[aprssig] Digital two-way Radio communication in emergency situations

Scott Miller scott at opentrac.org
Mon Sep 8 12:52:59 CDT 2014


On 9/8/2014 9:20 AM, Robert Bruninga wrote:
>> A new network ought to allow only users with... coordination
> capabilities.
>> You don't get to transmit without knowing the exact time... [slot]
>> The tricky part is coordinating slot reuse between overlapping digis...
>
> An easy fix for purpose built nets for special events is to eliminate that
> problem by using split freqs.  One for the trackers and the other for the
> digi outputs.  Just like we do here for local special events.  144.39 for
> digi outputs (so everyone can see everything and everyone) and +600 for
> tracker inputs.

That's not exactly what I meant... though for the Burning Man project I 
was working on slotted digis that would aggregate traffic over a 5 
second period and transmit everything within a dedicated 1-second digi slot.

The problem I'm talking about is if you have a digi acting as a channel 
access control authority and assigning slots to trackers.  You don't 
want the same slot on the same channel being used by different trackers 
in overlapping digi coverage areas.

Scott
N1VG



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