Raymarine gS Series, Инструкция по установке и эксплуатации, Страница: 112 / 208

sweep the transducer’s available frequency range in each
ping.
• High Chirp — CHIRP mode (e.g. 130 to 210 kHz) — No
fine-tuning is not needed as the CHIRP sonar module will
sweep the transducer’s available frequency range in each
ping.
With the CHIRP sonar module set to a non-CHIRP mode the
frequency can be fine tuned to adjust the frequency at which
the transducer is transmitting.
The graph below depicts fine-tuning of a CHIRP broadband
sonar frequency (from —50% to +50%).
Low High
S
e
n
s
it
iv
it
y
(d
B
)
Frequency
D12575-2
3
-50% +50%
1 2
1. Tuning range
2. Transducer characteristics
3. Operating (center) frequency
Fine-tuning the sonar frequency
When connected to a Traditional or Legacy sonar module or
when operating a CHIRP sonar module in non-CHIRP mode the
transmit frequency can be fine-tuned.
From the Fishfinder application:
1. Ensure that the channel frequency that you want to fine-tune
is displayed in the active Fishfinder pane.
2. Select Menu .
3. Select Set-up .
4. Select Sounder Set-up .
5. Select Tune Frequency .
The frequency adjust control is displayed.
6. Adjust the frequency until optimum results are achieved.
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gS Series