JRC JLN-720, Instruction Manual

Page: 90 / 134

Chapter 5 Installation Method 5-4
Strictly observe the following instructions when installing the GPS compass sensor on a tiltable mast.
• Make sure that no abnormal vibration or impact is generated.
• When the mast is tilted, suspend the use of the GPS compass sensor since the sensor cannot
function normally.
• Make sure that no positional difference occurs as a result of tilting the mast.
Install the GPS compass sensor in a place free from any barrier so that the sensor can directly receive
radio waves from the satellite without any interferences of radio waves from the ambient environment
or re-reflection.
Install the GPS compass sensor in a place that complies with the following criteria as much as possible.
• Place of high visibility that can receive signals uniformly from the satellites in the sky
• Place at the sufficient distance from any high output transmission antennas
• Place outside of the radar beam
• Place at the distance of 5m or more from the INMARSAT antenna and outside of the beam
• Place at the distance of 3m or more from the VHF, MF/HF, and azimuth detector
• Place at the distance of 1m or more from the magnetic compass sensor
• Place at the distance of 3m or more from the amateur radio device antenna
If an ideal location cannot be selected easily and some compromise is necessary, initially install the
GPS compass sensor and fix the sensor after carrying out tests as to whether specified performance
can be obtained. Installation of the GPS compass sensor in an unsuitable place causes deterioration of
accuracy, resulting in possible accidents.
INMARSAT antenna radome
Radar antenna
Provide a distance of 5m or more from the INMARSAT
antenna. Do not place inside of the beam.
Must not be blocked by the mast.
(Provide a distance of 2m or more)
Install in the place that
provides adequate visibility
of the sky above the GPS
compass sensor and the
surrounding environment.
Provide a distance of 2m or more from the radar antenna.
When the radar antenna is too close, the accuracy may deteriorate due to the influence of multi-path signals.
Install the sensor above or below the beam as much as possible. Do not install inside of the beam.