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PA2AGA > TCPDIG 03.04.97 01:30l 224 Lines 7926 Bytes #-10671 (0) @ EU
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From: pa2aga
To: tcp_broadcast@pa2aga-1
Subject: TCP-Group Digest 97/28C
X-BBS-Msg-Type: B
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
Michele Debandi wrote:
But if we stop developement of new techniques (and digital
techniques are
new), amateur radio will soon die, because young people will not be
actracted,
or worse will be going to be a de-luxe CB.
I am young, and I look into this situation in a digital way, too. I am
new to wireless,
and at the first glance, -from recent articles posted to this group- I
understand the
past, today and the future of amateur radio and digital radio. There are
several reasons
that I am interested in this subject; First of all, I know wire
transmission is at giga levels,
and wireless is hopelessly slow for high bandwidth applications at
amateur level.
Could you explain, If you omit "digital techniques" --that you relate
with-- how far
amateur radio can develop ? If finding a solution to amateur radio
digitally is making
amateur radio die, what kind of non-digital solutions can exist? (
Infact really; I am
a computer engineer, not electronics ; and I can only make digital
design.. )
--
Emre Celebi, Senior Computer Engineer @ BU.CmpE,NetLab
mailto:emre@mercan.cmpe.boun.edu.tr
"I can trust an OS which I have sources for.."
The Half-Life of an Engineer... is only a few years..." Craig Barrett, Intel
Co.
------------------------------
Date: Fri, 07 Mar 1997 08:54:45 +1100
From: Terry Dawson <terry@perf.no.itg.telstra.com.au>
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
Michele Debandi wrote:
> (1) I'm also a V-UHF mountain climber for doing contest, and I find
> this activity really fun, more than setup balky TNOS, X1j, linux and
> similar stuff.
You mountain climb with radios and operate contests from on top of
mountains ? That sounds like crazy fun :) Have you operated packet
that way ?
The one aspect of radio that still really lights me up is mobile and
portable operation. I'd seriously love to be able to operate
packet/digital comms in a pedestrian mobile capacity.
Terry
------------------------------
Date: Sat, 08 Mar 1997 12:14:43 -0500
From: Jim Durham <durham@w2xo.pgh.pa.us>
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
Terry Dawson wrote:
>
> Michele Debandi wrote:
>
> > (1) I'm also a V-UHF mountain climber for doing contest, and I find
> > this activity really fun, more than setup balky TNOS, X1j, linux and
> > similar stuff.
>
> You mountain climb with radios and operate contests from on top of
> mountains ? That sounds like crazy fun :) Have you operated packet
> that way ?
>
> The one aspect of radio that still really lights me up is mobile and
> portable operation. I'd seriously love to be able to operate
> packet/digital comms in a pedestrian mobile capacity.
>
One idea that I've not seen explored is some form of digital HF
communications via SSB (other than 300 baud packet 8=) ). A DSP
filter kinda approaches this, but are there any other algorithmns
that could be applied to either enhance analog SSB or is there a digital
transmission method that could be applied that would improve
reliability?
I'm just awe-struck when I see what the little Radio Shack DSP can do
on 40 meters where there is a howling broadcast AM carrier mixed with
the
guy you are listening to. The software says "Carrier? No intelligence
there..
goodbye!.. and it's *gone*..no more "howl".
I also like crazy stuff like 30 meter CW mobile. I have run packet
mobile
on 2 meters as well. (The trick is to not *drive*, let someone else do
that!).
Has anyone ever tried running 28.8 modems over a duplex link? These
modems
usually have a "leased line" mode.
-Jim, W2XO
------------------------------
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: Sun, 09 Mar 1997 12:48:44 -0500
From: Jim Durham <durham@w2xo.pgh.pa.us>
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
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?
-Jim Durham
------------------------------
Date: Sun, 9 Mar 1997 21:41:12 +0000 (GMT)
From: Alan Cox <alan@cymru.net>
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
> 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.
Phone lines are very stable and don't get phase shift problems as much,
nor multipath
------------------------------
Date: Mon, 10 Mar 1997 00:25:43 GMT
From: "Dr. Rich Artym" <rartym@galacta.demon.co.uk>
Subject: 2000's Amateur radio (was:Benefits of AMPR IP encapsulation)
In message <1@iw1cfl.ampr.org>, Michele Debandi writes:
> As I can see, when you try to build something in SHF you must have, other
> the knowdlege, a lot of costly instrumentation.
It's coming down in price. This afternoon I went to an amateur radio
rally in London and bought myself one of those new midget 2.8GHz counters
featuring a 16-bar signal-strength indicator, for 69 pounds. No doubt
they're even cheaper than that in the States. And, there's quite a lot
of microwave technology filtering down from the SatTV world that provides
very nice components for amateur instrumentation or actual on-air systems,
for those that can do some construction work. Combined with some surplus
or fairly easily constructed attenuators and a 2/70 handheld as a signal
generator and general detector, you've got the basis of a fairly capable
amateur RF lab. And there's lots of reading matter available on the topic
for those that want to get their hands dirty and to learn.
Cost of instrumentation really isn't the huge problem in SHF construction
that it's commonly thought to be. We'd all like to have a 10GHz spectrum
analyser, but it isn't essential for typical amateur SHF work.
Rich.
--
########### Dr. Rich Artym ================ PGP public key available
# galacta # Email : rich@galacta.demon.co.uk 158.152.156.137
# ->demon # Web : http://www.galacta.demon.co.uk - temp page only
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