Sonar Operation; Chirp - Lowrance HOOK-4 Operation Manual

Sonar operation

This unit supports two types of sonar:
Conventional and Downscan.
The features described in this section are for
conventional sonar. Refer to the Downscan section
for information on Downscan features.

CHIRP

A CHIRP (Compressed High Intensity Radar
Pulse) transducer transmits a modulated pulse
of multiple frequencies within the bandwidth
Sonar Operation | HOOK series
of the selected transducer type. This results in
better image quality, better target separation and
greater depth penetration.
This unit supports High CHIRP, Medium CHIRP
and Low CHIRP, depending on the transducer.
CHIRP can be used with Lowrance conventional
sonar transducers.
• 50/200 kHz (Low/High CHIRP)
• 83/200 kHz (Medium/High CHIRP)
To use CHIRP, select the desired CHIRP frequency
from the Frequency menu.
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