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JD780A Series Analyzers
Occupied bandwidth
The Occupied Bandwidth measures the spectrum shape of the carrier. It is defined as the bandwidth,
which includes 99% of the transmitted power among total transmitted power.
Setting measure setup
After configuring test parameters as described in the "Configuring test parameters" on page 125, you
can continue your measurement.
Procedure
1.
Press the MEASURE SETUP hot key.
2.
Press the Time Slot soft key to assign a time slot with which performs measurements, and then
select your desired time slot number from 0 to 7.
3.
Optional. To set the delay, complete the following steps:
a.
Press the Miscellaneous soft key.
b.
Press the Delay soft key to set the amount of delay in µs.
c.
Enter a value by using the numeric keys. You can also use the rotary knob.
d.
Press the µs soft key.
NOTE
The Delay setting is used only when there is a time offset in the signals to be measured.
Measurement example
The Occupied Bandwidth measurement shows both of power across the band and power bandwidth in
a user specified percentage to determine the amount of spectrum used by a modulated signal.
Occupied bandwidth is typically calculated as the bandwidth containing 99% of the transmitted power.
Figure 41
Occupied bandwidth measurement with GSM signal analyzer
NOTE
You can use the LIMIT hot key to analyze your measurements with the user-definable
limit and Pass/Fail indication. See "Setting limit for RF tests" on page 136 for more
132
Using GSM/GPRS/EDGE Signal Analyzer
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