Scanner Unit - Furuno 1715 Service Manual

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.
INT Board
Interface
Auto Gain
Auto STC
Auto Tune
Communication
COM
Display
Motor Drive
unit
Trigger
Ship's
mains
Power Supply
IF Board
Video
Tune
MD Board
Fig.1-4 Block Diagram of Scanner Unit
6
Tune
IF AMP
Modulator
1.3 Scanner unit
MIC
RU-9458B
(U801)
Antenna
Circulator
Magnetron