Ag Leader GPS 2100 Operators Manual - Manual (Page 57)

GPS 2000/2100 Troubleshooting
Ag Leader Technology
April 1998 5-3
Problem Cause Solution
When the lights on a vehicle,
specifically the combine, are
turned on, the signal-to-noise
ratio (SNR) value drops
considerably or differential
correction is lost completely. The load on the electrical
system has increased and
noise has been
introduced into the
system. Check the alternator to see whether it
is in satisfactory condition and
whether its capacity is correct for the
loads it must carry.
When the GPS 2000 is used on
a vehicle, such as a truck or
car, the SNR for the beacon
being used is very low or the
unit cannot lock on a
differential correction. Electrical noise generated
by the vehicles electrical
system.
•
Move the antenna to a location
that is not affected.
•
Use a line filter on main power to
unit.
The user has connected a
laptop computer or an HPC,
Hand-held Personal Computer,
running WinCE, but the
computer or HPC is not
receiving data from the GPS
2000/2100. When connected,
the GPS 2000/2100 display
may also stop updating
information. The transmit and receive
wires for the connected
units do not correspond
with each other. The unit needs a null modem cable.
This type of cable needs only pins 2,
3, and 5 connected.
When using the GPS
2000/2100 on a motorized
vehicle that is not moving:
•
Latitude (LAT) and
longitude (LON) readings
are erratic
•
The map on the GPS
2000/2100 screen or
external computer shows
erratic movement.
The unit is receiving
multipath signals, which
means that the signals the
unit receives are
bouncing off another
surface before reaching
the antenna, thus giving
erratic position
information. Start the vehicle moving or move
away from any surrounding vehicles
or metallic buildings that could be
providing a surface off which the
signal bounces.
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