Rohde & Schwarz CMU-K20, Operating Manual

Page: 136 / 646

Non Signalling: Spectrum Measurements CMU-K20/K21/K22/K23/K24
1115.6088.12 4.58 E-11
Switching
GMSK
The Switching GMSK hotkey selects the spectrum due to switching for GMSK
modulated signals to be displayed. In this mode, the power at the nominal
frequency and the relative power at up to 4 neighboring frequencies is displayed in
a single graph, see p.
4.60 ff.
Remote control
No explicit switchover command. All spectrum due to modulation measurements
are identified by the 2
nd
to 4
th
level keywords
...SPECtrum:SWITching[:GMSK]
Switching
8PSK
The Switching 8PSK hotkey selects the spectrum due to switching for 8PSK
modulated signals to be displayed. In this mode, the power at the nominal
frequency and the relative power at up to 4 neighboring frequencies is displayed in
a single graph, see p.
4.60 ff.
Remote control
No explicit switchover command. All spectrum due to modulation measurements
are identified by the 2
nd
to 4
th
level keywords
...SPECtrum:SWITching:EPSK
Measurement Results
The Spectrum measurement menu and the results depend on the type of spectrum (application)
selected. The scaling of the x-axis is equal for the two spectra. However, the spectrum due to
modulation is expressed in relative units (dBc), the spectrum due to switching in absolute units (dBm).
a) Spectrum due to Modulation
In the Spectrum due to Modulation measurement, the average burst power at a series of fixed
frequency points around the selected RF frequency is displayed. The results and the corresponding
settings are indicated in two parameter lines, the test diagram (bar graph), and an info box.
Parameter lines
Bar graph and
info box
Fig. 4-25 Display of results (spectrum due to modulation)
Parameter lines The first parameter line contains the following settings:
Max. Level Maximum input level set as in the Analyzer tab of the
Connection Control menu (see section Table-Oriented
Version on p. 4.73 ff.)
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