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'(OT)Traffic Lights (Was Car LED lighting etc ...)'
1999\08\02@233105 by Anne Ogborn

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> In Melbourne Australia a similar (or identical - I don't know) toll system is
installed by a Swedish company affiliated with SAAB aircraft industries. A radar
detector would probably detect those microwave trancievers; depending on it's f
requency reponce.
>

I don't know - the base xmitter is mounted right above the lane, pointed about 3
0 deg off vertical
"into the driver's eyes".

I suspect it's not very powerful, and probably is very directive.
Just from looking at the thing, it's obviusly some cm band microwave.

The transponder has a piezo unit and emits a small chirp when it's
fired off.
I'm curious what powers the chirp.

--
Anniepoo
Need loco motors?
http://www.idiom.com/~anniepoo/depot/motors.html

1999\08\03@014046 by Dennis Plunkett

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At 20:28 2/08/99 -0700, you wrote:
>> In Melbourne Australia a similar (or identical - I don't know) toll
system is installed by a Swedish company affiliated with SAAB aircraft
industries. A radar detector would probably detect those microwave
trancievers; depending on it's frequency reponce.
>>
>
>I don't know - the base xmitter is mounted right above the lane, pointed
about 30 deg off vertical
>"into the driver's eyes".
>
>I suspect it's not very powerful, and probably is very directive.
>Just from looking at the thing, it's obviusly some cm band microwave.
>
>The transponder has a piezo unit and emits a small chirp when it's
>fired off.
>I'm curious what powers the chirp.
>
A lithium battery!

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