[aprssig] Bandwidth IS THE FUTURE OF APRS
rtg at aapsc.com
Thu Oct 12 11:27:25 CDT 2006
On Thu, 12 Oct 2006, wa7nwp wrote:
>>> I do agree that the above beacon is
>> absolutely wasteful of bandwidth!
> We have to change the way we look at things.
> YouTube feeds 100 MILLION!!! Videos a day. Those Videos are in Megabytes.
> (You all saw the dramatic 4th episode of Chad Vader - right?)
Yes, and it feeds it over fiber, on clean point-to-point links, without
CSMA issues, not to mention hidden-transmitter issues, etc.
Also, YouTube, and other video-on-demand sites, as well as various
IP-streaming audio and video sites, are themselves bandwidth-limited, in
that separate bandwidth is needed for each simultaneous user. Traditional
RF broadcasting is much more appropriate for mass distribution of media.
> It's 2006. We're still running 1200 baud (nope - didn't forget the K at the
> end of that -- hard to believe.) We panic if somebody actually adds an
> extra hop to their path. Here we're counting fraking bytes in a status
Because on a 1200baud radio channel, those bytes matter.
> We have incredible technology just waiting to be put to use. We have dozens
> of vastly underused channels. We probably have Megabytes in the Microwave
> spectrum that's dead dead dead.
We DON't have the technology sufficiently developed. My meager
experiments with 9600 baud told me it's extremely difficult to keep a
single link up over a 20-mile path using directional antennas. The
sensitivity of these modems to frequency stability, seleective fading,
etc., tells me we're a long way from practical mobile high-speed packet.
We could adopt the techniques that are being implemented by the digital
cellular carriers for high-speed mobile digital transmission, but many of
those are patent-encumbred, so we have to start from scratch and develop
> Lets work on moving on - not digging a deeper hole then what we already have.
Agreed, but from where we're at, the development needs to happen first
on building a stable high-speed backbone. Unstable mobile stations will
> Quiet air is wasted air - make packets!
This sounds to me like the same kind of attitude that's got our roads
clogged with inefficient, gas-guzzling SUV's, and our children killed
trying to secure the oil to fuel them.
I plea for appropriate use of the technology at hand, and careful
adoption of newer technologies that are actually better, not just bigger
for the sake of our egos.
Rick Green, N8BJX
"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."
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