Furuno FAR-2107 Series Service Manual page 442

7.3.4 Signal processing
Signal processing is performed on the SPU board. The figure below shows the concept
of the processing sequence.
STC control done on the RFC board is performed on the basis of the control data from
the SPU board. The processing of Echo Average and Echo Trail requires ship's
heading/speed data or own ship position data. The ARPA requires ship's heading/speed
data at the minimum.
RFC p.c.b
STC DETECT
STC
STC CONT
Setting parameter
- MODEL
- STC RANGE
- SEA CONDITION
- ANT HIGHT
- NEAR/MID/FAR STC CARV
VIDEO CONTRAST
Heading/Speed data
or
Own Pos. data
Heading/Speed data
or
Own Pos. data
Fig. 7.3.9 Signal processing sequence
7-37
IF p.c.b
SPU p.c.b
AD CON
FTC(RAIN)
ARPA
QV
SEL
NOISE REJ
INT REJECT
TRAIL
ZOOM
presentation
7.3 Processor Unit (RPU-013)
Heading data
Speed data(BT/WT)