[VWS] AX.25 question

Mark Kanawati mark at spacequest.com
Mon Nov 27 18:44:25 CST 2006

Greetings to all,

I am more than happy to help, but unfortunately I am absolutely swamped with
my 2000 pound spacecraft to be launched in January.
Typically, I much prefer an interactive conversation over the telephone or a
face-to-face meeting.
Please find below my contact information.
You can reach me between 10:30 a.m. and 10:30 p.m. daily.

All the best


Mark Kanawati N4TPY
SpaceQuest, Ltd.
3554 Chain Bridge Road
Suite 103
Fairfax Virginia 22030  USA

Tel. 703-273-7010
Fax. 703-273-7011
Cell. 703-628-1821
Home 703-385-9737


-----Original Message-----
From: Tom Azlin, N4ZPT [mailto:n4zpt at cox.net] 
Sent: Monday, November 27, 2006 6:39 PM
To: VWS at mail.viennawireless.org
Cc: Kelly; Ben Lash; Matt; Terry Fox; Mark Kanawati; tacos at amrad.org
Subject: Re: [VWS] AX.25 question

Hi Ester,

Hi Esther,

A bunch of us around here are familiar with AX.25. The wiki has a good
description, but it should be easy for us to help you get up an on the air
with AX.25 to get some experience.

I am guessing that Thomas Jefferson High School wants to incorporate a
packet simplex repeater (aka digipeater) in your planned satellite. Most of
AX.25 TNC) will digipeat AX.25.  So setting up a packet node would give you
a packet repeater.  I do not know what your space and power budget will be.
Nor what your ability put deploy antennas will be.

A packet node is a transceiver with a TNC.  Many TNCs have small bulletin
boards (BBS) in them so there would not need to be a computer connected.
(not as interesting then but it works). The Space Station sometimes has
their VHF radio running in Packet mode as a digipeater and has the BBS
running. Once you get a TNC to play with you might set up your club station
to listen on a good mid-pass frequency (remember
Doppler) when the orbital predictions say to listen.

Does TJ's club have a TNC? I have a spare one the club can have to play
with.   And there are some small ones that might be ok for your satellite.

Terry Fox, an AMRAD Club member, was the AX.25 standard author.  He is not
currently in the area but does come up here from time to time.  Mark
Kanawati, another AMRAD member, is involved in Satellites. He might also be
able to help your TJ team.  I have also cc'd the AMRAD reflector just in
case Terry or Mark are not able to respond right away. Perhaps folks can
reply direct to you Esther.

One of the Amateur satellites in orbit was put together by AMRAD.  So they
are a possible resource for your TJ project.

73, Tom Azlin N4ZPT

HaoQi Li wrote:
> Does anybody know about AX.25 (http://en.wikipedia.org/wiki/AX.25)?  
> We're trying to incorporate a repeater function for the satellite project.
> However, we are confused about how to use AX.25 exactly.
> Thanks for any help.
> Esther

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