66
Reference Manual
00809-0100-4840, Rev CB
Section 5: Service and Troubleshooting
February 2015
Service and Troubleshooting
5.5.5 Setting the frequency (on the 3102/3105)
Screen display: F
Default: Auto
The frequency at which the transmitter operates is automatically chosen by the microprocessor
to ensure optimum signal size and performance.
“Auto” sets the frequency to obtain the best echo size and optimum performance. The actual
frequency being used by the transmitter can be viewed in diagnostics (see page 60).
The limits of operating frequency are a function of the intrinsic properties of the transmitter
itself, and may be set to operate at any frequency between
49 and 58 kHz.
The transmit frequency affects the quality of the echo being received, which may be used to
improve a poor echo or reduce the quality of a false echo.
Note
This menu option is in the engineering menu “Eng”. See “Accessing the engineering menu (on
the 3102/3105)” on page 62 or see Figure C-5 on page 106 for a map of the menu structure.
To change the frequency
1. After entering the “Eng” menu (see the note above), press the green button
repeatedly until “F” is indicated.
2. Press the blue button
to enter the frequency menu. The display indicates the present
frequency setting.
3. If this frequency is correct, press the red button
and then press the green button to
get to the next menu option. Otherwise, continue with step (4).
4. Press the blue button
to start the editing mode. The present frequency setting
flashes to indicate it can be edited.
5. Press the green button
repeatedly to scroll through available options (49 to 58 kHz).
(To restore the “Auto” setting, scroll past “58 kHz” and press the red button
to save
and exit).
6. Press the blue button
to confirm the new setting. (The flashing stops).
7. Press the red button
to save the new setting if it is correct, or press the blue button
to not save. Afterwards, depending on the button pressed, either the “F” menu or the
next menu appears.
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