Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!wuarchive!csus.edu!ucdavis!csusac!sactoh0!jre
From: jre@sactoh0.sac.ca.us (Jim Earl)
Newsgroups: sci.electronics
Subject: Re: IR receiver on traffic lights ?
Message-ID: <1991Apr13.021948.29501@sactoh0.sac.ca.us>
Date: 13 Apr 91 02:19:48 GMT
References: <1991Apr12.042157.6685@engage.enet.dec.com> <1991Apr12.063837.7120@bradley.bradley.edu>
Distribution: na
Organization: Sacramento Public Access Unix, Sacramento, Ca.
Lines: 14

In my town, there are devices mounted on the traffic signals that
contain a sensor that picks up the rapid white flashing
hi-intensity strobe lights that are mounted on the local fire
trucks.  They work from up to a 1/2 mile away, even during the
daytime.  The flashing has to be a specific frequency (very fast, I
don't know the exact frequency, probably around 5 flashes per
second), and of course, very bright.  The fire chief is a buddy of
mine, that is how I know.
 
-- 
Jim Earl - KB6KCP / home: (916) 729-6825 work: (916) 929-0300 x233
INTERNET: jre@sactoh0.SAC.CA.US
UUCP: {ames | apple | att | sun}!pacbell!sactoh0!jre
  or: ucbvax!csusac!sactoh0!jre