Date: Sat, 26 Feb 94 04:30:46 PST
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Subject: Ham-Space Digest V94 #40
To: Ham-Space
Ham-Space Digest Sat, 26 Feb 94 Volume 94 : Issue 40
Today's Topics:
RDSS and CDMA
Whereabouts of Instant Track "B" Patch
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Date: 25 Feb 1994 14:41:11 GMT
From: solaris.cc.vt.edu!sycamore!bergst@uunet.uu.net
Subject: RDSS and CDMA
To: ham-space@ucsd.edu
As part of a course I'm taking, we are studying a dedicated RDSS satellite system which
provides RDSS services and two-way messaging. Being a controls student, some of the
satellite communcations issues are unfamiliar to me. Would you please answer the
following questions?
The original system proposed to have 3 satellites each with 8 beam antennas to
cover the continental US (CONUS?). The transmission method is to be CDMA. Now, the
system is to use 4 single beam satellites to replace two of the 8 beam satellites.
It has been said that this configuration will reduce the number of RDSS systems which
can occupy the allocated bandwidth. Why? (a 70% reduction according my information)
The smaller satellites will have have smaller operating powers. This is said to
reduce the number of simutaneous users of the CDMA system. Again...why?
Thank you in advance for any help you provide,
Robert Bergstrom
P.S. The course is on financing and operation technology companies. Unfortunately,
being a non-engineering course, the technical arguements are a bit sketchy, and I'm out
of my element.
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Date: 25 Feb 1994 16:37:00 GMT
From: mvb.saic.com!unogate!news.service.uci.edu!usc!howland.reston.ans.net!usenet.ins.cwru.edu!cleveland.Freenet.Edu!dg651@network.ucsd.edu
Subject: Whereabouts of Instant Track "B" Patch
To: ham-space@ucsd.edu
The following paragraph discussing the "B" patch for the InstantTrac
program was found a the archive.afit.af.mil site. The patch is not in
the pub/space directory but is available via the Celestial BBS (TS Kelso,
SYSOP).
>[1] ITPATCH2.ZIP 9111 5-May-1992 01:53
> Patch #2 to InstantTrack 1.00. This program updates InstantTrac
> or 1.00a to version 1.00b. This patch is mandatory for anybody
> installed Patch #1, because it corrects a slightly dangerous bug
> Patch #1. Like Patch #1, this patch solves the problem of different
> NASA Keplerian elements file formats by permitting either format
> read in by InstantTrack.
Is there an ftp site with InstantTrac 1.00b version/patch?
Thanks for any leads.
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End of Ham-Space Digest V94 #40
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