Analog modulations
R&S
®
SMA100B
88User Manual 1178.3834.02 ─ 09
Remote command:
[:SOURce<hw>]:AM<ch>:SOURce on page 565
[:SOURce<hw>]:FM<ch>:SOURce on page 574
[:SOURce<hw>]:PM<ch>:SOURce on page 579
FM settings
The following settings are dedicated to FM.
Deviation ← FM settings
Sets the frequency modulation deviation in Hz.
The maximal deviation depends on the RF frequency and the selected modulation
mode (see data sheet).
Maximal possible deviation is selected automatically, if one of the following applies:
●
The selected deviation is too high for the particular frequency
●
The selected frequency is outside of the range where deviation is possible.
A warning message indicates this situation, too.
Remote command:
[:SOURce<hw>]:FM<ch>[:DEViation] on page 574
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 575
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 575
Ratio Path2/Path1 ← FM settings
Sets the deviation ratio (path2 to path1) in percent.
Modulation settings
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