On Mon, 11 Aug 2008, Jim Tolbert wrote:
Has anyone determined the practical limit on the number of trackers that can be tracked at one time? It seems that the gating point would be the transmission. Is that correct? Therefore, could you have multiple receivers/tncs, each following a specific batch of trackers and each radio be a listed as a interface in Xastir? What is the length of the transmission with a tracker2? For tracking people that are walking, have people found it better to use a timed transmission ( once a minute or every 30 seconds, etc.) or can smartbeaconing be set up to advantage?
There are more variables yet: *) Tracked in what manner? Received all transmissions for each tracker? This is beyond the typical ham APRS network setup, which depends on redundancy to get a "reasonable" picture of activity. *) What network infrastructure is available, and what other trackers are running around that you're not interested in tracking? Digipeaters, other trackers, and home stations will add more time delays and collisions into the mix. *) Tracker2 transmission length: Depends on extra data you've selected to transmit, comment field lengths, and whether you're sending standard or compressed packets. Also depends on your TXDelay setting. *) Are you relying on assigned time slots for each tracker, or randome transmission times? With assigned time slots you can theoretically get more posits out for more trackers, but keep the digipeater times in mind as well. *) I find it good to set timed transmissions for foot troops, say every 3 or 5 minutes. Set SmartBeaconing for mobiles. *) Yes, you can use multiple frequencies/TNC's and hook them all into Xastir to increase the quantity of local RF objects tracked. -- Curt, WE7U. archer at eskimo dot com http://www.eskimo.com/~archer Lotto: A tax on people who are bad at math. - unknown Windows: Microsoft's tax on computer illiterates. - WE7U. The world DOES revolve around me: I picked the coordinate system!" _______________________________________________ Xastir mailing list [email protected] http://lists.xastir.org/cgi-bin/mailman/listinfo/xastir
