Analog Modulations
R&S
®
SMA100B
107User Manual 1178.3834.02 ─ 05
To generate a two-tone signal composed form the two paths of the same modu-
lation type, activate both paths.
● The "FM" box allows switching to "PhiM", but those modulations are mutually
exclusive.
LFOut
Label for the LF output settings in the overview.
Remote command:
n.a.
AM
Label for the amplitude modulation settings in the overview.
Remote command:
n.a.
FM/PhiM
Selects the modulation signal to be assigned to the output. You can assign the fre-
quency or phase modulated signal.
Remote command:
n.a.
4.5 How to Generate an Amplitude Modulated Signal
The following examples use the internal LF generator.
To set the frequency and level of the RF signal
1. Press [Preset] to start from a defined state.
2. In the status bar, set "Frequency = 2 GHz".
3. Set "Level = -20 dBm".
To configure the modulation signal (LF generator)
1. Select "Modulation" > "Modulation Source".
2. In the "Sources" tab, select "Shape > Sine".
3. Set "Frequency = 20 kHz".
The period is calculated automatically and indicates "Period = 50.00 µs".
To configure the amplitude modulation settings
1. In "Modulation" dialog, select the "AM" tab.
2. Set "Source = LF Generator1"
3. Set "Depth = 30%"
4. Select "State = I" to activate the modulation.
How to Generate an Amplitude Modulated Signal
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