Raymarine DS500 Specifications download pdf (Page 60)

50 DS400 and DS500 Digital Fishfinders

• LOW minimizes rejection of potential interference. Use this setting when

you want to be sure that what has been removed are really false returns.

• HIGH rejects much more interference but can potentially weaken the

appearance of actual targets.

The default setting is AUTOMATIC.

Second Echo Rejection

A so-called “second echo” can caused by the sonar signal returning from the

bottom, reflecting off the water’s surface, bouncing off the bottom again and

returning. This option helps eliminate identifying a false bottom.

Select from the following:

• OFF, which offers no rejection

• LOW, which provides minimal rejection by slightly reducing the ping rate

• HIGH, which offers the greatest signal rejection by decreasing the ping

rate further

The default setting is LOW. Only set this setting to HIGH if you notice second

echoes appear on your display.

Power

The Power setting provides adjustment of the transducer signal. Select from

the following:

• AUTOMATIC, in which the sounder automatically determines the optimal

power setting based on the current depth, speed, and (bottom) signal

strength

• MANUAL, in which the power is increased or decreased in 10% incre-

ments.

The default setting is AUTOMATIC.

Max. Ping Rate

The setting determines the maximum number of sonar pulses, or pings, the

transducer emits per second. You can set Max Ping Rate anywhere between

5–30, in increments of 1.

The default setting is 30 pings per second, the maximum. You can reduce this

number down to a minimum of 5 pings per second, if necessary, to help

reduce second echoes.

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Raymarine DS500 Specifications Page 60