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[aprssig] APRStt software?

Scott Miller scott at opentrac.org
Tue May 19 16:31:08 UTC 2009


Ah, I missed that part.  The SR1 actually has 4 MB of flash storage 
(going up to 8 MB soon due to component obsolescence), so it has space 
for a database, but I don't like the scheme.

Has anyone actually figured out what the rate of hash collisions is 
likely to be?  I think it's going to be higher than the spec implies. 
Looking at the stations around here, I see that a bunch of them would 
have the same first 3 digits, despite representing 5 or 6 different 
callsign prefixes.

I don't see how it's good enough that it works MOST of the time, if the 
user doesn't know in advance if it's going to work or not.

If someone can show me a BNF specification for APRStt that shows there's 
no ambiguity in the message definitions, and can show that hash 
collisions aren't going to be significant, and that the benefits of this 
whole scheme outweigh the complexity and implementation effort, then 
maybe I'll work on it.  Until then - and I mean no disrespect to anyone 
here - I've got enough projects to keep me busy, and someone else can 
deal with the early adopter headaches.

Scott
N1VG

Lynn W. Deffenbaugh (Mr) wrote:
> If I remember the APRStt spec correctly, it actually requires a DB of 
> callsign shortcuts that might be quite a challenge for the OT1+ to 
> hold.  I haven't read the spec recently, but don't get your hopes up of 
> doing the whole thing inside a constrained device.
> 
> Lynn (D) - KJ4ERJ
> 
> Chris Kantarjiev wrote:
>> I was thinking that it would be nice to add to the KISS version of
>> the OT1+ ... hear touch tones, inject KISS APRS packet into the
>> output stream ...
>>
>> 73 de chris K6DBG
>>
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