Analog modulations
R&S
®
SMA100B
90User Manual 1178.3834.02 ─ 09
Total Deviation ← PhiM settings
In Deviation Mode = Fixed Total, sets the sum of the signal deviation for path 1 and
path 2.
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 deviations 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>]:PM:DEViation:SUM on page 580
Ratio Path2/Path1 ← PhiM settings
Sets the deviation ratio (path2 to path1) in per cent.
Example:
If the deviation in path1 is 10 rad and the ratio is 50%, the deviation in path 2 is auto-
matically set to 5 rad.
Remote command:
[:SOURce<hw>]:PM:RATio on page 580
Mode ← PhiM settings
Selects the mode of the phase modulation.
"High Bandwidth"
The maximum range for modulation bandwidth and PhiM deviation is
available.
However, phase noise increases at low frequencies, and the range of
PhiM deviation is limited. This mode is suitable if you process high
frequencies.
"High Deviation"
The maximum range for PhiM deviation is available.
Phase noise is improved for low frequencies compared to the default
mode. The range for modulation frequency is limited (see data sheet).
This mode is suitable for low modulation frequencies and/or high
PhiM deviation.
"Low Noise"
Frequency 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).
Remote command:
[:SOURce<hw>]:PM:MODE on page 579
AM settings
The following settings are dedicated to AM.
Modulation settings
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