DFF3 w Chirp ducer. What frequencies you choose?

Moonzy1

Furuno Super Fan
Will be running a DFF3 to an R-509LH

What low and high frequencies do you guys use for your different situations?
Say for Tuna? or Deep dropping for Swords?
 
Moonzy1,
I personally don't see any reason to change the frequencies.
38Khz for the LF and 200Khz for the HF side. While you could use 130Khz for the HF side it is still a very narrow beam width which is good for layer detection.

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