[CRAPRS] aprs backbone for emergency communications

Jerry Pasker info at n-connect.net
Wed Aug 5 17:03:37 CDT 2009


is it possible to use the large number of aprs high level digipeaters 
as ax.25 digipeaters?  1200 baud is slow, and my past experiences 
using it to transfer files (back in the early 90s, for storm chasing) 
used to yield a throughput of 600-900 bps when transferring files. 
and then even worse at 150-300bps when using a digipeater in the 
middle.  I know channel congestion would be a huge problem trying to 
use aprs digis, and it would be slow as heck, but in an emergency, 
you take what you can get.

you wouldn't surf the internet with it, and would not even attempt to 
transfer even graphical weather map files, but i envision a scenario 
where it would be desirable to be able to send simple text traffic 
that would be too hard to relay over the air with voice comms 
reliably.  for example, (from a year ago) a list of houses and names 
of those holding out and staying behind after a a flood evacuation....

aprs is entirely unnumbered and unconnected, and that's what makes it 
work well.  it also seems like that would lend itself to useful, but 
slow data communications over a fairly wide area.

anyone have any info on using digis to connect up to tncs far and 
wide, or passing files on 144.390?

-jerry


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