Rohde & Schwarz SMW200A - AM, FM and Phim Modulation Settings

Configuring the Signal in the RF Domain
R&S
®
SMW200A
506User Manual 1175.6632.02 ─ 16
"Equal"
Generates an even distributed noise.
Remote command:
[:SOURce<hw>]:NOISe:DISTribution on page 1089
Bandwidth ← Noise Generator
Sets the noise bandwidth as distinct value.
You can set the bandwidth between 10 kHz and 10 MHz, according to the frequency
with varying step sizes:
●
100 kHz steps (100 kHz ...1 MHz)
●
1 MHz steps (1 MHz ... 5 MHz)
●
5 MHz steps (5 MHz … 10 MHz)
The noise signal is generated within the set frequency bandwidth. The noise level in
the frequency band is defined by "Noise Level (System Bandwidth)".
Remote command:
[:SOURce<hw>]:NOISe:BANDwidth|BWIDth on page 1088
[:SOURce<hw>]:NOISe:BWIDth:STATe on page 1088
Noise Density ← Noise Generator
Indicates the level of the noise signal for a bandwidth of 1 Hz (relative).
Remote command:
[:SOURce<hw>]:NOISe:LEVel<ch>:RELative? on page 1089
Noise Level ← Noise Generator
Indicates the level of the noise signal per Hz within the total bandwidth (absolute).
Remote command:
[:SOURce<hw>]:NOISe:LEVel<ch>[:ABSolute]? on page 1089
7.7.3.2 AM, FM and PhiM Modulation Settings
The"AM", "FM" and "ΦM" tabs contain the parameters for the respective modulation
types.
Since you need to determine an LF signal source for all modulations, "Source" and
"State" are described in general. These parameters apply to the modulation modes
AM, FM and ΦM. The following description explains the specific settings for the appro-
priate modulation modes.
► To access the corresponding dialog, select "RF" and the associated menu entry:
"Amplitude Modulation", "Frequency Modulation" or "Phase Modulation".
State
Activates a modulation.
Note: Some analog modulations cannot be run simultaneously with e.g. ARB, I/Q mod-
ulation or digital modulation, as well as with the digital standards. See Chapter 7.7.6.1,
"Simultaneous Operation of Several Modulations", on page 520 for an overview.
Analog Modulations