On Fri, 28 Oct 2005, Spehro Pefhany wrote:

> You could try a bit of frosted or pebbled clear plastic. A Fresnel
> lens out of a duff motion detector etc. How about scuffing up a bit of
> clear sticky tape with emery paper and sticking it over the receiver?

That is not a good idea imho. You want to widen the field of view 
without losing energy if possible. A divergent lens added outside 
(tacked on) should help, but it will reduce the range.

Peter
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