Furuno 1715 - Scanner Unit Circuit Overview

1.3 Scanner unit
6
1.3 Scanner unit
In the scanner unit, the TX trigger from the display unit is modulated to use it for triggering the
magnetron. The received echo is fed to the MIC and down-converted to 60 MHz IF signal.
Auto-gain and auto-STC circuits are not in the scanner unit, but in the display unit.
Fig.1-4 Block Diagram of Scanner Unit
Display
unit
Trigger
Interface
Auto Gain
Auto STC
Auto Tune
Communication
Motor Drive
INT Board
Magnetron
Ship’s
mains
Tune
Power Supply
MD Board
Modulator
COM
Video
IF AMP
Tune
Antenna
Circulator
IF Board
MIC
RU-9458B
(U801)