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From: jwp@uwmacc.UUCP (Jeffrey W Percival)
Newsgroups: net.astro,net.space,net.graphics
Subject: Re: Space Telescope
Message-ID: <343@uwmacc.UUCP>
Date: Fri, 10-Oct-86 12:59:36 EDT
Article-I.D.: uwmacc.343
Posted: Fri Oct 10 12:59:36 1986
Date-Received: Sat, 11-Oct-86 19:58:24 EDT
References: <1322@rayssdb.UUCP> <7203@utzoo.UUCP>
Reply-To: jwp@uwmacc.UUCP (Jeffrey W Percival)
Organization: UWisconsin-Madison Academic Comp Center
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Xref: mnetor net.astro:1615 net.space:4243 net.graphics:1335

Here's another complication.  The ST's High Speed Photometer
can sample the intensity of incoming light in several ways:
a 12-bit a/d conversion of a photocurrent, and a readout of
a photon counting device with either 8, 16, or 24 bit word size.
What's more, we can alternate between 2 internal detectors.
Our data stream can be quite complex:  detector 1 "analog",
detector 1 "digital", then repeat for detector 2, back to
detector 1, and so on.  And the information describing the
interleaving is not part of the downlinked data.  You'd have
to try and figure it out on a case by case basis by staring
at the numbers.  Whew!
-- 
	Jeff Percival ...!uwvax!uwmacc!sal70!jwp or ...!uwmacc!jwp