Overview; Simplified Block Diagram; Chapter 2. Block Description - Furuno FR-1505 MARK-3 Series Service Manual

Chapter 2. BLOCK DESCRIPTION

2.1 Overview

Outline
Figure 2.1 Simplified block diagram
TX
The trigger pulse from the SPU (Processor) Board is delivered to the MODULATOR Board
which outputs the signal to oscillate the magnetron, and then radar wave is emitted from the
radiator.
RX
The 9.4 GHz echo signal received by the antenna is converted to 60 MHz signal by the MIC,
amplified by IF Amplifier, and fed to the SPU (Processor) Board as a video signal. It is digitally
processed and then displayed on the CRT. The SPU Board contains a video amplifier.
Auto Plotter (optional)
The following signals are applied from the SPU board to the ARP-10/17 Board: Heading,
Bearing pulse, Video, Trigger, Bearing in AD format, and Ship's speed (contact closure or
NMEA 0183). Target acquision and tracking are performed on the ARP Board. Target data,
target position, CPA, TCPA, Speed, and Course, are displayed on the screen.
Plotter (optional)
Data such as latitude and longitude in NMEA format is delivered from the SPU Board to the RP
Board. Plotter data generated on the RP Board is output to the SPU Board and processed to
display them on the screen. The plotter menu is generated on the SPU Board.
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