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From: cmoore@amdimage.UUCP (chris moore)
Newsgroups: net.ham-radio.packet
Subject: Need info on packet radio
Message-ID: <626@amdimage.UUCP>
Date: Mon, 7-Oct-85 18:57:26 EDT
Article-I.D.: amdimage.626
Posted: Mon Oct  7 18:57:26 1985
Date-Received: Sat, 12-Oct-85 21:53:23 EDT
Distribution: net
Organization: AMDIMAGE, Sunnyvale, CA
Lines: 21

Could someone please tell me where I can find more information
on packet radio?  I'd like to build up my own TNC, but I don't
know all the details of how information is exchanged.  I have
found out (although I may be wrong) that the modulation is
Bell 202 (1200 bps 1200/2200 Hz), and that data is encoded using
NRZI in SDLC frames.  (Am I right so far?)  I also have a document
on level 2 AX.25 standard, but its 3 years old and I wonder about
it's accuracy.  Any pointers to documentation or help with setting
up a station would be greatly appreciated.  I have heard about
the TAPR TNC's, but I'm determined to do this the hard way and
build my own.  Thanks in advance.

				Chris Moore

-- 

Of course we have backup tapes.  Do you want last year or the
 year before?

 Chris Moore (408) 749-4692
 UUCP: {ucbvax,decwrl,ihnp4,allegra}!amdcad!amdimage!cmoore