[Laser] Results form a crude signal to noise versus frequency check on my optical receiver

[Buchanan Bill]

and might I add fit nicely in PVC couplers for I think
it is 3" pvc.....

one can lodge them in place with a short or long piece
of pvc for a front stray light filter....and of course
another piece to the rear for mounting the
reciever....I use black cardboard on the
inside......to reduce reflections...



--- Peter G3PHO <microwaves at blueyonder.co.uk> wrote:

> Zack Widup wrote:
> 
> > 
> > Anyone have a source for 4" lenses?  I've had a
> hard time finding 
> > something that size.  3" lenses abound but I'd
> like something bigger at a 
> > reasonable cost.
> 
> 
> Over here in the UK there are loads of cheap ($3)
> 100mm (=4") hand 
> lenses made in Far Eastern sweat shops! Most of the
> hardware shops and 
> markets have them. They can easily be removed from
> their plastic frame 
> and holder.
> 
> Peter, G3PHO
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> Laser at mailman.qth.net
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> 


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