WCDMA Analyzer Measurement Guide : WCDMA Analyzer (Option 871) : Setting Frequency and Bandwidth Parameters
 
Setting Frequency and Bandwidth Parameters
Frequency and channel bandwidth parameters are set using the FREQ SPAN Menu. The channel center frequency and bandwidth can be set manually. When set to manual band, the EARFCN is unassigned. When a predefined EARFCN is selected, the uplink and downlink carrier frequencies are set automatically.
Configuring the Band
These settings are also displayed in the left side status panel and can be directly accessed from those controls.
1. Press FREQ SPAN > CENTER FREQUENCY, and then enter the center frequency using the keypad.
2. Select the channel bandwidth from the CHANNEL BW selection list.
3. Select the EARFCN code form the drop-down selection.
FREQ SPAN Menu
The FREQ SPAN menu is available in all WCDMA measurements.
FREQUENCY Menu (WCDMA Measurements)
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CENTER FREQUENCY
Sets the center frequency of the sweep range. The current span setting will remain constant or will be adjusted to accommodate the start and stop frequency range of the instrument. The center frequency can also be dragged on the display when gestures are not toggled off.
SPAN
Sets the sweep frequency range. The current center frequency will remain constant and the start and stop frequencies will be adjusted to accommodate the new range. Selecting the plus (+) or minus (–) control increments the span value in a 1:2:5 sequence. The span can also be changed by pinching the trace in or out when gestures are not toggled off.
FULL SPAN
Selecting this button sets the span to cover the entire tunable spectrum of the instrument.
START FREQUENCY
Sets the start frequency of the sweep range. The center frequency and span will be adjusted to accommodate the new start and current stop frequencies. Selecting the plus (+) or minus (–) control moves the start frequency in steps defined by the FREQUENCY STEP value.
STOP FREQUENCY
Sets the stop frequency of the sweep range. The center frequency and span will be adjusted to accommodate the current start and new stop frequencies. Selecting the plus (+) or minus (–) control moves the start frequency in steps defined by the FREQUENCY STEP value (set lower in this menu).
FREQUENCY STEP
Sets the frequency step value used for the plus (+) or minus (–) control.
FREQUENCY OFFSET
The frequency offset value accounts for frequency conversions outside of the analyzer. The offset frequency value is added to the start, stop, center, fixed marker, and normal marker frequencies. Selecting the plus (+) or minus (–) control moves the offset frequency in steps defined by the FREQUENCY STEP value.
GESTURES
Opens the GESTURES Menu. Gestures is only available in RF measurements.
GESTURES Menu
The GESTURES menu is only available in RF measurements (trace displays).
GESTURES Menu (WCDMA Measurements) 
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DRAG
Toggles the touchscreen drag feature on or off. When toggled off, the center frequency will not change when dragging the spectrum display. This can be useful when dragging markers.
Note that the Drag feature can also be toggled on/off by touching the locks under the display.