Overview; Scanner Unit - JRC JMA-5212-4/6 Service Manual

1.1. Overview

This equipment is marine radar equipment satisfying the IMO standard. The radar
equipment consists of a scanner unit that generates transmitting signals, transmits and
receives radio waves, and amplifies receiving signals, and a display system that displays
radar images after removing unwanted radio wave from the radar signals.
The radar equipment with which a magnetron tube is used as the transmitting tube
transmits 9.4 GHz (X band) pulse-modulated waves.
In addition to the basic radar functions, the radar equipment has functions for safe
navigation such as a radar trail display function, target tracking function
information display function
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The function is optional for radar equipment (not an IMO radar) which is designed for
fishing boats.

1.2. Scanner Unit

The scanner unit is an antenna that transmits a radar
signal into space, and sends the radar signal reflected
from a target into the equipment. The horizontal antenna
beam width is small for identifying the target bearing, and
the scanner unit has a rotating mechanism for detection in
the entire surrounding area.
Two types of scanner units are provided for this
equipment, and their usage is as follows:
X band (10 kW) scanner unit: Compact and light
weight
X band (25 kW) scanner unit: High resolution, and high sensitivity
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.
Figure 1.1 X-10kW scanner unit
Figure 1.2 X-25 kW scanner unit
1-1
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, and AIS