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DSM 132/132RS Receiver User Quide 89
Troubleshooting A
Interference
Strong magnetic fields
Strong magnetic fields have no effect
on GPS or satellite DGPS signals.
However, some computers and other
electric equipment radiate
electromagnetic energy that can
interfere with a GPS receiver.
If you suspect interference from a local magnetic
field, move the receiver away from, or turn off the
suspect electronics while observing the GPS
receiver’s number of satellites being tracked or
satellite’s signal-to-noise ratio.
FM 2-way radios
Transmitting FM 2-way radios can
interfere with OmniSTAR, Racal,
WAAS and GPS signal reception.
Make sure that there is at least 1 m (3 ft) between
the FM 2-way radio antenna and the receiver.
Engine Noise
An unshielded ignition system can
cause enough noise to block
reception of a beacon signal.
Use resistor spark plug wires on the ignition system
of the vessel.
An alternator can cause noise that
interferes with a beacon signal.
Use bypass capacitors, commonly available in
automotive stores for cleaning up interference to
CB and other radios. If the problem persists, shield
engine components with aluminum foil.
Relocate the antenna on the machine.
Determine the optimal antenna location by watching
the signal-to-noise ratio (SNR) value on the
AgRemote Home screen. When using a beacon
differential correction signal, aim for a value of 10 or
higher.
Note – Before replacing engine parts in an attempt to
solve this problem, make sure that the problem is not
caused by a computer or power source near the
receiver. Some office computers and their power
sources cause noise that is disruptive to the GPS and
satellite DGPS signals.
Receiver
Mounting location
The receiver is not picking up a clear
signal.
Mount the receiver on the centerline of the vehicle,
away from any sources of interference and with a
clear view of the sky (see page 27).
Problem / issue Possible solution