[Laser] Tx lens diameter.

[stjohn at ocsnet.net]

Why not nine or sixteen retroreflectors, all on a portable plywood board?  Each
one reflects, and all back to the emitting source.

Anyone do this?

Tom Upton  AD6N

Kerry Banke wrote:

> Just  a note on using beam expanders.  One setup I use has  a laser pointer
> expanded out to 50mm.  I have what I would call  a very good pointing setup
> with  fine micrometer adjustment and have found that for LOS it's about as
> tight of a beam as practical for my setup.  Even with a 24X scope It takes
> a little time to  to hit a 2" retroreflector at 4 miles using a very slight
> manual raster scan.  Maybe the bigger issue is that a change in temperature
> in direct sunlight causes the beam to walk off the target.
> Kerry N6IZW -
>
> At 12:14 PM 6/16/2004 -0400, you wrote:
> >Richard,
> >
> >Keep in mind that you'll need to test your expander using a very distant
> >target.  A perfectly collimated beam should have a diameter of 6" right in
> >fron the of the transmitter, and 6" a mile away.  I used a white factory
> >building 3/4mi away and a 20x spotting scope to make my adjustments.  Keep
> >in mind that aiming something like this on a LOS path will be pretty much
> >impossible.
> >
> >I hope that helps!
> >Andy K0SM/2
> >
> >Richard Burrows wrote:
>
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