Order Tray | Contact Us | Home | SIG Lists

[aprssig] APRS Messenger now has APRS over PSK-63

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Mon Mar 1 04:22:25 UTC 2010


Stephen H. Smith wrote:
> In the real world of noise, trash and constantly shifting propagation 
> on HF, Mic-E makes a major difference in the success rate of posits on 
> HF.     In experiments I did with a TinyTrak III on an HF mobile 
> (FT-100 into a ATAS-100 screwdriver) about two years ago, nearly twice 
> as many posits were successfully received using Mic-E compared to the 
> standard APRS format for positions.
>
> While you may be able to guess at the content of a garbled text 
> message, I don't know how you would be able to guess at the missing 
> digits of a mangled position report.  (Unless they happen to be the 
> least significant decimal minutes values -- then the rest of the 
> digits might still be useful.)

Good reasoning for Bob's suggestion of Grid Square, it's humanly 
readable, only 6 characters so across 2 or 3 garbled receptions a person 
can make sens of it.  It's short enough to improve reception chances.  
The only drawback would be if you're trying to get truly detailed 
positions from it, then Mic-E makes more sense for tracking purposes.

Chris - If you're following this, it might be good to include both Mic-E 
and Grid Square in the beacon format options when you add GPS support.  
I'm adding it to my ToDo list for APRSISCE/32.

Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32




More information about the aprssig mailing list