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 canmanually 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 arethe strongest on the screen.5. Select Back to close the tune frequency slider bar, or6. Select Ok to set the tune frequency to automatic.17.11 CHIRP sonar module frequencycontrolsThe frequency of the sonar determines the width of the sonarbeam, the depth to which the signals will penetrate and theresolution of the imageThe frequencies supported depend upon the sonar module andtransducer in use on your system:• Lower frequencies produce a wider sonar beam and penetratethe water well. A lower frequency provides a lower resolutionimage that may not be as good at detecting small fish. Uselower frequencies if you require a large coverage beneathyour vessel or if you are in deep water.• Higher frequencies produce narrower beam and produce ahigh resolution image. They are most useful in shallowerwater (up to 1000 ft) and at higher speeds.The options available (dependant upon connected sonar moduleand transducer ) are :• Auto. When operating in automatic the system will select thefrequency automatically to suit your transducer and operatingconditions.• 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 asa non-CHIRP sonar module.Setting the fishfinder frequency (CHIRPsonar module)With the Frequency settings menu options you can configureone 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 connectedto a CHIRP sonar module.12D12573-11. Non-CHIRP modes2. CHIRP modes.190 New a Series / New c Series / New e Series
