Javad Prego Operator's Manual page 122

TR O U B L E S H O O T I N G
5
Receiver Problems
The receiver cannot obtain Code Differential and/or RTK solutions.
Causes
Incorrect Base
coordinates entered.
The receiver is not
configured as a Base or
Rover.
The corresponding
receiver options may
be disabled or expired.
There are not enough
common satellites. In
order to obtain a fixed
solution, the Base and
Rover should track at
least five common
satellites.
Poor satellite geometry
(PDOP/GDOP values
are too high).
The elevation mask is
above 15 degrees.
5-4 Prego Operator's Manual
Solutions
Specify the correct coordinates for the Base
station using PCView or other suitable
field data collection software.
• If the receiver should function as a Base,
ensure it has the proper configuration.
See "Measuring with the Prego" on
page 3-6 for further information.
• If the receiver should function as a
Rover, ensure it has the proper
configuration. See "Measuring with the
Prego" on page 3-6 for further
information.
• See "Checking Options" on page 4-15
for details on how to check current
options.
• Enable or prolong the validity of the
corresponding receiver options by
ordering a new OAF with the desired
options activated.
• Ensure that both the Rover and Base
receivers use the same, and updated,
almanac. See "Collecting Almanacs" on
page 2-33.
• Check the elevation masks of the Rover
and Base receivers; they should be the
same. See page 2-8 for information on
setting the elevation mask.
Conduct your measuring when PDOP
values are low.
• Lower the elevation mask.
• See page 2-8 for information on setting
the elevation mask.
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