Analog Modulations
R&S
®
SMA100B
80User Manual 1178.3834.02 ─ 05
Deviation Mode ← FM settings
Enables you to couple the LF signal of both paths and determines the mode for fixing
the total deviation.
The total deviation is the sum of both paths. When the sum is exceeded, the
R&S SMA100B reports a settings conflict, but does not change the settings.
"Uncoupled"
Enables you to adjust the deviation for each path independently.
"Fixed Total"
Couples the deviation of both paths in per Hz. If you change the devi-
ation of any path, the R&S SMA100B automatically adjusts the value
of the other path. The sum always results in the set Total Deviation.
"Fixed Ratio"
Couples the deviation ratio of both paths. If you change the deviation
of any path, the R&S SMA100B adjusts the value of the other path.
Remote command:
[:SOURce<hw>]:FM:DEViation:MODE on page 522
Total Deviation ← FM settings
Sets the sum of the signal deviation for path 1 and path 2 in Hz when using combined
sources in Deviation Mode > Fixed Total.
Deviation of both paths always sum up to the value of the total deviation.
Behavior when changing any depth settings:
●
Changing the total deviation adjusts the deviation of both paths proportionally.
●
Changing the deviation of one path adjusts the deviation of the other path. The
sum always results in the set total deviation.
Remote command:
[:SOURce<hw>]:FM:DEViation:SUM on page 523
Ratio Path2/Path1 ← FM settings
Sets the deviation ratio (path2 to path1) in percent.
Example:
If the deviation in path1 is 10 kHz and the ratio is 50%, the deviation in path 2 is auto-
matically set to 5 kHz.
Remote command:
[:SOURce<hw>]:FM:RATio on page 523
Mode ← FM settings
Selects the mode of the frequency modulation.
"High Bandwidth"
The maximum range for modulation bandwidth is available.
"Low Noise"
Phase modulation with phase noise and spurious characteristics
close to CW mode. The range for modulation bandwidth and FM devi-
ation is reduced (see data sheet).
To reduce the phase noise further, set the Main PLL Bandwidth =
"Narrow"
Remote command:
[:SOURce<hw>]:FM:MODE on page 523
Modulation Settings
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