[VWS] AX.25 question

Terry Fox wb4jfi at knology.net
Mon Nov 27 19:19:36 CST 2006

I am happy to help as well.  Please let me know in what context you need
info on the AX.25 protocol, or AX.25 hardware, or something else.  I no
longer live in the DC area, but would be glad to answer any questions.
tfox at knology.net

----- Original Message ----- 
From: "Mark Kanawati" <mark at spacequest.com>
To: "'Tom Azlin, N4ZPT'" <n4zpt at cox.net>; <VWS at mail.viennawireless.org>
Cc: "'Kelly'" <naryllek at gmail.com>; <tacos at amrad.org>; "'Ben Lash'"
<lash.ben at gmail.com>; "'Terry Fox'" <tfox at knology.net>; "'Matt'"
<mgreen9 at gmail.com>
Sent: Monday, November 27, 2006 7:44 PM
Subject: RE: [VWS] AX.25 question

> Greetings to all,
> I am more than happy to help, but unfortunately I am absolutely swamped
> my 2000 pound spacecraft to be launched in January.
> Typically, I much prefer an interactive conversation over the telephone or
> 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
> ------------------------------------
> 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
> AX.25 TNC) will digipeat AX.25.  So setting up a packet node would give
> a packet repeater.  I do not know what your space and power budget will
> 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
> 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
> 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
> > However, we are confused about how to use AX.25 exactly.
> > Thanks for any help.
> > Esther
> >
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