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PA2AGA > TCPDIG 03.04.97 02:07l 234 Lines 7897 Bytes #-10671 (0) @ EU
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Subj: TCP-Group Digest 97/28E
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Date: Wed, 02 Apr 97 21:53:09 MET
Message-Id: <tcp_97_28E>
From: pa2aga
To: tcp_broadcast@pa2aga-1
Subject: TCP-Group Digest 97/28E
X-BBS-Msg-Type: B
last twelve months when this issue was last brought up. Perhaps someone
has it archived.
> Please don't say "So and so won't work". I'm interested in the reasons
> *why* you say it won't work. Did you try it?
No more than I've tried jumping off a building while flapping my arms :-)
Laws of physics, etc :-) :-)
Regards,
Graham.
--
------------------------------------------------------------------------
-------
Graham Broadbridge Internet
<grahamb@peachy.apana.org.au>
Senior Network Engineer AmprNet
<vk2yui@gw.vk2yui.ampr.org>
Insurance Network Services P/L <vk2yui@amsat.org>
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-------
------------------------------
Date: Tue, 11 Mar 1997 19:58:52 +1100 (EST)
From: csmall@gonzo.triode.net.au
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
Jim Durham typed:
> Graham Broadbridge wrote:
> >
> > On Sat, 8 Mar 1997, Jim Durham wrote:
> >
> > > Has anyone ever tried running 28.8 modems over a duplex link? These
> > > modems usually have a "leased line" mode.
> >
> > A radio link is nothing like a copper link. Even a 9k6 phone modem
> > would not work at all over radio.
> >
>
> Huh? A radio link at 5KHZ FM should be *better* than a copper link.
> Phone lines have a very sharp roll-off at 3khz that 5KHZ fm does
> not have.
>
> Please don't say "So and so won't work". I'm interested in the reasons
> *why* you say it won't work. Did you try it?
I heard that it is not the bandwidth or the S/N, but the main problem is
something to do with phase. You don't get much phase info from a FM link.
- Craig
--
// /\ | | | Craig Small VK2XLZ @home: csmall@gonzo.triode.net.au
||==||===|==|=| [44.136.13.17] @play: csmall@gonzo.vk2xlz.ampr.org
\\ \/ | | | finger csmall@triode.net.au for PGP key!
------------------------------
Date: Tue, 11 Mar 1997 23:48:09 -0800 (PST)
From: Phil Karn <karn@qualcomm.com>
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
>Phone lines are very stable and don't get phase shift problems as much,
>nor multipath
Phone lines generally also enjoy much higher signal-to-noise ratios
than most (though not all) radio links. This has a profound effect on
the optimal modulation and coding design.
Rather than repeat everything I said a few months ago, check the archives
and grep for "Shannon"...
Phil
------------------------------
Date: Wed, 12 Mar 97 15:18:00 -0000
From: mikebw@bilow.bilow.uu.ids.net (Mike Bilow)
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
Phil Karn wrote in a message to Mike Bilow:
PK> check the archives and grep for "Shannon"...
Just how likely is that to produce significant results? :-)
-- Mike
------------------------------
Date: Wed, 12 Mar 1997 11:50:39 -0800 (PST)
From: "Dana H. Myers" <myers@bigboy.West.Sun.COM>
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
>
>
> Phil Karn wrote in a message to Mike Bilow:
>
> PK> check the archives and grep for "Shannon"...
>
> Just how likely is that to produce significant results? :-)
Oh, I don't know. Someone might flame Shannon and Karn at the same
time. Why think when you can flame instead?
I know this is noise. At least it ain't a flame.
Dana K6JQ
Dana@Source.Net
------------------------------
Date: Sun, 9 Mar 1997 15:44:14 +1100 (EST)
From: Graham Broadbridge <grahamb@peachy.apana.org.au>
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
On Sat, 8 Mar 1997, Jim Durham wrote:
> Has anyone ever tried running 28.8 modems over a duplex link? These
> modems usually have a "leased line" mode.
A radio link is nothing like a copper link. Even a 9k6 phone modem
would not work at all over radio.
Graham.
-------------------------------------------------------------------------------
Graham Broadbridge Internet <grahamb@peachy.apana.org.au>
Marsfield NSW AmprNet <vk2yui@gw.vk2yui.ampr.org>
Australia <vk2yui@amsat.org>
-------------------------------------------------------------------------------
------------------------------
Date: Thu, 13 Mar 1997 10:28:23 +1100
From: Terry Dawson <terry@perf.no.itg.telstra.com.au>
Subject: 2000's Amateur radio (was:Benefits of AMPR IPencapsulation)
Charles Brabham wrote:
> Actually, packet BBS client/server software has left *NOS far, far behind
> in development. This is one reason the new LINUX version of "FBB" BBS has
> hams dropping *NOS like a hot potato.
Certainly FBB for Linux has stirred up some healthy interest in Linux.
Don't forget though that the Linux kernel implementation of AX.25
and NetRom have at least one of their roots in NOS. At least in part the
Linux kernel amateur radio protocol support is a child of the work on
NOS. Certainly in my experience the people who have most avidly adopted
Linux as a platform are those that have happily worked with NOS for many
years and moved onto Linux because it presents the best opportunity to
develop the *applications* that can take most advantage of the stable
underlying protocol base that NOS was a prime mover in having developed.
FBB is one such application.
Terry
------------------------------
Date: Fri, 14 Mar 97 15:06:00 -0000
From: mikebw@bilow.bilow.uu.ids.net (Mike Bilow)
Subject: 2000's Amateur radio (was:Benefits of AMPR IPencapsulation)
Terry Dawson wrote in a message to Mike Bilow:
TD> Certainly in my experience the people who have most avidly
TD> adopted Linux as a platform are those that have happily worked
TD> with NOS for many years and moved onto Linux because it
TD> presents the best opportunity to develop the *applications*
TD> that can take most advantage of the stable underlying protocol
TD> base that NOS was a prime mover in having developed. FBB is one
TD> such application.
Personally, I think it was because I had my hands in the NOS memory allocator
so many times that I never wanted to see it again. :-)
-- Mike
------------------------------
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