I really do not understand Graham's proposal: a narrow band spread
spectrum system? I really need some more clarification about this.***
Ok may be a bit like calling a steam train a iron horse, dose the
same thing but a little differently
Spread spectrum : may not be quite the intended
Graham wrote:
I really do not understand Graham's proposal: a narrow band spread
spectrum system? I really need some more clarification about this.***
Ok may be a bit like calling a steam train a iron horse, dose the
same thing but a little differently
Spread spectrum : may not
Again, AX.25 is not suitable for many reason so a new standard is needed.
It is based on X.25 that assumes a reliable link which is obviously not the
case with RF. Simply tacking some kind of FEC onto AX.25 will not suffice.
AX.25 includes message routing which is inappropriate for that level
I've got to agree with Jose here. AX.25 works pretty well on VHF, but
falls apart on HF. But AX.25 is a link-layer protocol, not the whole
suite of stuff that got crammed into a TNC. AX.25 may have been derived
from the X.25 landline protocol, but using the obsolete landline modem
under it is
My experience has been that the weakest point on HF packet were a too
feeble modem, losing frames with just one erroneous bit and bad,
aggressive parameters. There were other reasons, like stations not zero
beat on each other, hidden stations, etc, nothing to do with the
protocol. I have been
Paul L Schmidt, K9PS wrote:
I've got to agree with Jose here. AX.25 works pretty well on VHF,
but falls apart on HF. But AX.25 is a link-layer protocol, not the
whole suite of stuff that got crammed into a TNC. AX.25 may have
been derived from the X.25 landline protocol, but using the
-- Forwarded message --
From: Tomek SP5UAF [EMAIL PROTECTED]
Date: Wed, Aug 6, 2008 at 6:33 PM
Subject: Digital DX LA/SP7VC (EU-076)
To: [EMAIL PROTECTED]
Hi,
Just to let you know Przemek Mek SP7VC will be active from
Lofoten Islands (EU-076, grid JP67) on August 8 - 15.
I suggest anyone interested in this topic start by reading
http://citeseer.ist.psu.edu/cache/papers/cs/2504/http:zSzzSzpeople.qualcomm.
comzSzkarnzSzpaperszSznewlinkpaper.pdf/karn94toward.pdf by Phil Karn KA9Q.
If anyone does not recognize his name or call then research him because he
is an icon
Rud Merriam wrote:
I suggest anyone interested in this topic start by reading
http://citeseer.ist.psu.edu/cache/papers/cs/2504/http:zSzzSzpeople.qualcomm.
http://citeseer.ist.psu.edu/cache/papers/cs/2504/http:zSzzSzpeople.qualcomm.
comzSzkarnzSzpaperszSznewlinkpaper.pdf/karn94toward.pdf by
Rud Merriam wrote:
You mention protocol layers. Which model do you want to use for
discussion,
OSI or the Internet model? Perhaps not a big question since layers 1
2 are
the same but once we start moving up the stack they differ.
I have a problem with the formatting on this
Rick W. wrote:
Hi Paul,
Sounds like you might be getting caught up with some of your other work
and can devote some time again to digital modes:) For those who are not
aware, it was Paul's paper on ARQ concepts that lead to development of
several current uses of ham radio ARQ modes.
Here is a presentation by Phil with the same information:
http://www.qsl.net/n9zia/newlink/page1.html
The paper at a different URL: http://www.ka9q.net/papers/newlinkpaper.pdf
Phil's papers: http://www.ka9q.net/papers/
Rud Merriam K5RUD
ARES AEC Montgomery County, TX
12 matches
Mail list logo
