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PA2AGA > TCPDIG 24.10.96 00:50l 149 Lines 4583 Bytes #-10845 (0) @ EU
BID : TCP_96_224B
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Subj: TCP-Group Digest 96/224B
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Date: Wed, 23 Oct 96 18:30:38 MET
Message-Id: <tcp_96_224B>
From: pa2aga
To: tcp_broadcast@pa2aga-1
Subject: TCP-Group Digest 96/224B
X-BBS-Msg-Type: B
permanent magnets as passive stabilizers, etc.
Unfortunately, an overriding concern for absolute backward
compatibility (exemplified by the recent Mode B debate) has caused
AMSAT to stagnate. Actually, it's worse -- we're now attempting to use
brawn instead of brains, the P3D behemoth being the best example.
Phil
------------------------------
Date: Mon, 21 Oct 1996 21:42:35 +0200 (EET)
From: Matti E Aarnio <mea@mea.cc.utu.fi>
Subject: 2300 MHz band reallocated
> > Hmm.. Phase-5 has a bit too long delay roundtrips, however more
> > Phase-3s, and perhaps Phase-4s will be made. Microsats propably
> > can't do it.
>
> I don't understand this comment. Round trip delay can affect protocols,
> but it is independent of the RF link calculations.
Phase-5 is Mars-Probe!
We would really be pushing the envelope -- and TCP/IP on it :-)
> The microsats are *very* inefficient in their downlinks. They have
> enough downlink power to support megabit data rates (with typical
> Oscar antennas and proper FEC, and assuming sufficient spectrum) but
> they have trouble running at even a kilobit because of a series of bad
> system design choices.
I stand corrected -- which details at the system design
you consider bad ?
> Phil
/Matti Aarnio
------------------------------
Date: Mon, 21 Oct 1996 12:21:16 -0700 (PDT)
From: Phil Karn <karn@qualcomm.com>
Subject: 2300 MHz band reallocated
Right, my point is that 250 KHz (or even 500 KHz) is too narrow to make
full use of the EIRP that P3D can generate on most of its bands when
efficient FEC is used.
Lyle Johnson has agreed to add a rate 1/2 K=7 convolutional encoder
(an old NASA standard used since Voyager) to the 153.6 kb/s RUDAK
downlink. With 20W on 70cm, this will yield the ability to receive
(1/2 * 153.6) = 76.8 kb/s from apogee on an *omnidirectional* antenna.
Any real antenna, even a simple patch, will have margin to burn.
So it would have been very nice to go even faster, which means wider.
While the room may not be available on 70cm, and as you say the HELAPS
amplifiers may not handle a wider bandwidth, how about putting in a
direct path from RUDAK to the 10 GHz TWTA (or possibly 24 GHz)
downlink that runs even faster?
Phil
------------------------------
Date: Mon, 21 Oct 1996 22:50:35 +0100
From: Martino <ik4drv@provincia.ra.it>
Subject: IP for San Marino Republic ??
Hi all.
Does anyone knows what number has been assigned to San Marino Republic (T7),
on
44.xxx domain ??
Just in case that national domain wasn't be assigned yet, who provides this
number ? I mean, is there a commitee or organization which I/they have to
write to ?
I post this request for T77IG, but answer back to me.
Many thanks in advance.
73 's Martino
------------------------------
Date: Mon, 21 Oct 1996 07:33:15 -0500 (CDT)
From: "Bill Walker" <bw@student.ecok.edu>
Subject: wampes on FreeSCO
I received two replies to my recent query about running ham tcp/ip
under the new FreeSCO OS. One was a helpful report concerning work
in progress, and the other was basically a flame taking me to task for
not running Linux instead.
I report that this weekend I managed to make the latest wampes run
under FreeSCO. (Compile it as though it was a Linux box.) The diffs
are insignificant, but if someone wants them I'll make them available.
I would still be interested in other packages for ham tcp/ip under
SCO Unix.
Tnx es 73 de Bill W5GFE
--
Bill Walker Ph.D.
Chairman, Dept. of Computer Science
East Central University
Ada, Oklahoma 74820-6899
e-mail: bw@cs.ecok.edu
phone: 405 332 8000 ext. 594
FAX: 405 332 4616
------------------------------
End of TCP-Group Digest V96 #224
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