Configuring the Internal Baseband Source
R&S
®
SMW200A
241User Manual 1175.6632.02 ─ 30
Table 5-10: Impact of the parameter Sync. Output to (External) Trigger
"Sync. Output to (External) Trigger = On" "Sync. Output to (External) Trigger = Off"
Suitable for long signal sequences
The output signal is synchronous to the trigger event
after elapsing of the internal processing time.
In primary-secondary instrument mode, this setting
ensures that once achieved, synchronization is not
lost if the baseband signal sampling rate changes.
See also Chapter 10.3.1.2, "How to Connect and
Configure Instruments in Primary-Secondary Instru-
ment Mode", on page 644.
Suitable for triggering of short signal sequences with
signal duration comparable with the processing time
of the instrument
Suppressing and delaying trigger events
The main focus of the following features is the mobile communication standards.
●
"(External) Trigger Delay"
You can apply a definable number of symbols to delay the start trigger event of an
externally supplied or routed from the other path trigger signals
This feature is useful to:
– Simulate the time delay between a base station signal and a user equipment
signal, for example during base station tests
– Compensate for known propagation delays or a timing offset in the test setups
– Enable a time delay between the generated baseband signals
●
"(External) Trigger Inhibit"
You can suppress the effect of a restarted trigger signal in the "Retrigger" trigger
mode for a definable number of symbols.
During base station tests, for example, this feature enables the trigger suppression
for a definable number of frames and yet the signal can still be generated synchro-
nously. In each frame, the base station generates a trigger which would cause a
signal generation restart every time but for the suppression.
Example:
A trigger delay of 1000 samples means that after a trigger event, any subsequent trig-
ger signal is ignored for the space of 1000 samples.
Common Functions and Settings in the Baseband Domain
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