From: John Tserkezis 
Reply-To: Fidonet AVtech Echo 

Bob Lawrence wrote:

> JT> Dunno what environment (or range) Brenton needs.

>>Outdoors... 20m. 

> JT> Can it be focussed? Or is it a hand-held device that needs to
> JT> be portable? 

>  Both. It can be focussed, and battery-powered. Well-focussed LEDs
> are readily available. I tried a bigger lens on the transmiter, but
> the gain was negligible. The big gain with a lens comes on the
> receiver.

  Thought about techniques to improve the signal to noise ratio?  Being 
outdoors isn't a good start with IR.

  Is RF a suitable alternative?  Some UHF car alarm keys go for that sort of 
distance easily.  Not directional and quite low power consumption.

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