Measurements
R&S
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User Manual 1173.9411.02 ─ 19
5.5.4 How to Determine the Occupied Bandwidth
How to determine the OBW for a single signal
1. Select the "OBW" measurement function from the "Select Measurement" dialog
box.
2. Select the "OBW Config" softkey to display the "Occupied Bandwidth" configuration
dialog box.
3. Define the percentage of power ("% Power Bandwidth") that defines the bandwidth
to be determined.
4. If necessary, change the channel bandwidth for the transmission channel.
5. To optimize the settings for the selected channel configuration, select "Adjust Set-
tings".
6. Start a sweep.
The result is displayed as OBW in the marker results.
How to determine the OBW for a multicarrier signal using search limits
1. Select the "OBW" measurement function from the "Select Measurement" dialog
box.
2. Select the "OBW Config" softkey to display the "Occupied Bandwidth" configuration
dialog box.
3. Define the percentage of power ("% Power Bandwidth") that defines the bandwidth
to be determined.
4. Define search limits so the search area contains only the first carrier signal:
a) Enter values for the left or right limits, or both.
b) Enable the use of the required limits.
5. Start a sweep.
The result for the first carrier is displayed as OBW in the marker results.
6. Change the search limits so the search area contains the next carrier signal as
described in
The OBW is re-calculated and the result for the next carrier is displayed. A new
sweep is not necessary!
7. Continue in this way until all carriers have been measured.
5.5.5 Measurement Example
In the following example, the bandwidth that occupies 99% of the total power of a PDC
signal at 800 MHz, level 0 dBm is measured.
Occupied Bandwidth Measurement (OBW)
