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61
AUTOMATIC PACKET/ POSITION REPORTING SYSTEM
The Automatic Packet/ Position Reporting System
(APRS
) is a software program and registered
trademark of Bob Bruninga, WB4APR. He has made
packet communications much more exciting than before.
This program allows you to track mobile stations on a
map which you recall on a computer screen. Imagine
seeing one mobile station moving on the map which can
be scaled from .5 to 2000 miles. You also may be
tracked on the computer screen of another station.
Stations to be tracked must transmit beacons at certain
intervals. To track other stations, you usually need a
computer running the APRS, a transceiver, and a TNC.
To have them track you, you also need a GPS receiver.
It receives signals from the satellites to inform you of
your current geographical position. GPS stands for
Global Positioning System. The APRS interprets the
National Marine Electronics Association (NMEA) data
strings coming from the GPS receiver. For further
information, consult Internet Web pages relating to the
APRS. You may use one of the Internet search engines
to find correct URLs.
This transceiver includes a TNC and a program for
dealing with data formats supported by the APRS. Its
display shows information each time correct APRS data
is received; you do not need a computer. It also allows
you to manually enter position data (latitude/ longitude)
to transmit; use this function if you do not have a GPS
receiver. Besides position data this transceiver can
receive or transmit the following information:
1
Receive only
2
Can be transmitted only when using a GPS receiver.
This transceiver has a PC jack and GPS jack to connect
with a personal computer and a GPS receiver. This
manual, however, does not describe APRS
communications which require these equipment.
Note:
◆
Turn OFF the transceiver power before making the connections.
◆
The GPS jack also accepts a 2.5 mm (1/10") 3-conductor plug. You
may use the provided cable {page 1} to modify the cable end of your
GPS receiver. The connection of each conductor (TXD/ RXD/ GND)
is the same as the plug on the PG-4W {page 53}.
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GPS receiver
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PG-4W
TH-D7 E 61 APRS 98.12.4, 0:13 PM61