Tektronix SPECMON3 Manual page 172

RF Measurements
Freq & RBW Tab for ACPR and MCPR Displays
The Freq & RBW tab specifies frequency parameters for the Channel Power & ACPR measurements and
MCPR measurement.
Setting
Center Freq
Step
RBW
VBW
xxx
NOTE. While the center frequency and step settings on this control tab are shared between ACPR, MCPR
and Occupied Bandwidth, the RBW setting is not shared. The RBW setting is unique for each measurement.
VBW
The VBW setting enables/disables the Video Bandwidth filter. VBW is used in traditional swept analyzers
to reduce the effect of noise on the displayed signal. The VBW algorithm in the analyzer emulates the
VBW filters of traditional swept analyzers.
The maximum VBW value is the current RBW setting. The minimum VBW value is 1/10,000 of the
RBW setting.
NOTE. If you are following a procedure that says to "set VBW to three times the RBW value or greater", it
means that the test should be conducted with no VBW effects. In the RSA6100B Series instruments, this
condition is met by disabling the VBW function.
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Description
Specifies the center/measurement frequency.
The Step control sets the increment/decrement size for the knob adjustment of the
center frequency. Arrow key adjustment of frequency is also affected (it is 10x the knob
adjustment). If Auto is enabled, the signal analyzer will adjust the Step size as required.
Select Auto or Manual. Adjusts the RBW for the entire measurement. This setting is
Independent of the Spectrum view's RBW setting.
Adjusts the VBW (Video Bandwidth) value. VBW Maximum = current RBW value. VBW
Minimum = 1/10,000 RBW setting.
Freq & RBW Tab for ACPR and MCPR Displays
SPECMON3 & SPECMON6 Printable Help