[CRAPRS] FW: aprs backbone for emergency communications

[Gary Bishop]

Jerry, I've been thinking about this since you sent it, and came up with some ideas.

 


 

> Date: Wed, 5 Aug 2009 17:03:37 -0500
> To: craprs at rf.org
> From: info at n-connect.net
> Subject: [CRAPRS] aprs backbone for emergency communications
> 
> Posting from the CRAPRS mailing list:
> is it possible to use the large number of aprs high level digipeaters 
> as ax.25 digipeaters? 

 

Yes, but if they are all on the same channel, it will just clog up the channel with

collisions, or grind it to a halt because of overloading.

 

 

 

>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....
>