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Date: Sat, 23 Sep 00 19:46:07 MET
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Ham-Digital Digest Sat, 23 Sep 2000 Volume 2000 : Issue 260
Today's Topics:
Compression et all (9 msgs)
F/S JPS NIR-10 DSP noise reduciton unit
Money Maker !
PTC-II and APRS
Send Replies or notes for publication to: <Ham-Digital@UCSD.Edu>
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We trust that readers are intelligent enough to realize that all text
herein consists of personal comments and does not represent the official
policies or positions of any party. Your mileage may vary. So there.
Loop-Detect: Ham-Digital:2000/260
----------------------------------------------------------------------
Date: Fri, 22 Sep 2000 19:49:34 -0400
From: "ed_woodrick" <ed_woodrick@email.msn.com>
Subject: Compression et all
Scott,
At this point, analog signals are still taking a narrower bandwidth than a
digital signal. Commercial and government FM is already heading toward a
narrower band FM, half the width of our current FM emission.
When it gets to ATV, well as other arguments on this forum have been talking
about, 1200 is about as fast as our digital modes go. Maybe 56k, but not
anything near the 6mHz or so required by MPEG.
As some have been mentioning, our data transfer capabilities are severely
limiting our move to the digital world.
Ed
"Scott Moore" <samiam@cisco.com> wrote in message
news:39CA94C7.F72DB0F@cisco.com...
> This is going to sound like a troll, but bear with me.
>
> I have not really kept track of Ham Radio for quite a while now.
> Starting in electronics in the 1970's, I got a lot of exposure to ham,
> but never got a licence.
>
> Since I lost track of ham, there have been at least two developments
> that should hit ham radio like a bombshell, namely digital voice
> compression (mpeg) and also digital video compression (mpeg again).
> Voice compression should allow voice traffic to go to very narrow
> channel modes, with a resulting dramatic increase on the number
> of people able to get on a given band, plus the greater accuracies
> and longer range receiption afforded by digital error correction.
> Digital video, mpeg-1 style, should change ATV entirely, allowing
> ATV work in much narrower bandwidth, and much lower frequencies.
> Could it even allow DX ATV ? I don't see why mpegs cannot completely
> replace slow scan.
> I know some of this technology is pretty new, but is anyone doing this/
> working on this ?
>
> Thanks in advance.
>
> --
> Scott A. Moore is samiam@cisco.com
>
> Technicians and inventions will continually create new devices and
> theories...which invites us to constantly wait for a better system to
> arrive." James Carnes, President of the prestigious Sarnoff Research
> Center in Pinceton, New Jersey, preaches that "there is a time in any
> development when you simply must 'shoot' the engineers."
>
>
>
------------------------------
Date: Fri, 22 Sep 2000 20:20:31 -0500
From: "Charles Brabham" <n5pvl@swb.net>
Subject: Compression et all
"ed_woodrick" <ed_woodrick@email.msn.com> wrote in message
news:e3okn#OJAHA.249@cpmsnbbsa09...
>
> snip<
>
> As some have been mentioning, our data transfer capabilities are severely
> limiting our move to the digital world.
I suppose that depends on you mean by "moving to the digital world"...
If your concept includes Amateurs building digital systems of any
significant size or distribution that are "competitive" with networks built,
controlled and developed by governmental and commercial agencies, then I
have a news flash for you; Hams will NEVER be able to effectively "compete"
with entities which control resources of that type, level, and depth. - It
will never happen. Forget it. Get real.
Hams do not have the physical resources to do so, and do not have the
intellectual resources (funding, laboratories, equipment, personnel,
universities, and so on) to "play" at anything approaching that level. - And
they never will. This is simple reality.
On the other hand, Hams are in an excellent position to pursue technology
and infrastructure that governmental and commercial entities have no
interest in, and are not pursuing, themselves.
Traditionally, Hams have provided communications in those instances where
governmental and commercial communications systems have broken down or have
been pre-empted, because in these cases, "competition" simply does not
exist. What we then have to offer is MUCH better than the alternative, which
is nothing whatsoever.
Beyond that, Ham Radio communications are strictly a "hobby", and are done
on a recreational basis. Again, "competition" with non-Ham communications
does not enter the picture here. For most of Ham Radio's history, non-Ham
communication systems have been faster, more reliable, and more generally
useful than the recreational communications between Hams. There is nothing
new about this. It is simple reality and is highly unlikely to ever change,
for reasons that are obvious.
This is why Hams who do not worry about "the baud rate race" and concentrate
instead on building up viable medium/slow speed infrastructure are so much
more successful (within the pursuit of reasonable purposes, legitimate to
the hobby) than the clique who insist that only "competitive" networking is
worthwhile, and so end up achieving very little if anything. Their a vision
of Ham Radio is only as a minor parasite, hanging off of the Internet's butt
and completely dependent upon it in order to function at all. - And so by
definition becoming useless in times of disaster or emergency.
Ham Radio digital networking does not need to be as fast as the Internet in
order to be viable and functional, but it does need to be completely
*independent* of the Internet.
The most crippling limitation that Hams are currently experiencing in their
move into the digital world is the perception that we must somehow "compete"
with governmental and commercial agencies that possess resources far beyond
those available to Hams. Part of this crippling perception is the erroneous
idea that we must compete in the "baud rate race".
So when you hear a Ham saying that we must use IP and "compete" in the baud
rate race with the Internet, you can be sure that you are listening to the
very attitude that has limited and discouraged the development of digital
Amateur Radio, not one that has brought it forward or enhanced it's primary
purposes; Alternate communications during times of emergency/disaster, and
recreational communication among Hams so that independent infrastructure
will be there when needed for that emergency use.
--
73 DE Charles Brabham, N5PVL
n5pvl@swbell.net
http://home.swbell.net/n5pvl/
------------------------------
Date: Sat, 23 Sep 2000 03:06:21 GMT
From: "Cathryn Mataga" <cathryn@junglevision.com>
Subject: Compression et all
>Charles Brabham" <n5pvl@swb.net> wrote in message
news:0ATy5.512$5n5.85642@nnrp1.sbc.net...
> On the other hand, Hams are in an excellent position to pursue technology
> and infrastructure that governmental and commercial entities have no
> interest in, and are not pursuing, themselves.
>
What I think is slightly interesting is the whole patent issue. That is that
To be continued in digest: hd_2000_260B
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