Configuring the RF Signal
R&S
®
SMW200A
529User Manual 1175.6632.02 ─ 30
To configure the list mode and start signal generation
1. In the "General" tab, select "List Mode > Auto".
2. Select "Dwell Time Mode > From List".
3. Select "List Mode Data > Learn List Mode Data".
4. Switch state to "On".
5. Select "Run Mode > Learned (Frozen RF Settings)"
6. Select "General > State > On".
The instrument continuously generates an amplitude-modulated RF signal whose
frequency and level values change according to the dwell times, as defined in the
list.
With active list mode, the generator displays no frequency and level values in the
status bar, but you can check the following parameters.
● In the list mode dialog, the current index indicates the steps of the signal gener-
ation.
● In remote control mode, you can query:
– The current state with [:SOURce<hw>]:LIST:RUNNing?
– Current parameters with the commands FREQ?, POW? and LIST:DWEL?.
8.8 Analog Modulations
Analog modulation is a method used to transmit information of an LF (Low Frequency)
signal in accordance with a second signal, typically one of a higher frequency. This is
done by varying one or more properties of a high frequency waveform, called the mod-
ulation or carrier signal, with the modulating signal that contains the information to be
transmitted.
The three key parameters of the modulation signal are the:
●
Amplitude
●
Phase
●
Frequency
These parameters are modified in accordance with the low frequency signal to obtain
the modulated RF signal.
The R&S SMW supports AM (Amplitude Modulation), FM (Frequency Modulation), ΦM
(Phase Modulation (PhiM)), and also PULM (Pulse Modulation).
It generates LF modulation signals as sine, triangle, trapezoidal or square (pulse)
waveform, that can be output for use in a downstream instrument. You can also create
various interference signals such as white noise with selectable bandwidth and level
distribution.
A monitor function allows you to synchronize the LF output signal with the amplitude,
frequency or phase modulation signal.
Analog Modulations
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