Chirp Sonar Module Frequency Controls - Raymarine a series Installation And Operation Instructions Manual

The graph above depicts an example of the fine tuning (from
—50% to +50%) available when the frequency is set to 200 kHz.
Tuning the fishfinder frequency (non-CHIRP sonar module)
When connected to a non-CHIRP sonar module you can
manually tune the fishfinder frequency.
From the fishfinder application:
1. select Menu.
2. Select Frequency settings.
3. Select either Tune Freq 1 or Tune Freq 2 as required.
The Tune Frequency slider bar is displayed:
4. Adjust the slider to the required value.
the optimum frequency will be when the echo returns are
the strongest on the screen.
5. Select Back to close the tune frequency slider bar, or
6. Select Ok to set the tune frequency to automatic.
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17.11 CHIRP sonar module frequency
controls
The frequency of the sonar determines the width of the sonar
beam, the depth to which the signals will penetrate and the
resolution of the image
The frequencies supported depend upon the sonar module and
transducer in use on your system:
• Lower frequencies produce a wider sonar beam and penetrate
the water well. A lower frequency provides a lower resolution
image that may not be as good at detecting small fish. Use
lower frequencies if you require a large coverage beneath
your vessel or if you are in deep water.
• Higher frequencies produce narrower beam and produce a
high resolution image. They are most useful in shallower
water (up to 1000 ft) and at higher speeds.
The options available (dependant upon connected sonar module
and transducer ) are :
• Auto. When operating in automatic the system will select the
frequency automatically to suit your transducer and operating
conditions.
• Low frequency (e.g. 50 kHz) (non-CHIRP mode).
• Medium frequency (e.g. 90 kHz) (non-CHIRP mode).
• High frequency (e.g. 160 kHz) (non-CHIRP mode).
• Low Chirp (e.g. 42 to 65 kHz) (CHIRP mode).
• Med Chirp (e.g. 85 to 135 kHz) (CHIRP mode).
• High Chirp (e.g.) 130 to 210 kHz) (CHIRP mode).
Note: If a CHIRP sonar module is connected to a (traditional)
non-CHIRP transducer the CHIRP sonar module operates as
a non-CHIRP sonar module.
Setting the fishfinder frequency (CHIRP
sonar module)
With the Frequency settings menu options you can configure
one or two frequencies for each of the four presets.
1. From the fishfinder application select Menu.
2. Select Frequency settings.
3. Select Freq 1 or Freq 2 as required.
4. Select the required frequency:
Example of Frequency setting menu when connected
to a CHIRP sonar module.
1. Non-CHIRP modes
2. CHIRP modes.
1
2
New a Series / New c Series / New e Series
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