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[aprssig] Re: Tracker Smart Pathing: user types, alternatives

William McKeehan mckeehan at mckeehan.homeip.net
Fri Mar 24 15:20:14 UTC 2006

See my comments below.

On Fri, March 24, 2006 9:57 am, Robert Bruninga said:
>>>> mckeehan at mckeehan.homeip.net 03/23/06 10:11 PM >>>
>> AND, ideally, I would like to have my location
>>sent at a faster rate if I don't hit a digi with a
>>wait at least x seconds (like 30-60) setting.
> This has to be done carefully.  Park next to a
> 7/11 with a strgon birdie from its computer and
> your tracker never hears its own digipeats.  It
> ups its rate to HIGH andyet you are parked.
> All it takes is one car per day to get into this
> situation and we end up with more QRM instead
> of less.  I have always thought that APRS
> transmitters should be aware of whether they
> are being digipeated or not, but PLEASE make
> sure any system that goes to higer rates has
> all kinds of safeguards!

I agree - adding safeguards would be a wise thing to do.

> Having automatic HIGH rates when not-heard
> is a guaranteed nuclear melt down scenario.
> SOmething blocks the main digi for a few minutes.
> All the smart mobiles then up their rate.  Still
> no success, so they up it higher.  WHen the
> digi does start working again, all it hears is
> 100% collisions on the input.

I would suggest a single high rate, not one that gets higher and higher. and
even the higher rate should be a reasonable beacon rate. If the reasonable
rate in your area is 2 minutes, then set this rate to 2 minutes; for my area,
1 minute is reasonable and would be what I would use. I agree that setting
this limit too low would be a bad thing, but setting it to a reasonable number
(i.e., your current fixed rate) and the calculation would in general reduce
the number of packets.

> What this system does is AUTOMATE the worst
> human condition we already have on APRS...
> THat is users who UP THEIR RATE to improve
> their success rate.  That me-first approach
> screws eveyone else.  And remember we
> (and the retorical you) are everyone  else...
>>Personally, I do not think the smart pathing is a good
>>idea... I think this would encourage people to use
>>longer paths.
> No, I think they would use less.  Now they can feel
> comfortable that they can live with a 1 hop rate
> all the time knowing that occasionally they will
> get out in a 2 hop area if needed.  Or 3 hops
> in some areas.
> Around here, (HIghest APRS density on the planet)
> I might make this Proportional Path setting:
>  1 min Path*:   none
>  2 min Path:   WIDE1-1                  1 hop
>  4 min Path:    none
>  8 min Path:    WIDE1-1,WIDE2-1  2  hops
> 16 min Path:   none
> 32 min Path:   none
> This would give me a good 2 minute rate but give
> me two 2-hop packets during most local trips to let
> buddies in the area see that I am on the air.
> de WB4APR,
> Bob
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William McKeehan
Internet: mckeehan at mckeehan.homeip.net

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