43
8. PACKET OPERATION
[APRS Operation]
Boot up the PC and open the APRS software. Tune to the APRS system frequency.
Press FUNC key and while F icon is on press SQL key to enter to the data (APRS) mode. Repeat
the same sequence to exit.
[
] appears on the LCD display when the unit is in data (APRS) mode
The PC monitor will display the initial menu of TNC when it enters the APRS mode.
• Set the packet speed in command mode (cmd:). I.e.
cmd:HB 1200 and 9600
• Register your call sign
cmd:MY xxxxxx
• Set the speed on GPS port
cmd:GB4800
• Set the automatic transmission time separation
cmd:LOC E 3
• Set the monitoring header option OFF
cmd:LTMH OFF
• The transceiver will start transmitting automatically when data is received from the GPS re-
ceiver. Refer to the command chart and EJ-41U instruction manual for more details.
Note:
Set the transceiver and GPS receiver as far away from each other as possible to minimize pos-
sible interference.
[SET UP]
Please refer to the previous chapter for the set up and installation of the EJ-41U unit, TNC and PC.
See below for the connection of a GPS receiver. It requires a 3.5mm stereo plug to connect to the
DATA Terminal on the radio's front panel. See the chart for plug connections. Program the EJ-41U
by using commands from the PC in the same way as in the packet mode.
The PC can be removed from the transceiver once the EJ-41U is configured. EJ-41U will hold the
settings in memory. Repeat configuration only when it is necessary.
DSUB-9 cable
GPS receiver
Personal Computer
DATA IN
terminal
3.5 mm
3-conductor plug
RXD (To TXD of GPS receiver)
+B (To power of GPS receiver) Note (1)
Note 1: When the transceiver is set to the PACKET mode, a power output of +4.5V (max. 200mA) is
supplied by the transceiver, which can be used to power the GPS receiver.
IMPORTANT: Please always turn off the GPS receiver or disconnect the GPS cable from the DATA IN
terminal before turning off the radio. Otherwise you may risk resetting the CPU on the
EJ-41U.