JRC JFS-280, Instruction Manual

Page: 146 / 328

5 Adjusting How Images Appear 5-32
5
5.2.5 Settings for the Image SW Function
Turning the [IMAGE] knob registers a setting between A and E.
Settings A through E change the internal settings values, as seen in the following table.
Refer to the following table when using this equipment.
Echoes
SW
Assumed use
(Assumed
speed)
STC
LEVEL
(Assumed
range of
use)
Pulse
Length
(Long/short)
Clutter
(Strong/
medium/
weak)
Interference
(Strong/
medium/
weak)
AGC
MODE
TVG
Mid/Far
A50 Standard/
normal search
7.0
(700 to
300)
20
(Long)
3
(Medium)
2
(Weak)
RCG 20/30
B50 Sardines,
mackerel, etc.
Strong echoes
indicate schools
9.0
(1000 to
500)
20
(Long)
4
(Strong)
2
(Weak)
RCG 30/30
C50 Squids, sauries,
etc.
Wide, weak
echoes
3.0
(400 to
200)
20
(Long)
2
(Medium)
2
(Weak)
RCG 20/30
D50 You want to
move away
from the sea
floor
Echoes from
bottom fish
7.0
(600 to
300)
3
(Short)
3
(Medium)
2
(Weak)
RCG 20/30
E50 Bonito, tuna,
etc.
Echoes from
fast moving
objects
7.0
(600 to
300)
20
(Long)
3
(Medium)
4
(Medium)
RCG 20/30
A50: Standard setting value for finding fish.
B50: Setting for searching long distances for large schools of fish.
C50: Setting to enhance objects repeatedly captured from amongst weak echoes.
D50: Setting to raise resolution for directional distance.
E50: Setting for searching medium distances for school of fish at low ship speeds.
Function of the Image SW
Turning the [IMAGE] knob clockwise scrolls through the following figures in the order of
"A
→
B
→
C
→
D
→
E
→
A". Likewise, turning it counterclockwise scrolls in the order
of "A
→
E
→
D
→
C
→
B
→
A".