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PA2AGA > TCPDIG 19.09.96 04:38l 179 Lines 6290 Bytes #-10881 (0) @ EU
BID : TCP_96_193B
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Subj: TCP-Group Digest 96/193B
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Date: Wed, 18 Sep 96 09:18:59 MET
Message-Id: <tcp_96_193B>
From: pa2aga
To: tcp_broadcast@pa2aga-10
Subject: TCP-Group Digest 96/193B
X-BBS-Msg-Type: B
That's because our interleaver span is limited to one frame time (20 ms)
to minimize voice delay. You can do much better in a data packet network
with big packets.
Of course, at some point the fading gets so fast that you start to
lose symbol coherence. But with modulation schemes like DPSK and M-ary
orthogonal that require no coherence from symbol to symbol, you have a
considerable margin that actually gets better with increasing data
rate (until you hit multipath-induced ISI, for which the only real
answer is spread spectrum and a RAKE receiver.)
Yes, I'll be at DCC, and I've been invited to give a 1/2 hour informal talk
on the state of my coding and modulation software.
Phil
------------------------------
Date: Mon, 16 Sep 96 10:28:46 -0300
From: py5vs@py5vs.ampr.org
Subject: How to use a baycom modem with TNOS/Linux?
The VHF port at 1200 bps of our gateway sometimes hangs (it looks to be a
memory problem in the TNC). To avoid this trouble, and using existing
material,
we want to use a baycom modem in that port.
So, here is the question: how can we drive a baycom modem in TNOS running
under Linux?
Any help will be appreciate!
Carlos A. Schneider
py5vs
___________________________________________________________________________
py5vs@py5vs.ampr.org py5vs@arpa.py5ufp-5.ampr.org PY5VS@PU5YSN.#PR.BRA.SA
------------------------------
Date: Mon, 16 Sep 1996 17:53:44 -0400 (EDT)
From: "Brian A. Lantz" <brian@lantz.com>
Subject: How to use a baycom modem with TNOS/Linux?
On Mon, 16 Sep 1996 py5vs@py5vs.ampr.org wrote:
> The VHF port at 1200 bps of our gateway sometimes hangs (it looks to be a
> memory problem in the TNC). To avoid this trouble, and using existing
material,
> we want to use a baycom modem in that port.
> So, here is the question: how can we drive a baycom modem in TNOS running
> under Linux?
> Any help will be appreciate!
The Linux 2.xx kernels have a device driver for Baycom modems. You will
need to make this work, as TNOS under Unix does NOT talk to any devices
except through a kernel device driver, unlike under DOS where the raw
hardware gets talked to directly (in the absence of a REAL OS).
-----------------------------------------------------------
Brian A. Lantz http://www.lantz.com brian@lantz.com
REAL PORTION of Microsoft Windows code:
while (memory_available) {
eat_major_portion_of_memory (no_real_reason);
if (feel_like_it)
make_user_THINK (this_is_an_OS);
gates_bank_balance++;
}
------------------------------
Date: Tue, 17 Sep 1996 08:43:47 +1000
From: Terry Dawson <terry@perf.no.itg.telstra.com.au>
Subject: How to use a baycom modem with TNOS/Linux?
py5vs@py5vs.ampr.org wrote:
>
> The VHF port at 1200 bps of our gateway sometimes hangs (it looks to be a
> memory problem in the TNC). To avoid this trouble, and using existing
material,
> we want to use a baycom modem in that port.
> So, here is the question: how can we drive a baycom modem in TNOS running
> under Linux?
The original Linux kernel based Baycom driver (the one supplied in
off-the-shelf
kernels) looks like a kiss tnc. So you should be able to configure a
kernel Baycom
driver and use TNOS to open it as you would a 'real' KISS tnc.
The new kernel Baycom driver looks (will look?) like a conventional
linux network
device so that wouldn't work, you'd have to configure it then link TNOS
to your
kernel with a pty device.
regards
Terry
------------------------------
Date: Mon, 16 Sep 1996 05:45:03 -0500
From: Steve Sampson <ssampson@oklahoma.net>
Subject: Networking and People
Many years ago (probably about 6 or 7) there was a local Ham who
went everywhere to all the Hamfests and club meetings, trying to
organize the Hams into packet networking. He used the old
corporation that existed and was still in effect, as the basis of
getting commercial tower support (a power company). So the price
was set at $25 a year membership. He probably would have agreed
to less, but those he contacted seemed positive about the rate.
His goal was to network the state at a minimum of 9600.
Anyway, he probably got 4 subscriptions. The ARRL wasn't interested,
nor were any of the emergency coordinator groups.
Oklahoma only has about 3 or 4 population centers, so it wasn't
going to be a big deal.
After a year he finally moved on and gave up.
I relate this story, as an example why there will never be a
radio digital network of any value in this country. Number 1, the
major organizations don't support it, number 2, no one knows what
to do with it when it's built. The emergency coordinators have no
plan to incorporate digital modes. These established organizations
are CW and Pencil based. Most don't even have computers. Basically,
you could drop a network on these peoples desk, and they wouldn't
use it (couldn't).
Today only FEMA has the most advanced capabilities, which leave these
Amateur organizations relegated to serving cookies and soda-pop to
the real people. If you want to know how to solve your emergency
management problem, look at those big FEMA trucks with Sat dishes.
Very impressive, very effective. Packet radio looks like CW in
comparison.
FWIW
Steve
------------------------------
Date: Mon, 16 Sep 1996 13:51:38 -0400
From: friendb@thorin.atsc.allied.com (Friend, Bruce A.)
Subject: Networking and People
Steve,
I never heard a more pessimistic outlook on the future of ham networks in my
life. And also never heard one more correctly stated. I think packet was
fun when it was new and experimental. Unfortunately, I don't believe it
To be continued in digest: tcp_96_193C
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