1. OPERATION
19
Freq. Choice:
You can register up to four dif-
ferent frequencies for a single transducer, fol-
lowing the procedure in "Freq. Control" in the
Sounder menu. Then, you select here the
high and low frequencies to use.
1. Select Freq. Choice and press the [EN-
TER] key. The choices available depend
on the transducers you have. The choices
below are for 200 kHz (high frequency)
and 50 kHz (low frequency).
2. Use
S
or
T
to select HF Freq or LF Freq
as appropriate and press the [ENTER]
key. The frequencies preset with Freq
Control are shown.
3. Use
S
or
T
to select applicable frequen-
cy and press the [ENTER] key. The pic-
ture for the frequency selected here is
shown on the display.
Freq Control:
Four different transducer fre-
quencies and frequency adjustment range
are automatically set at installation. However,
the range of frequency adjustment for each
frequency may be different depending on in-
stallation characteristics. For example, for a
200 kHz frequency transducer, the default fre-
quencies are 200 kHz, 196 kHz, 198 kHz and
204 kHz. If those frequencies are not suitable
for your use, you can change them. Further, in
case of a wide-bandwidth transducer, fre-
quencies may be chosen from the available
frequency range. This allows you to have mul-
tiple frequencies for a single transducer. For
example, if you have the transducer 82B-35R,
you can register frequencies between 66 kHz
and 109 kHz. The frequencies registered here
may be selected at Freq Choice in the Sound-
er menu.
Set transducer frequency keeping in mind
these considerations.
• Set frequency which is suitable for detect-
ing targeted fish.
• Shift frequency so as to reduce interfer-
ence.
• Lower frequency to increase detection
range.
• Raise frequency to improve resolution.
1. Choose Freq. Control and press the [EN-
TER] key. The contents of the setting win-
dow depend on your system
configuration. In the example below, a
200 kHz transducer is connected to the
HF terminal and a 50 kHz transducer is
connected to the LF terminal.
Transducer connected
to HF terminal
Transducer connected
to LF terminal
(1) 200 kHz trans. connected to HF terminal;
50 kHz trans. connected to LF terminal
Frequency shown
on HF display
Frequency shown
on LF display
Freq Choice
HF Freq
: 200.0kHz(HF Terminal)
LF Freq
: 50.0kHz(LF Terminal)
Freq Choice
HF Freq
: 200.0kHz(HF Terminal)
LF Freq
: 198.0kHz(HF Terminal)
(2) 200 kHz trans. connected to HF
terminal; no trans. connected to LF terminal
(3) 50 kHz trans. connected to LF terminal;
no trans. connected to HF terminal
Freq Choice
HF Freq
: 50.0kHz(LF Terminal)
LF Freq
: 49.4kHz(LF Terminal)
(1) Configuration
(2) Configuration
(3) Configuration
200.0kHz(HF Terminal)
196.0kHz(HF Terminal)
50.0kHz(LF Terminal)
51.0kHz(LF Terminal)
200.0kHz(HF Terminal)
196.0kHz(HF Terminal)
198.0kHz(LF Terminal)
204.0kHz(LF Terminal)
50.0kHz(HF Terminal)
49.0kHz(HF Terminal)
49.4kHz(LF Terminal)
51.0kHz(LF Terminal)
195.5kHz
194.0kHz
206.0kHz
