[aprssig] APRStt Voice Channel outside the box

Rod Padmore rodpadmore at ns.sympatico.ca
Fri Oct 10 19:36:10 EDT 2008

I understand that when all applicable costs including various mundane 
expenses such as gas, motels, meals are tallied, it would cost a minimum of 
+/-$300 per repeater to add APRStt hardware, which, if true, makes APRStt 
virtually unattainable by the vast majority of hams. Is this essentially 
true and doesn't this make APRStt an  unrealistic concept, at least on the 
universal scale? 73 de Rod.

Original Message ----- 
From: "Robert Bruninga" <bruninga at usna.edu>
To: "'TAPR APRS Mailing List'" <aprssig at lists.tapr.org>
Sent: Friday, October 10, 2008 6:33 PM
Subject: [aprssig] APRStt Voice Channel outside the box

>I think people still miss the point of APRStt.
> They are thinking inside a DTMF box.
> Quite conversly, what users of APRStt (the other 95% of your
> club) will experience mostly has nothing to do with DTMF.  They
> simply tune into the APRStt channel and "listen" to APRS
> information in the immediate local area.  For example at a
> marathon where the lead vehicle has the call LEAD you will hear
> once a minute:
> "LEAD is 4.5 miles northeast of FINISH"  or
> "TAIL is 3.5 miles south of START"  or
> "W1VIP is .1 mile west of EOC"
> And you will never hear a LAT/LONG.  Positions are reported as a
> distance in a direction from the reference point.  The reference
> point defaults to the APRStt gateway location, but the sysop, or
> any APRStt user can change the reference point to anything else
> in APRS by simple command.. such as "from the repeater" or "from
> downtown" or "from FINISH", or from any other APRS station.
> With this powerful technique, it is very easy to visualize the
> tactical situation.
> Remember, with only a few key presses such as QNM APRStt will
> respond (by voice) with the nearest MOBILE to you...  Or QNW
> will be the nearest Weather to you... Etc..
> In a general purpose community APRStt for your club,  here are
> some examples of some of the unsolicited information that they
> might hear (if enabled):
> - An APRS mobiles voice FREQ  if he has it in his beacon
> - the local recommended voice freq object for travelers
> - the location and speed of some special stations.
>  A) Any TH-D7 that selects the  TRIANGLE ICON
>  B) Any D700 or APRS mobile using the "/n" ICON
>  C) Any one station enabled by the APRStt sysop or DTMF user
> - the location of any new CALL that comes into the area
> - the AZ & EL & Frequency of any satellite in view
> - the TRAFFIC Speed past any TRAFFIC choke point...
> So, think outside of the DTMF box!  APRStt is more about letting
> the other members of your club or community "receive"(hear)
> local APRS information of immediate interest than it is about
> entering anything in DTMF.
> Imagine the possiblities for your next event (for both the voice
> information) and for the remote data entry by anyone with an HT
> or for just providing local info of value to voice mobiles on a
> routine basis when you cannot raise anyone on the local
> repeater.
> The info on the original APRS Traffic monitoring system is on:
> www.aprs.org/traffic/traffic.txt
> And APRStt is on www.aprs.org/aprstt.html
> Bob, WB4APR
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