Configuring the RF Signal
R&S
®
SMW200A
501User Manual 1175.6632.02 ─ 30
Configuration and operation of sweep mode signals
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The R&S SMW generates a sweep signal by varying the following parameters:
either the RF frequency, the RF level or both, the RF frequency and the RF level in
combined RF sweep mode, or the LF frequency.
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In all sweep modes, you can perform a complete sweep cycle once, repeat the
cycle continuously or step through it gradually.
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The instrument generates the sweep signal according to the sweep settings.
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The "Reset Sweep" function, provided in the sweep settings dialogs enables you to
reset the sweep to its initial value and restart it.
Impact of changing the sweep mode during performance
If you change the sweep mode during the execution, the signal generator stops the
sweep and starts with the next trigger event at the initial value.
Combined RF frequency / level sweep processing mode
The combined RF sweep functionality processes the signal similar to the Live list
mode. The R&S SMW sets the frequency and level values simultaneously in the hard-
ware. The difference to the list mode is that the values are not taken from a previously
created list, but are calculated using the selected frequency and level ranges, the dwell
time and the number of steps.
8.7.2.1 Correlating Parameters in Sweep Mode
A sweep signal is a periodic signal that changes its frequency or level, or both, from a
starting value to an ending value in a defined time.
The R&S SMW provides various possibilities to configure a sweep signal. For example,
you can determine the sweep range by the start and end values, or based on the start
value and span. In any case, related parameters are adjusted accordingly.
The formulas below show how the sweep parameters correlate and the corresponding
calculation basis, by the frequency and offset settings. Apart from "Center Frequency",
"Span" and "Step_lin", the values apply accordingly to the level settings.
Table 8-7: Variables that are used in the following formulas
Variable Description
Sweep range Defined frequency or level value range
f
CENTer
Defined center frequency
f
SPAN
Defined extend of the sweep range
f
OFFSet
Frequency offset
f
STARt
Start frequency of the sweep range
f
STOP
End frequency of the sweep range
f
1
Current sweep frequency
Varying the RF Signal in List or Sweep Mode
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