Radar System Certificate - Furuno WR2120 Installation Manual

4) Survey antenna surroundings
Ensure no interference to any surrounding antenna (e.g.: Broadcast, mobile (cell) phone
station, radio, BS/CS, etc.) and no obstacles should be around the antenna.
Moreover, secure a service space of 1 m or more around the antenna. In addition, strong
reflections can damage the receiver if there are obstacles nearby.
5) Power supply requirements
Radar needs 100VAC (up to 240VAC), single phase 50/60Hz with GND. The minimum
electric current must be installed for voltage used, 100V is 10A, and 240V is 4.2A.
6) Telecommunication line and internet requirements
Use telecommunication line for transferring weather observation data and operating the radar
by remote. The minimum require continuous speed to transfer all data in real time is 8 Mbps
or faster. A wireless network may have enough speed for just operating the system but we
recommend you to use a fast speed network like a fiber optic network when possible.
7) Building/ground structure
The installed location of the radar must have proper load bearing resistance and durability to
support a tower or stand. However a structural plan from a professional architect and any
required permits may still be required for building or ground installation of the radar
tower/mount.
8) Human health considerations
Build the radar stand at least 2 meters high if the radar is installed where people have easy
access to radar. A sign board must also be placed at the entrance or ladder at radar access
point.
9) Heating and cooling system
Place where installed DPU may recommend having with air conditioner to keep the room
comfortable especially when put DPU into a rack/cabinet.
10) Pseudo echo
Set the sector blank to the obstacle direction nearby. When transmitting in the direction of the
obstacle, some pseudo echoes will be indicated due to reflections, therefore set the sector
blank until the pseudo echo disappear.
Cautions:
1> DO NOT look at the antenna closer than noted below while radar is in operation. This energy
can be extremely damaging to the human body, especially the eyes. Furthermore DO NOT
points the antenna at any individuals closer than noted below while transmitting.
2> As shown in Installation manual preface warnings (Table on page i, Radio Frequency
Radiation Hazard), the danger distance of transmit radio wave is set to 10 W/m
standard, therefore do not go closer than 9.1 m to the radar.
1.7.

Radar System Certificate

Most countries by law have specific certificates for operating radar as a radio station. The radar
frequency is in a shared radio spectrum with many other radio services, providing functions
ranging from air traffic control to amateur radio operations. Although the radio frequency spectrum
is not a physical resource, the use of a frequency at a given location usually precludes that same
frequency from being used by others in the same geographic area. This need to have exclusive
geographic use to prevent harmful interference has led to the current spectrum regulations and
established spectrum use rules. Such rules grant licenses for spectrum use, and partitioning of
spectrum for shared use between radio services.
These certifications are approved by the Ministry of Internal Affairs and Communications (Japan),
Federal Communications Commission (USA), or other agencies of the specific country. It is
important to apply when deciding the radar location because it will take time to get certification
approval. It sometimes takes up to a year.
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