Timing, Mbs, Ring Suppression - Furuno FAR-2107 Series Service Manual

4.4.2 TIMING, MBS, RING SUPPRESSION

INITIALIZE -> 2: ECHO -> 4, 5, 0
Timing control is executed on the SPU board, and MBS (40 dB attenuation) and ring
suppression (20 dB attenuation) control are executed by the IF board of the TR unit.
The adjusted data is saved on the SPU board.
Photo 4.4.4 Picture under the set condition
Photo 4.4.5 Timing has not been adjusted
Main bang of radius 5-7 mm
Photo 4.4.7 Proper timing adjustment, the
main bang appears near the
center
Timing not adjusted
4-14
Make the setting as follows
- RANGE: 0.125NM, S1 PULSE
- GAIN: 70
- SEA: 20-30
- RAIN: OFF
- EAV: OFF
Note: Operating range
- IR: OFF
- MBS: 0
Photo 4.4.6 Picture is absorbed due to too
much timing adjustment
Appearance of a slight amount of main
bang is desirable.
Erased by adjustment in RING
SUPPRESSION.
Photo 4.4.8 The main bang disappears
because of too much MBS adjustment.
Adjust MBS so that a slight amount of
main bang appear. When ring-shaped
echoes appear outside the main bang,
make adjustments in RING
SUPPRESSION.
Initialize Setting Initialize Setting Initialize Setting Initialize Setting
4.4
MBS: 0.21NM
Ring Suppression: 0.22NM
Picture is absorbed.