Interphase Advantage User Manual page 7

benefit, and drawbacks. For example:
1) 50 kHz signals can penetrate to much deeper depths
than 200 kHz signals. Even with high power, 200
kHz signals usually can not reliably penetrate
beyond 1,200 feet while 50 kHz signals can easily
reach depths beyond 2,000 feet.
2) 200 kHz signals typically give much better
resolution and definition to bottom structure in the
shallower depths. If you see a return echo from the
200 kHz signal, you can be pretty sure the object
which caused the echo is almost directly beneath
your boat.
3) 50 kHz signals cover a much wider area (cone or
beam angle) than 200 kHz signals. This can be very
useful when searching for bait, bottom structure or
even when monitoring the depths or tracking
downrigger weights.
4) 200 kHz and 50 kHz signals react differently when
they strike underwater schools of bait and encounter
temperature inversion layers. With experience, you
can use the two different frequencies to better
understand and interpret underwater signals.
The Advantage allows you to view the water beneath your
boat with either a full screen 200 kHz view, a full screen 50
kHz view or a split screen dual frequency view. In the split
screen dual frequency view the Advantage alternately pulses
the transducer with each frequency and then displays the
returning echoes.
The Advantage's unique variable output power system allows
you to manually adjust for optimum power transmission in
either shallow or deep conditions. In shallower water you can
reduce the output power to help reduce screen clutter from
unwanted objects, while in deeper water the power can be
adjusted upwards to achieve outstanding depth penetration and
fish detection.
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