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[aprssig] APRS "text messaging" over long distances

Larry Cerney lcerney at viawest.net
Sun Oct 9 00:22:04 UTC 2005


Ian,

Repeater, no, but your messages are getting to an I-gate and being
transferred to TX to an I-gate there.  That I-gate is transmitting your
message back out via RF to K5LTC-9 which is local to that Igate.  The
process is reversed and his messages come back through your local I-gate.

This APRS messaging stuff is a little short of magic. Just like Albert
Einstein said many years ago.

"The wireless telegraph is not difficult to understand. The ordinary
telegraph is like a very long cat. You pull the tail in New York, and
it meows in Los Angeles. The wireless is the same, only without the
cat." 
-Albert Einstein (1879-1955)

73...
Larry
K0ANI


-----Original Message-----
From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
On Behalf Of Ian
Sent: Saturday, October 08, 2005 5:33 PM
To: 'TAPR APRS Mailing List'
Subject: [aprssig] APRS "text messaging" over long distances

Someone smarter than me (that should be most people on this list) please
tell me how this happens.  I am on top of Mt. Greylock in western MA in my
car with a TM-D700A running WIDE2-2 and K5LTC-9 is near Dallas TX running
same setup and path in his car and we are text messaging each other in near
real-time, and getting ACKs back.  I thought WIDE2-2 was suppose to keep
things rather "local" and this is well over a 1000 miles.  Are digipeaters
keeping track of our locations and overriding paths when a message is sent?

TIA, Ian N8IK-9




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