JRC JMA-3300 Series Installation Manual page 13

Fig. 2.1-5 Ensuring view angle
 Magnetron which has strong magnetic force is included in the scanner. Install the
scanner at least 3 meters away from nautical instruments including magnetic
compasses and chronometers.
* If there is a concern that structural objects existing within the vertical beam width
may generate false images, equip the structural objects with a radio wave absorber.
(There are two types of absorbers: broadband type having no specific resonant
frequency and narrowband type which can absorb a band with a specific frequency.
Use those where applicable.) Furthermore, it is effective to install a metal reflector,
which reflects radio waves upwardly, between the scanner and a structural object so
that the radar's radio wave will not directly come in contact with the structural object.
Reference:
 Because most radio wave absorbers have poor durability, some must be replaced
every year.
When installing a reflector, the area to the rear of the reflector becomes a blind sector.
Therefore, minimize the size of the reflector.
 The above procedures for selecting an scanner installation position are described
based on the radar's scanner. Comprehensively select the scanner position by
considering other scanners' installation procedure manual, hull's structure, strength of
the selected position, and vibration.
 Confirmation during test run
If the scanner vibrates a lot during test run, try to reduce or prevent vibration by
reinforcing the scanner mount base or using wire stays attached to the radar mast.
Chapter 2 INSTALLATION OF THE SCANNER
2.1 SELECTING THE INSTALLATION POSITION
2
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