laser comm device in latest :Make magazine

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scottiej
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laser comm device in latest :Make magazine

Post by scottiej » Tue Jan 13, 2009 4:11 pm

don't have a link, but I noticed there's a how-to in the latest "make" magazine (the "spy issue"). It's an interesting two-way voice communicator using laser-pointers. It would be a little difficult to hold the beam steady over long distances, but would illuminate the possibility of enemy interception.
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Re: laser comm device in latest :Make magazine

Post by Jamie » Tue Jan 13, 2009 4:38 pm

scottiej wrote:don't have a link, but I noticed there's a how-to in the latest "make" magazine (the "spy issue"). It's an interesting two-way voice communicator using laser-pointers. It would be a little difficult to hold the beam steady over long distances, but would illuminate the possibility of enemy interception.
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Re: laser comm device in latest :Make magazine

Post by spacecase0 » Tue Jan 13, 2009 4:47 pm

lasers are way less likely to be intercepted than radio,
just use infrared lasers and not many people will know that you are transmitting at all.

I will have to go get that issue,
I love communications like that,
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Re: laser comm device in latest :Make magazine

Post by jrossetti » Tue Jan 13, 2009 6:44 pm

It must be mentioned that it's a point-to-point communication method, this means line-of sight, though distance is less of a concern if line-of-sight is established. I wonder how well it could perform in rain/snow?

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Re: laser comm device in latest :Make magazine

Post by crypto » Tue Jan 13, 2009 7:29 pm

At <5mw? not very. I'd say a mile or two under ideal situations, and a tenth of that in inclement weather.
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Re: laser comm device in latest :Make magazine

Post by meatshieldChris » Wed Jan 14, 2009 4:18 pm

crypto wrote:At <5mw? not very. I'd say a mile or two under ideal situations, and a tenth of that in inclement weather.
and at that power and range you'd have a hard time lining them up if you find a well collimated one. at least with higher powered lasers you can spread them a tad and still have the power for a good SNR.

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