Step 3. Is The Base Gps Receiver Set To Function As Rtk Base; Step 4. Is Receiver Set To Output Rtk Base Data On Port B; Step 5. Base Coordinates Entered Correctly Into Base Receiver - ashtech Z-Xtreme System Manual

Step 3. Is the Base GPS Receiver Set to Function as RTK Base?

If the base receiver is not set to RTK base mode, it will not send raw data to the
RS232 port for transmission by the radio. Use the field application software or front
panel of the Z-Xtreme to determine if the receiver is set to RTK base mode.
Receiver not configured as RTK base
1. Set receiver to RTK base mode.
2. Using either the field application software or the front panel of the receiver,
set the base receiver to RTK base mode.
Receiver is configured as RTK base
Go to step 4 below.

Step 4. Is Receiver Set to Output RTK Base Data on Port B?

The port set in the GPS receiver for output of RTK base data must be the same port to
which the base radio is connected. The base radio should currently be connected to
the RS232 port labeled 'B' on the back of the Z-Xtreme. Use the field application soft-
ware or the front panel of the receiver to verify that port B is set as the output port for
RTK base data.
Receiver not set
1. Set the receiver to output RTK base data on port B.
2. Using either the field application software or the front panel of the receiver,
set the base receiver to output RTK base data on port B.
Receiver set
Go to step 5 below.

Step 5. Base coordinates entered correctly into base receiver?

The base GPS receiver compares the position it computes for it's location to the posi-
tion entered by the user as the base position. If the two sets of coordinates differ by
more than 500 meters, the base receiver will not output RTK base data. Use the field
application software or the front panel of the Z-Xtreme to verify the coordinates
entered for the base position.
76 Real-Time Kinematic Surveying