1. OPERATION
24
1.20.2
Tx/Rx menu
Tx Power:
Interference may appear on the
screen when an echo sounder having the
same frequency as your own is being operat-
ed in the vicinity of your vessel. In this case,
lower your Tx power and contact the vessel to
request them to reduce their Tx power. Tx
power is available in Off, Min, 1-10, and Auto.
Off
turns off transmission.
Min
sets minimum
Tx power.
Auto
automatically adjusts Tx pow-
er.
1-10
sets desired Tx power; the higher the
value the more the Tx power. When Tx power
is reduced (Off, Min, 1-9), the indication "P/R"
appears at the top of the display. Note that
Auto is automatically selected when Accu
Fish is active.
Tx Rate:
Changes pulse repetition rate, in 20
levels. Normally, the highest rate (20) is used.
When in shallow waters second reflection
echoes may appear between surface and ac-
tual bottom echo. In this case, lower the Tx
rate level.
Max
automatically changes the in-
terval and pulse length with depth.
S
activates
the ship's speed dependent mode, where the
TX rate changes automatically with ship's
speed. (Requires ship's speed input.)
Tx Pulse Edge (HF/LF):
Turn on to suppress
interference to other acoustic equipment (fish
finders, scanning sonars, etc.), your own and
others.
Tx Pulse (HF/LF):
Pulse width changes ac-
cording to range and shift values. When long
range detection is your objective select a long
pulse length. For better resolution, choose a
shorter pulse.
Short 1
raises the detection
resolution, however, detection range is short-
er (pulse length is about 1/4 of Std) than the
Std setting.
Short 2
raises the detection reso-
lution, however, detection range is shorter
(pulse length is about 1/2 of Std) than the Std
setting.
Std
is the standard pulse length, and
is suitable for general use.
Long
Increases
the detection range but lowers the resolution
(about 1/2 compared to the Std pulse length).
Manual
enables manual setting of pulse
length, at "Pulse Length."
Pulse Length (HF/LF):
Operative when Man-
ual is selected at Tx Pulse. A small value
gives better detection resolution, however de-
tection range is shorter. On the other hand, a
large value gives better detection range but
resolution is lower. The setting range is 0.05 -
5.0 (msec).
Rx Band (LF/HF):
Rx bandwidth is automati-
cally set according to Tx pulse length. Nor-
mally the
Std
position provides good
performance. If noise is a problem switch to
Narrow
. For better resolution, select
Wide
.
Target Echo:
Set fishing objective.
Normal
is
for general purpose fishing.
Surface
is for de-
tecting surface fish. Pulse repetition rate is
higher than "Normal" on the 1kW and 2kW
transducers that are programmed into the
menu.
Squid
detects squid and other individ-
ual fish. These items are automatically set: Tx
Pulse, Short 1; Echo Stretch, ON, and
Smoothing, Off.
Deep Sea
is the same as
Normal.
Max
