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[aprssig] Now - A New 6m tracker proposal

Robert Bruninga bruninga at usna.edu
Sun Nov 27 22:32:45 UTC 2005


Actually, Jim was right to bring up the 800 Lb gorrilla
in the back of the room (skywave) that would really
make a mess of a single frequency local alternate
APRS frequency.  So lets go back to the original 6m 
proposed band which was the start of this thread.

>Updated design goals for a 6m APRS black box tracker:
> >
> > 1) Xtal controlled 25W tracker on 6 meters
> > 2) Operates same AFSK 1200 baud as 2m
> > 3) Could use  modified CB whips
> > 4) XTAL RX at digipeater should also be simple kit
> * 5) Tracker PIC processor INTERROGATES other
> *     VOICE radios in the car and includes the present
> *     OPERATING frequency in the position report.
> * 7) Posit should be the extremely short Mic-E format
> * 8) PIC should do automatic time-slot assignment
>       (1-to-225) according to the sum of the last 3 
> *     bytes of the call plus the SSID.
* *  9) Use of time slotting avoids the need for a 
* *      CSMA receiver in the tracker.

de WB4APR





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