news to me. I visited one affected house and found a grey screen with
no audio. It appeared as though something was completely swamping the
entire channel. We contacted the FCC in Boston and what a waste of
time that was.
So I drove around town visiting different homes and asking if they
were also affected by this. Eventually I was able to draw a sort of
"lobe" of the pattern. The pattern was somewhat directional and the
radiating point appeared to be a communications tower set on private
property. The gentleman that owned the tower was very proud of it and
took me on a short tour of the facility. He would lease parts of this
tower to different commercial services. Among these services was a
radio data link to Massachusetts which operated on a frequency 200KHZ
below channel five's video carrier. While in the shack I noticed a
bandpass filter sitting on the shelf which was marked with his
operating frequency. I asked if that shouldn't have been in line with
the antenna and at that point the meeting became adversarial. I often
wondered if perhaps the filter was tuned incorrectly and it's
insertion into the line caused problems, so that was why he removed
it, or perhaps he was overmodulating, creating excessive sidebands
which poked into channel five. In any case I found it interesting
though that a few days after my visit the problem mysteriously
disappeared , never to return again.
When I was fifteen I built my first kit, an Eico CB radio. The
receiver was as wide as a barn door but it had an excellent
transmitter section. We lived in an apartment building in the Bronx
and most television sets of the day were built with 21MHZ IF strips.
So when I keyed that transmitter no one for blocks around was able to
watch channel two on their TV sets. I installed a low pass fiIter on
my rig and I lost track of how many high pass filters I installed for
my neighbors.
I would also think about your radio's IF frequency, although on second
thought that would not be limited to only certain channels.
I'd really like to know if you find this thing. Please keep us
informed. Lenny