R&S SMB100A Operating Manual page 222

®
R&S SMB100A
An LF generator and a pulse generator are available as internal sources.
State
Activates ɸM modulation.
Activation of ɸM deactivates frequency modulation.
Remote command:
[:SOURce<hw>]:PM:STATe
ɸM Source
Selects the source for the ɸM signal.
"Internal"
"External"
"Internal + External"
Remote command:
[:SOURce<hw>]:PM:SOURce
ɸM Mode
Selects the mode for the phase modulation.
"Normal"
"High Deviation"
"Low Noise"
Remote command:
[:SOURce<hw>]:PM:MODE
ɸM Deviation
Sets the modulation deviation in RAD.
The maximum deviation depends on the set RF frequency and the selected modulation
mode (see data sheet).
If the entered deviation is too high for the set RF frequency, the instrument provides
the maximum value and displays an error message. The same applies, if the RF fre-
quency is set to a value, at which the deviation cannot be determined.
The deviation of the internal source must not exceed the deviation of the external
source in case of modulation source "Int+Ext".
Operating Manual 1407.0806.32 ─ 21
on page 376
Uses the internal LF generator as the modulation signal source for
ɸM.
Uses an externally applied modulation signal.
The external signal is input via the MOD EXT connector.
Uses both, the internal and externally applied modulation signal.
on page 375
The full range for modulation bandwidth and PM deviation is availa-
ble.
The maximum range for ɸM deviation is available. Phase noise is
improved for low frequencies compared to the default mode. The
range of modulation frequency is limited (see data sheet).
This mode is recommended for low modulation frequencies and/or
high ɸM deviation.
Phase modulation with phase noise and spurious characteristics
close to CW mode. The range for modulation bandwidth and PM
deviation is limited (see data sheet).
on page 375
Instrument Function
Modulation
207