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Article #15267

Re: imaging system

#15267
From: Henry Spencer
Date: Sat, 21 Nov 1992 22:54
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In article <8685@lee.SEAS.UCLA.EDU> annette@boole.seas.ucla.edu (Annette K. Nasif) writes:
>... I would like
>to have a videocamera, but the people working on telemetry say that it would
>be too difficult to transmit back that much information.  I therefore need
>to find some sort of camera, the lighter and smaller the better, that can
>take a series of snap shots (at least 8 bit resolution) which can then
>be transmitted and received on the ground...

Ask around the local ham-radio community for people doing slow-scan TV work
(the abbreviation is SSTV).

Bear in mind that there's no magic way of cutting down the amount of data
in an image.  Even at not-particularly-high resolution, say 300x300, you
are still talking about transmitting hundreds of thousands of bits per image.
Even if you spend several seconds transmitting each image, that's still a
fairly high data rate as radio transmission goes.  Just how much data *can*
your telemetry people handle?  If they can't give you at least 100Kb/s or
so, I think you're out of luck.

You might also want to check the Frequently-Asked-Questions list in
rec.models.rockets; people have done this kind of thing before.
-- 
MS-DOS is the OS/360 of the 1980s.      | Henry Spencer @ U of Toronto Zoology
              -Hal W. Hardenbergh (1985)|  henry@zoo.toronto.edu  utzoo!henry
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From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: imaging system
Message-ID: <By38y6.BIu@zoo.toronto.edu>
Date: Sat, 21 Nov 1992 22:54:04 GMT
References: <8685@lee.SEAS.UCLA.EDU>
Organization: U of Toronto Zoology
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