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From: jwp@uwmacc.UUCP (Jeffrey W Percival)
Newsgroups: net.astro,net.space,net.graphics
Subject: Re: Space Telescope
Message-ID: <335@uwmacc.UUCP>
Date: Wed, 8-Oct-86 20:25:11 EDT
Article-I.D.: uwmacc.335
Posted: Wed Oct  8 20:25:11 1986
Date-Received: Thu, 9-Oct-86 03:26:05 EDT
References: <1322@rayssdb.UUCP>
Reply-To: jwp@uwmacc.UUCP (Jeffrey W Percival)
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Organization: UWisconsin-Madison Academic Comp Center
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Xref: mnetor net.astro:1602 net.space:4204 net.graphics:1327

In article <1322@rayssdb.UUCP> rxb@rayssdb.UUCP (Richard A. Brooks) writes:
>
>	(1)  Will the transmissions from the ST be PUBLIC DOMAIN?
>	(2)  Will the transmissions be scrambled or encrypted
>	(3)  What Image Processing equipment would be required
>	(4)  Does anyone have projects in the works to do this? 

The HST will transmit its data at one of 2 rates (4 kbits/sec and
1 Mbit/sec) to a TDRS satellite, which will forward the data
to White Sands.  Thence they go to the east coast via DomSat,
to be recieved at the data capture facility at Goddard.  Processing
is done there, as well as sending the signal via microwave link
to the Science Institute in Baltimore.  Before leaving the HST,
the data have Reed-Solomon encoding performed on them, and then
whatever blocking is required for the NASCOM transmission process.

I don't know much more in the way of details, but it seems to me
that it would require a bunch of effort to eavesdrop.  We had a
thermal vacuum test at Lockheed this summer, with the HST
at times being commanded remotely from Goddard, and I know that
at times, even *they* were quite pleased to get some data.
-- 
	Jeff Percival ...!uwvax!uwmacc!sal70!jwp or ...!uwmacc!jwp