R&S SMA100B - Deviation; Deviation Mode; Mode; Phim Settings

Analog modulations
R&S
®
SMA100B
89User Manual 1178.3834.02 ─ 09
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 576
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 576
PhiM settings
The following settings are dedicated to PhiM.
Deviation ← PhiM settings
Sets the phase modulation deviation in radians or degrees.
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]:PM<ch>[:DEViation] on page 581
Deviation Mode ← PhiM settings
Enables you to couple the LF signal of both paths and determines the mode for fixing
the total deviation.
The deviation sum 2 rad at a maximum. When the sum is exceeded, the
R&S SMA100B adjusts the settings automatically.
"Uncoupled"
Enables you to adjust the deviation for each path independently.
"Fixed Total"
Couples the deviation of both paths. If you change the deviation 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>]:PM:DEViation:MODE on page 580
Modulation settings