Posted by Punjab The Sailor Man on August 25, 2007, 2:26 pm
Zyp wrote:
> davidj92 wrote:
>> McWideGlide wrote:
>> snip
>>> I wonder if a magnet of that strength would set a good nail up for
>>> the rear tire?
>> That's definitely possible.
>> I screwed up when I jumped in this thread and missed the original post
>> selling magnets. I'm not endorsing the magnet gizmo in any way and
>> when I tried to check out the magnet on the link in the post it tried
>> to do some crazy stuff to my puter. My spam blocker kicked in, my
>> pop-up blocker kicked in and an install gizmo tried to kick in
>> causing my anti-virus blocker to kick in.
>> If you've got a couple old speakers with a magnet of any size it
>> could help detection without being strong enough to pull junk under
>> your bike. Dave
>
> The problem is an old one. Some road inductor(s) sensors pick up bikes and
> some don't. The iron mass is what make the inductance change. I don't
> think a magnet [unless is contains a considerable amount of mass] helps
> much. I've heard from some riders who use their side stand. The flip it
> out over the inductor loop in the street and claim it helps. I don't know.
> I know that if I come across a traffic light that doesn't respond in a
> resonable amount of time [the law states 2 minutes] then I can presume the
> signal is broke and go about my business.
>
What about that white strobe in the middle of the new red lights? Is
that scanning for traffic?
Posted by Outback Jon on August 25, 2007, 2:56 pm
Punjab The Sailor Man wrote:
> What about that white strobe in the middle of the new red lights? Is
> that scanning for traffic?
Nope, that's just to bring attention to the fact that the light is RED.
Around here (upstate NY), you see them mostly in rural traffic lights.
It's merely a xenon strobe bulb across the red lens. Or a strip of
bright LEDs. (On the newer LED replacement traffic lights)
--
"Outback" Jon - KC2BNE
outback_jon@ver.no.sp.am.izon.net
AMD Opteron 146 (@2.8) and 6.1 GHz of other AMD power...
http://folding.stanford.edu - got folding? Team 48435
2006 ZG1000A Concours "Blueline" COG# 7385 CDA# 0157
1980 CB750F SuperSport "CoolerKing"
Posted by Carl on August 20, 2007, 8:29 pm
Just for the hell of it I did a search on the subject, how does a traffic
light work?
http://www.howstuffworks.com/question234.htm
--
Carl
I started out with nothing and
I just about have that paid for.
Remove one 9 to reply
--
Posted via a free Usenet account from http://www.teranews.com
Posted by Fred W on August 21, 2007, 3:03 pm
Carl wrote:
> Just for the hell of it I did a search on the subject, how does a traffic
> light work?
>
> http://www.howstuffworks.com/question234.htm
Which led me to this page:
http://www.signalsorcerer.com/get_a_green_light.html
--
-Fred W
Posted by davidj92 on August 21, 2007, 5:15 pm
Fred W wrote:
> Carl wrote:
>> Just for the hell of it I did a search on the subject, how does a
>> traffic light work?
>>
>> http://www.howstuffworks.com/question234.htm
> Which led me to this page:
> http://www.signalsorcerer.com/get_a_green_light.html
Both are partially correct, although the last link is trying to sell
something that's why they focus on metal. A factor they mention in the
howstuffworks site is the core of an inductor. The indunctance of the loop
can change if a core with enough significance comes over the loops
electromagnetic field. That's another factor and consideration that shows
the mass moving over the loop does not have to be magnetic.
A better simple explanation is here
http://en.wikipedia.org/wiki/Indicator_loop
and here
http://www.motivation-tc.co.uk/loop.htm
Note the metion of the sensitivity and frequency setting of the detector.
When we installed loops we used a coil of copper wire on a plywood board,
that matched certain perimeters needed for the loop size and shape, to test
the loops reaction before we covered it with asphalt or rubber. We had
different sizes for different size loops. On a low reacting loop we'd drive
a vehicle on top of it to check the loops operation before sealing in the
roadway.
Dave
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>> McWideGlide wrote:
>> snip
>>> I wonder if a magnet of that strength would set a good nail up for
>>> the rear tire?
>> That's definitely possible.
>> I screwed up when I jumped in this thread and missed the original post
>> selling magnets. I'm not endorsing the magnet gizmo in any way and
>> when I tried to check out the magnet on the link in the post it tried
>> to do some crazy stuff to my puter. My spam blocker kicked in, my
>> pop-up blocker kicked in and an install gizmo tried to kick in
>> causing my anti-virus blocker to kick in.
>> If you've got a couple old speakers with a magnet of any size it
>> could help detection without being strong enough to pull junk under
>> your bike. Dave
>
> The problem is an old one. Some road inductor(s) sensors pick up bikes and
> some don't. The iron mass is what make the inductance change. I don't
> think a magnet [unless is contains a considerable amount of mass] helps
> much. I've heard from some riders who use their side stand. The flip it
> out over the inductor loop in the street and claim it helps. I don't know.
> I know that if I come across a traffic light that doesn't respond in a
> resonable amount of time [the law states 2 minutes] then I can presume the
> signal is broke and go about my business.
>