NARDA IDA - Page 101

6.3 Setting the center frequency (Fcent)
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Changing the rotary control knob function
You can set the following functions for the rotary control knob:
To change the rotary control knob function:
 The Fcent softkey is displayed.
1. Press the Fcent softkey.
2. Press the Rotary Knob softkey and select the desired function.
6.3.3 Setting Fspan and Fstart / Fstop (Spectrum only)
Spectrum
NOTE: A frequency range must always be set for Spectrum operating mode. This
is set by default by the center frequency and the frequency span. You can
also set the frequency range by defining the start and stop frequencies.
To change the frequency range setting:
1. Press the Set Fstart & Fstop or Set Fcent & Fspan softkey until the
desired setting method is displayed.
 The labels on the Fstart / Fstop and Fcent / Fspan softkeys also
change to match the selected setting method.
Table 24: Description of Rotary Knob softkey
Softkey Description
Rotary Knob:
Immediate (default)
The center frequency is set directly by turning the rotary
control knob.
Rotary Knob:
Preselect
The Fcent softkey must be pressed first before you can
change the center frequency using the rotary control knob
and set it by pressing the OK key.
This setting is recommended to prevent changing the
center frequency by mistake.
Rotary Knob: TxTbl This setting is only displayed if a Transmitter Table has
been selected (see Creating and editing Transmitter Tables
on page 82). After you press the Fcent softkey, use the
rotary control knob to highlight a transmitter in the table and
press OK to select it.