[Laser] Parabolas.

[n9jim]

Makeup mirrors work great. I've made 20+ mile paths with one and a 
semiconductor PIN diode with 4mW on the  TX side. (1KHz tone, OOK)

As long as the focus point is smaller than your RX device you are in 
fine shape.  Bare in mind you will block a small portion of the mirror 
with the RX device.

Jim
N9JIM/6

Chuck Hast wrote:

> On Sunday 11 August 2002 22:33 L, you wrote:
> 
>>Kurt,
>>
>>Good to see your posts here.  I'm also interested in reflector designs.
>>
>>KD7JYK wrote:
>>
>>>meantime try some of the cheap magnifying mirrors used for makeup, you
>>>can find them at the drug stores.  Not the best but better than nothing.
>>>
>>I have experimented with several cheap magnifying mirrors at IR freqs.
>>None of them were as good as a surplus 4" lens I picked up at a ham
>>fest.  But my wife has a magnifying mirror that is excellent.  I didn't
>>understand why she was so protective of it until she told me what it
>>cost.  $59.95!  And that was maybe 10 years ago.  It was made by Magic
>>Focus, Inc.
>>
>>
> 
> 
> Dexter et al
> I was in Bed Bath and Beyond, and came across some 6 and 8 inch
> mirrors which had very good focus ability for $19.95 for the 8 inch one.
> I do not remember what the cost on the 6 was, I am planning on going
> in and getting me 2 for a link I want to build, I could not see anything
> wrong with the product of the focus, and the focal point was not that
> distant, these mirrors were more designed for I guess checking skin
> blemishes as the focal point was only a couple of feet at most from
> the mirror. One of those mirrors and some PVC and you have a nice
> capture device.
> 
> 
>