Date: Thu, 23 Dec 93 04:30:02 PST
From: Advanced Amateur Radio Networking Group <tcp-group@ucsd.edu>
Errors-To: TCP-Group-Errors@UCSD.Edu
Reply-To: TCP-Group@UCSD.Edu
Precedence: Bulk
Subject: TCP-Group Digest V93 #331
To: tcp-group-digest
TCP-Group Digest Thu, 23 Dec 93 Volume 93 : Issue 331
Today's Topics:
2 KBPS on 303 MHz for $49
AX.25
MSYS<>JNOS Serial Connection !?
TCP-Group Digest V93 #330
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Date: Wed, 22 Dec 1993 17:26:55 -0600
From: bob@ke9yq.ampr.org (Bob Van Valzah, ke9yq)
Subject: 2 KBPS on 303 MHz for $49
To: tcp-group@ucsd.edu
I see an ad for a "Wireless Data Link" that'll go "2 KBPS over 150 ft. with
a 9" antenna" for $49.95 in a home automation catalog I receive. "Shielded
super-regenerative type receiver with exceptional -98 dBm sensativity and
surface mount technology!" Tx is 1" x 1.75" and Rx is 1.6" x 2.2".
1-800-266-8765. Minimum order is $100 or I'd've bought a pair to play
with.
The photo is difficult to read, but it looks like it's made by Linear
Systems. Anybody ever heard of them?
It operates on 303.875 MHz. Is there anything special about the frequency
or are they just staying below the Part 15 power limits?
It dawned on me that these might be usable with a pair of gunnplexers
offset by 303.875 MHz to make a longer range link. Whaddya think?
All comments appreciated.
73, Bob, ke9yq
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Date: Wed, 22 Dec 93 17:52:26 GMT
From: Alan Cox <iiitac@pyramid.swansea.ac.uk>
Subject: AX.25
To: tcp-group@ucsd.edu
I've uploaded the first cut at AX.25 for Linux I've done (for Linux 0.99.14e
and the standard networking). It gives you AX.25 but not NETROM as a user
socket layer socket(AF_AX25,SOCK_SEQPACKET,PF_AX25) etc. and also IP
over UI frames (not yet connected mode too).
It can't do digipeating of any kind and it doesnt generate RNR correctly
or pthresh or do re-ordering of frames.
As they say however.. it works
[Aside] Any *BSD people interested in this should note its derived straight
from the NET-2 LAPB in the BSD net-2 release, so taking it and the LAPB
originalk should let anyone reverse most of it back into BSD.
Alan
------------------------------
Date: Wed, 22 Dec 93 20:22:30 MET
From: iw5dhe@radio-gw.cnuce.cnr.it (Pierpaolo Pernici)
Subject: MSYS<>JNOS Serial Connection !?
To: tcp-group@ucsd.edu
Hello to everyone in the list,
I would know if it's possible to link a MSYS-box (running in one PC) to
a NOS-box (running in another PC). I want to use the advanced features
of the jnos (i.e. pop3) for the TCPIPers and the FBB-like features of
the msys for the ax25-fwd (compressed) and for the "standard" users :)
Does anyone know a method to link the two things together !?
Thanks a lot for your reply
73 & Seasons-Greetings
Pierpaolo IW5DHE
---
73's de Pierpaolo, IW5DHE | Internet : pernici@mammolo.cnuce.cnr.it
S.Pietro Belvedere (Pi) Italy | AmprNET : iw5dhe@gw.iw5dam.ampr.org
RadioGW/Team Member | AX.25 : iw5dhe@iw5cmm.#pi.ita.eu
------------------------------
Date: 22 Dec 1993 10:26:10 GMT
From: "Robert D Nielsen" <0060880@CCMAIL.EMIS.hac.com>
Subject: TCP-Group Digest V93 #330
To: TCP-Group@UCSD.EDU
In TCP-Group Digest #330, kf5mg writes:
>At some point... I want to make the TNC ( MFJ-1270B ) a digital,
>bit-regenerating repeater. Either on 1200b or 9600b. Will the software handle
>this, or would I have to do a hardware mod to the TNC? If it's a hardware
>mod... is it the same mode for both a 1200b TNC and a 9600b tnc? Thanks.
There are hardware implementations for doing the bit regeneration, although
I expect one could do it in software. The TAPR 9600 bps modems have the
circuitry on the board; the parts required are optional with the kit (and
you don't even need to attach a TNC, if you want to have only the
regenerator). NJ7P and N7OO had a paper in one of the ARRL Computer
Networking Conferences on modifying a TNC-2 to be a regen at 1200 (as I
recall it was only a single chip that had to be added). It can also be
accomplished by interfacing an external modem to a TNC (see the Net/Rom
manual for more on this method).
Bob Nielsen, w6swe@tapr.org
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End of TCP-Group Digest V93 #331
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