[NLRS] Laser communications...

Sun, 29 Dec 2002 09:41:57 -0600

If there is any way you can stay with a HeNe laser or a laser diode emitting
at the same wavelength it might avoid future problems of incompatible
frequency.

There are 632 nm interference filters available which would improve daylight
performance by reducing background light levels about 20db( 3 nm 1/2 power
bandwidth) at a reasonable cost ($50 or so new, a few $ surplus)

650 or 660 nm diodes would be completely blocked by such a filter unless you
could make them cold enough to reach 632nm. As I recall the wavelength drops
by about 0.29 nm / degree C

.
----- Original Message -----
From: "Jeff Berman" <[email protected]>
To: <[email protected]>
Sent: Saturday, December 28, 2002 11:49 AM
Subject: Re: [NLRS] Laser communications...

>
> Theres a group of us down here in EN52 that are building several
> cw laser stations.  Most or all of the parts can be found at Radio
> Shack.  Radio Shack is also clearing out their laser modules for
> $5 if you can find one. (They are the laser module with 2 wires
> attached and work on 3vdc.)  Check out the Laser Communications
> page at
>
> http://www.qsl.net/wb9ajz/laser/laser.htm
>
> Enjoy and wear your sunglasses...  Jeff K9YR EN52
>
>
>
>
>
> ---------- Original Message ----------------------------------
> From: "John Hoaglun" <[email protected]>
> Reply-To: "John Hoaglun" <[email protected]>
> Date:  Sat, 28 Dec 2002 02:35:48 -0600
>
> >Maybe we could get a few of us together and build a few sets of
> gear. It
> >would be fun to get all of the parts, a prototype and get a few
> of us
> >together for a small club building event some evening or maybe on
> a weekend
> >sometime.
> >
> >I think that we could get a enough people to have a fun little
> event. It
> >would be neat to add another band.
> >
> >I wonder what the level of diffaculty is to build the two
> different designs.
> >It would be that the CW system is pretty straight forward
> compared to a
> >design that would support sound card modulation.
> >
> >Granted the sound card idea would give us the ability to work
> longer
> >distances and more room for alignment error while still making
> the QSO.
> >
> >JH
> >
> >
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>
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