J-Mode & AX.25

[John Pritchard]

Hi,

Always on the lookout for a "DIY Level" lingua franca for space applications, wondering what would be your comments on "J Mode/AX.25"?

http://opensat.cc/download/DIYSatellite_en.pdf

http://www.google.com/search?q=j-mode+ax.25

If there were such a thing as a common band, modulation and encoding then perhaps things like open source TDRS become possible.

http://www.google.com/search?q=nasa+tdrs

All comments most welcome,

John

--
http://www.google.com/profiles/jdp.ulsf.net

[Joshua]

Ha ha,

I really liked this. There are amounts of basic ideas for low-cost space access. Always thre is a new concept to learn.

Best,

Joshua Tristancho

 

 

--
http://groups.google.com/group/ultra-light-space-flight?hl=en

[John Pritchard]

Yea, I like the spirit of that effort -- which complements engineering simplicity 

Here's some more information on the subject.. http://aprs.org/astars.html

After browsing that info, I don't have the impression that Mode-J is necessarily the right idea.  However the broader conception of APRS applications for example (as at 1200 baud) sounds very interesting.  

For the moment I haven't put together the user data for the APRS 1200 baud satcom channel (frequencies, modulation, etc).  But this sounds like a candidate for the essential "most reliable primary" channel for a common flight control.

[Joshua]

Yes,

APRS what we are using for the N-Prize Launcher tracking.

Thanks!

Joshua

--
http://groups.google.com/group/ultra-light-space-flight?hl=en

[John Pritchard]

I'd build a 1200 baud APRS IGate breadboard if i could find some schematics... all pointers most welcome

--
http://groups.google.com/group/ultra-light-space-flight?hl=en

--
http://www.google.com/profiles/jdp.ulsf.net

[John Pritchard]

Getting closer ;)

(XR2206 IC based modem)

http://www.klm-tech.com/technicothica/xr.html

all comments most welcome..