232
(2) Precautions to be observed when installing the scanner unit on a yacht
A yacht heels on the lee side when a wind with a certain level of force blows.
The following condition occurs if the heel angle exceeds 1/2 of the beam width:
•
On the windward side, the water surface lies outside the beam, weakening the
radio wave that is incident to the target on the water surface. Consequently,
the echo generated by this target is will hardly be visible on the radar screen.
Conversely, on the lee side:
•
Since the radio wave that is incident to the water surface is stronger, strong sea
clutter will develop. For yachts on which the heel is 1/2 or greater than the ver-
tical beam width (
θ
) , it is recommended that the scanner unit be installed on a
mounting base so that the scanner unit can be tilted on the left and right sides
according to the heel angle.
Beam width
θ
Heel angle
Φ
Radar scanner unit
Horizontal line
Wind
Содержание JMA-2343
Страница 1: ...船舶用レーダ装置 JMA 2343 2344 MARINE RADAR EQUIPMENT 取扱説明書 INSTRUCTION MANUAL ...
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Страница 17: ...J JM MA A 2 23 34 43 3 2 23 34 44 4 取 取扱 扱説 説明 明書 書 日本語版 ...
Страница 30: ...14 1 4 構造 第 1 1 図 NKE 249 空中線外形図 ...
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Страница 32: ...16 第 1 3 図 NCD 4170 指示機外形図 ...
Страница 115: ...99 9 2 3 装備ケーブルの接続 1 レドーム型空中線 NKE 249 ...
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Страница 117: ...101 2 回転型空中線 NKE 250 ...
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Страница 151: ...J JM MA A 2 23 34 43 3 2 23 34 44 4 I IN NS ST TR RU UC CT TI IO ON N M MA AN NU UA AL L English edition ...
Страница 163: ...147 1 4 Configuration Fig 1 1 OUTLINE DRAWING OF SCANNER UNIT NKE 249 ...
Страница 164: ...148 Fig 1 2 OUTLINE DRAWING OF SCANNER UNIT NKE 250 ...
Страница 165: ...149 Fig 1 3 OUTLINE DRAWING OF DISPLAY UNIT NCD 4170 ...
Страница 249: ...233 9 2 3 Connection of cables to be assembled 1 Radome scanner unit NKE 249 ...
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Страница 251: ...235 2 Rotary scanner unit NKE 250 ...
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