[Laser] Lasers vs LEDs & ARRL contests

[John E. Matz]

I know ... not really necessary discussion, but an interesting thread 
anyway.  I originally used a "low-tech" method ... a modified muffin fan on 
a HeNe tube and a morse code key with a thick bent wire on it that blocked 
the laser beam ... yes, it had some problems with staying "aimed" during 
keying.  That's why it was eventually replaced with a "relay"/solenoid 
shutter driven by the key, which was now separate from the laser assembly. 
I think I have the core of that around here somewhere ...
John Matz KB9II
----- Original Message ----- 
From: "KD7JYK DM09" <kd7jyk at earthlink.net>
To: "Free Space LASER Communications" <laser at mailman.qth.net>
Sent: Sunday, July 20, 2008 10:45 PM
Subject: Re: [Laser] Lasers vs LEDs & ARRL contests


>: >CW; you can't really do that with any source that requires higher
> : >voltage, e.g. a gas tube like a HeNe,
>
> A plate on either side of the tube and RF modulator work nicely.
>
> Kurt
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