2-1 
2.1  SELECTING THE INSTALLATION 
POSITION 
 
1)  Physical selection criteria   
 
•  Install the antenna at the center of the mast on the keel line. 
 
•  If the antenna cannot be installed at the above position for some reason, the amount of 
deviation must be minimized.    And, reinforce the mount base and the platform and take 
precautions to protect the antenna from vibration and impact at the installation position. 
 
•  To avoid the radiating section coming in contact with other installed objects while it is 
rotating, ensure that there is at least 200 millimeters from the swing circle (turning radius) to 
other installed objects (Fig.1).    The swing circle of the JMA-5300MK2 radar's antenna is as 
shown in Table 1. 
 
 
Fig.1 Installation of antenna 
 
 
 
Table 1  Swing circle 
RADAR model  Antenna model (length) Swing circle 
JMA-5312-6/6HS  NKE-2103-6/6HS (6 feet) 
1910mm 
JMA-5322-6HS NKE-2254-6HS (6 feet) 
JMA-5322-7 NKE-2254-7 (7 feet) 2270mm 
JMA-5322-9 NKE-2254-9 (9 feet) 2825mm 
JMA-5332-12 NKE-1130 (12 feet) 4000mm 
min-height 
必要最小高さ 
min-offset 
オフセット最小 
Over 200mm 
200mm 以上 
reinforcing member 
補強材