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Understanding CHIRP

Traditional sounders operate at discrete frequencies such as 50kHz and 200kHz.

They produce short, high-power pulses which limit the energy entering the water column.

CHIRP technology increases the energy on the target and enhances both resolution and depth range.


1. CHIRP transducers transmit over a wide range of frequencies, not just one or two distinct frequencies.

2. The green line shows the wide range of frequencies used when compared to a conventional 200khz model.

3. Instead of a single 'ping', a CHIRP transducer outputs energy across the spectrum.

4. The sounder or fishfinder has to be able to process a CHIRP signal.

5. Pattern matching takes place in software within the sounder or fishfinder.

6. Comparison with the stored signal makes it easier to eliminate noise in the signal, giving clearer target imaging.

7. CHIRP sonar modules and fishfinders are available from many manufacturers.

8. CHIRP transducers are available with the same mounting options as conventional transducers, and often use the same brackets and housings for simplicity of installation.