Frequency - Raymarine DS400X Owner's Handbook Manual

32

Frequency

The DS400/500X uses dual frequency sonar—50 kHz and 200 kHz—and
can be used in either auto or manual modes.
The DS400/500X can automatically select the appropriate frequency, based
on the current display range. As the depth increases while in Auto Frequency
mode, the fishfinder shifts from 200 kHz to 50 kHz. As the depth decreases,
the fishfinder switches from 50 kHz to 200 kHz.
You can select the transducer frequency for automatic or manual operation at
50 kHz, 200 kHz or both frequencies simultaneously.
AUTOMATIC enables the digital fishfinder to determine the optimum fre-
•
quency based on the current conditions.
200 kHz MAN fixes the frequency at 200kHz no matter what depth you are
•
viewing. This frequency is typically used for shallower water and a more
detailed view. When using this frequency, the transducer scans a nar-
rower area, but produces a more detailed view. The 200 kHz signal is
good for finding fish near the bottom or close together. It is better for use
in shallow water.
50 kHz MAN fixes the frequency at 50kHz no matter the depth. This fre-
•
quency is typically used for wide coverage and deep water. When using
this frequency, the transducer scans a wide area. The 50 kHz signal pene-
trates water well, so is good for use in deep water.
DUAL MAN displays separate screens for both 50 and 200kHz. The trans-
•
ducer can operate in both 50 kHz and 200 kHz frequencies at the same
time. If you choose dual frequency operation, the scrolling bottom dis-
play is split vertically; the left half shows the 200 kHz detailed view and
the right half shows the 50 kHz image.
The default setting is AUTOMATIC.
DS400X and DS500X Digital Fishfinders