[ARC5] Cool but Pointless

[Fuqua, Bill L]

  Just for fun, since tube guys are accustomed to playing with high voltage, look up T.E.A. Laser. Many of you have what you need to build one.
73
Bill wa4lav

________________________________________
From: ARC5 [arc5-bounces at mailman.qth.net] on behalf of Jay Coward via ARC5 [arc5 at mailman.qth.net]
Sent: Tuesday, February 16, 2016 12:57 PM
To: k1lky68 at gmail.com; vk2bcu at operamail.com
Cc: arc5 at mailman.qth.net
Subject: Re: [ARC5] Cool but Pointless

I remember a Popular Electronics article years ago on how to make your own laser comms using gas tube lasers and small telescopes along with mod/demod that you had to build.
Jay


-----Original Message-----
From: Roy Morgan <k1lky68 at gmail.com>
To: Leslie Smith <vk2bcu at operamail.com>
Cc: ARC-5 List <arc5 at mailman.qth.net>
Sent: Mon, Feb 15, 2016 2:24 pm
Subject: [ARC5] Cool but Pointless


On Feb 15, 2016, at 2:52 PM, Leslie Smith <vk2bcu at operamail.com<mailto:vk2bcu at operamail.com>> wrote:…
Re: [ARC5] The International System of Units (SI)
> ...
> In Tasmania (VK7 is a small island south of the Australian mainland) a
> group has been experimenting with long range optical communication. ... they got communication (by light)
> from Hobart to Launceston. That's about 120 miles. … That's pretty
> cool, in my book. At the same time it was quite pointless.

Leslie,

NASA might need their expertise:

From:
http://www.nasa.gov/topics/technology/features/laser-comm.html

"NASA to Demonstrate Communications Via Laser Beam

… It currently takes 90 minutes to transmit high-resolution images from Mars, but NASA would like to dramatically reduce that time to just minutes. A new optical communications system that NASA plans to demonstrate in 2016 will lead the way and even allow the streaming of high-definition video from distances beyond the Moon. … "

Searching with Google for: "Navy Laser Communication” reveals that there’s interest among naval communicators in laser technology. Qubits in the ocean anyone? (What is a qubit, anyway?)

Speaking of milliHertz - es, I wonder what frequencies are involved when an undersea earthquake happens and sends detectable waves through and around the globe of the earth.


Roy

Roy Morgan
k1lky68 at gmail.com<mailto:k1lky68 at gmail.com>
K1LKY Since 1958

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