[aprssig] Airborne Digis

[Wes Johnston, AI4PX]

I used to run proportional pathing on my wife's car.... updates simplex
every 30 seconds, 2 minutes out two hops.  THat way I knew to look busy when
she was close to getting home.  Of course the odd ball PL tone helped too.
;-)
Wes
---
We are learning a lot more about Chicago-style politics than I ever wanted.


On Fri, Sep 18, 2009 at 22:03, Robert Bruninga <bruninga at usna.edu> wrote:

> > The frequency agile MiroTraks currently cannot
> > be configured to alternate between different
> > frequencies, but that is a feature that
> > could be coded in the future.
>
> Here is a radical idea (option) for all frequency agile
> "trackers"...
>
> If they had Power control, they could also switch to a different
> "standard" frequency and key up at 1% power with maybe a carrier
> for 10 seconds after a 144.39 packet before shutting down.  This
> could help with DFing them..
>
> ...duh... I guess if they are transmitting their GPS info, then
> who needs to DF them?  But I'm sure there is a useful idea in
> here somewhere.
>
> One person a long time ago proposed a "proportional powering"
> algorithm.  The Tracker would transmit once evey (lets say) 4
> minutes at 10 watts, then inbetween at 2 minutes would transmit
> at 1 watt, and then every 1 minute at 0.1 Watt, and every 30
> seconds at 0.01 watt and so forth.
>
> Thus, for close in, you can find it fast.  But further out it
> puts out less and less QRM.  His proposal was actually for
> aircraft avoidance where line-of-sight performance makes for
> consistent range performance... But close in for colision
> avoidance you need the data FAST!
>
> Bob, Wb4APR
>
>
>
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