Frequency Selection - Interphase Advantage User Manual

Frequency Selection

The operating frequency of the Advantage can be
selected for 200 kHz, 50 kHz or a combination of both at
the same time. In general, the 200 kHz frequency will
give better resolution for marking bottom structure, but
the 50 kHz will cover a wider area and penetrate the water
to much greater depths than the 200 kHz frequency.
Frequency Selection
To select or change the operating frequency of the
Advantage, press the soft key labeled "FREQ" from the
Control Center Main Menu, as shown at right.
When the "FREQ" softkey is pressed, a Pop-Up
Frequency Selection Window will temporarily appear as
shown at right. Use the large front panel knob to select
the operating frequency mode desired. The frequency
mode selected is shown in reverse video (white on black).
Notice that you can choose either;
1) Full Screen 200 kHz
2) Split Screen 50/200 kHz
3) Full Screen 50 kHz
4) Split Screen 200/50 kHz.
Notice that selection #2 and selection #4 above are
reversed - in #2, the 200 kHz frequency will appear on the
right side of the display and in #4, the 50 kHz frequency
will appear in the right side. This is important because
whichever frequency is on the right side of the display is
the "PRIMARY" frequency. When you choose to show
other split screen displays such as Zoom, Bottom Track,
Track Plot, etc., the primary frequency will remain in
view and the desired action (Zoom, Bottom Track, etc.)
will use this frequency - the primary frequency.
When the output power is at the desired level you can
remove the Pop-Up Power Adjustment Window by either:
1) Not touching the adjustment knob for
10 seconds, or
2) Pressing the "PWR" softkey, or
3) Pressing any other softkey.
The frequency setting is automatically saved whenever
the Pop-Up Frequency Menu disappears.
Frequency Selection
1) Press "FREQ. " Soft key to bring
up the Pop-Up Frequency Display
(as shown above).
2) Use large front panel knob to
adjust frequency to desired setting.
(In above example, frequency is set
for split screen 50/200 operation
with 50 kHz on left and 200 kHz on
the right side of display. 200 kHz
will be the primary frequency.)
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