Where can I get a detailed description of AMTOR-B's protocol? I'm not
looking for just basics, but rather enough information I could actually
write a program to decode and encode an AMTOR-B transmission. I've
done several searches on google (and other sites), but haven't found
anything that really covers the low-level details.
Thanks in advance!
Dave

Sorry, I don't have the info that you need, but I'd like
to compliment you for having a go yourself, in the
true Ham Spirit (Unlike the CB types who even
buy/copy software!)

wrote in message
oups.com...
Where can I get a detailed description of AMTOR-B's protocol? I'm not
looking for just basics, but rather enough information I could actually
write a program to decode and encode an AMTOR-B transmission. I've
done several searches on google (and other sites), but haven't found
anything that really covers the low-level details.
Thanks in advance!
Dave

writes:

Where can I get a detailed description of AMTOR-B's protocol?

The 2005 ARRL Handbook, p. 9-19, in the bibliography for the section
on AMTOR, contains the following:

CCIR recommendation 476-3, "Direct-Printing Telegraph Equipment in the
Maritime Mobile Service." Reprint available from ARRL Headquarters as
part of the Proceedings of the Third ARRL Amateur Radio Computer
Networking Conference.

With that hint, typing 'CCIR 476-3' into a search engine might turn up
a copy of the official definition online somewhere. "SITOR-B" or
"NAVTEX" might be other good search terms to try, since SITOR is what
the protocol is called in the maritime mobile service, and NAVTEX is
the service that the US Coast Guard provides using SITOR.

I realize that you want to write your own program, rather than copy or
use an existing one, but you might find the source code of hfterm
instructive. http://hfterm.sourceforge.net. It's a Linux program
that implements AMTOR, PACTOR, GTOR, and some other digital modes.

--
Chris Jewell Gualala CA USA
(No call sign yet: I'm taking elements 1, 2, and 3 in February.)

Chris,
Thanks for the info... that gave me some help in narrowing down my
search.

I think I found what I need:

http://www.universal-radio.com/catalog/books/1912.html

I'm sure this is out there somewhere on the net (or in a library), but
it might actually be worth buying instead of spending time looking.

Thanks again,
Dave


Chris Jewell wrote:
writes:

Where can I get a detailed description of AMTOR-B's protocol?

The 2005 ARRL Handbook, p. 9-19, in the bibliography for the section
on AMTOR, contains the following:

CCIR recommendation 476-3, "Direct-Printing Telegraph Equipment in
the
Maritime Mobile Service." Reprint available from ARRL Headquarters
as
part of the Proceedings of the Third ARRL Amateur Radio Computer
Networking Conference.

With that hint, typing 'CCIR 476-3' into a search engine might turn
up
a copy of the official definition online somewhere. "SITOR-B" or
"NAVTEX" might be other good search terms to try, since SITOR is what
the protocol is called in the maritime mobile service, and NAVTEX is
the service that the US Coast Guard provides using SITOR.

I realize that you want to write your own program, rather than copy
or
use an existing one, but you might find the source code of hfterm
instructive. http://hfterm.sourceforge.net. It's a Linux program
that implements AMTOR, PACTOR, GTOR, and some other digital modes.

--
Chris Jewell Gualala CA USA
(No call sign yet: I'm taking elements 1, 2, and 3 in February.)