Configuring the Internal Baseband Source
R&S
®
SMW200A
235User Manual 1175.6632.02 ─ 16
Marker Modes
The marker mode is a characteristic for the shape and the periodicity of the marker.
The R&S SMW provides several different modes to define different marker signals.
Most of them are specific for each of the firmware options. This section focuses only on
the general commonly available marker signals.
Generally, the marker signal can change from "On" (high) to "Off" (low) state or vice
versa after some period of time. The instrument provides various ways to describe the
marker signal. Use the method that best suits your needs.
Marker mode restart
The generated marker signal is a single "On" pulse. The rising edge of this pulse is
generated at the signal generation start as well as at each subsequent signal restart
time. This marker can be used to monitor the effects of the selected trigger, e.g. trigger
causing restarts of the signal generation.
Marker mode pulse
Periodic marker with consecutive On and Off periods of equal length. The first On
period starts at the beginning of the first generated sample/symbol. The marker fre-
quency is defined by a "Divider". The frequency is derived as follows:
<Frequency> = "Symbol/Sample Rate" / "Divider", respectively
<Frequency> = "Sampling Frequency" / "Divider".
Example:
"Symbol Rate = 1 Msym/s", "Divider = 2"
The marker frequency is 500 kHz, corresponding to a marker period of 2 us. Each On
and Off period has a length of 1 us, corresponding to one symbol period. With a divider
of 4 (6, 8 ...), the length of each On and Off period is increased to 2 (3, 4, ...) symbol
periods.
Marker mode pattern
Periodic marker where each period is defined by a bit pattern with a maximum length
of 64 bits. A "1" ("0") in the pattern denotes an On (Off) signal segment with a duration
of one sample/symbol period.
Common Functions and Settings in the Baseband Domain
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