Configuring the Signal in the RF Domain
R&S
®
SMW200A
493User Manual 1175.6632.02 ─ 16
To create list mode data
1. Select "RF" > "Sweep/List" > "List Mode".
2. In the "List Mode Data" tab, select "List Mode Data > New"
3. Enter the filename ListMode_Test for the data list and confirm with "Ok".
The instrument creates a file and stores it in the /var/user/ directory.
4. Select "Edit List Mode Data".
5. Enter the first value pairs "Frequency > 2", "Power > 0" and "Dwell > 2".
6. Enter further frequency, power and dwell time values in the same way.
7. Select "Save" and close the dialog.
To configure the list processing 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.
During list processing, 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?.
7.7 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
Analog Modulations
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