Thanks everyone.

I have found an IR beam for monitoring a boundry in a security system.  One
of those things that when you break the beam it closes a realy.  Its good
for 200' outdoor (300 indoor).  There is nothing special about the parts,
but there is a nice convel lens setup at each end.  I can buy and use these
because that are$100 each pair and they only go one way, so for one duplex
link it would be $200.  Not good.  I have found some IR LED's and Photo
Transistors that a a couple of buckes each.  now I just need to get them to
reach one another from 200 feet.

        Any comments on lens sources?

Shawn


-----Original Message-----
From: Roman Black [mailto:fastvid@EZY.NET.AU]
Sent: Friday, June 22, 2001 9:59 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: Lasers and IR


Graeme Zimmer wrote:
>
> > We have remote testers at our shop, I have seen normal
> > TV remotes with one IR led at 30mA good for about 50 feet,
> > I assume if you use more power and a few IR leds and a
> > parabolic reflector (torch?) you can get a few times
> > this distance.
>
> How about Cloud Bounce Broadcasting?
>
> There are a number of guys getting city-wide coverage using a panel of
> infrared LEDs...
>
> for example see
http://www.qsl.net/w1vlf/techinfo/optical_transmitters.html



Now that is cool! An IR remote with over 4 miles
range...
-Roman

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