Analog Modulations
R&S
®
SMA100B
83User Manual 1178.3834.02 ─ 05
"Normal"
Performs the standard amplitude modulation with a single sinusoidal
carrier signal.
"Scan"
(Option: R&S SMAB-K721)
Performs amplitude modulation with a higher dynamic range.
The R&S SMA100B provides a special exponential amplitude modu-
lation system optimized for highest dynamic range. You can use the
scan mode to emulate level behaviors of transmitter/receiver systems
with rotating antennas. Selecting "Mode > Scan" sets the modulation
type to "Exponential".
Note: Using exponential AM with an external source affects other
operating modes as described in "Interactions and characteristics"
on page 74.
Remote command:
[:SOURce<hw>]:AM:MODE on page 517
Type ← AM settings
Selects the type of the amplitude modulation for both paths.
Using exponential AM with an external source affects the coupling mode and the exter-
nal modulation input, see "Interactions and characteristics" on page 74.
"Linear"
Sets linear amplitude modulation with depths specified in per-
cent / volt.
"Exponential"
Sets ethe exponential AM type with depths in dB / volt.
Remote command:
[:SOURce<hw>]:AM:TYPE on page 519
Depth ← AM settings
Determines the depth of the modulation signal in percent.
For "Type = Exponential", the unit of "AM Depth" changes to dB.
The depth is limited by the maximum peak envelope power (PEP).
Remote command:
[:SOURce<hw>]:AM<ch>:DEPTh:LINear on page 516
[:SOURce<hw>]:AM<ch>:DEPTh:EXPonential on page 517
Sensitivity ← AM settings
Sets the input sensitivity of the external modulation signal.
Remote command:
[:SOURce<hw>]:AM<ch>:SENSitivity[:LINear] on page 519
[:SOURce<hw>]:AM<ch>:SENSitivity:EXPonential on page 518
Deviation Mode ← AM settings
Enables you to couple the LF signal of both paths and determines the mode for fixing
the total deviation.
The deviation sum of both paths is 100% in total. 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 depth for each path independ-
ently.
Modulation Settings
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