Configuring the Signal in the RF Domain
R&S
®
SMW200A
448User Manual 1175.6632.02 ─ 16
"Wide"
The synchronization bandwidth depends on the configuration of the
instrument:
●
Instruments without option R&S SMW-B22
The synchronization bandwidth is approximately 750 Hz. This
mode is the recommended standard mode.
●
Instruments equipped with the option R&S SMW-B22
The synchronization bandwidth is approximately 100 Hz. This
mode is recommended for precise reference sources of high
spectral purity. The internal 10 MHz OCXO is bypassed and the
external signal synchronizes a 100 MHz reference oscillator
directly.
Remote command:
[:SOURce]:ROSCillator:EXTernal:SBANdwidth on page 1105
Adjustment Active
Selects the adjustment mode.
"OFF"
Uses the calibrated internal reference frequency.
"ON"
Allows you to apply a deviation to the internal reference frequency,
according to your requirements.
Enter the value in the Adjustment DAC Value field.
Remote command:
[:SOURce]:ROSCillator[:INTernal]:ADJust[:STATe] on page 1106
Adjustment DAC Value
Sets a user-defined adjustment value for the internal reference frequency. This value
takes effect when it is activated with Adjustment Active.
●
"0" represents the calibrated state.
●
The setting range depends on the reference oscillator type and its factory calibra-
tion value.
Note:
The value is not affected by an instrument preset (PRESET key or *RST) and the
"Save/Recall" function. It is reset only by factory preset.
Remote command:
[:SOURce]:ROSCillator[:INTernal]:ADJust:VALue on page 1105
7.5 Local Oscillator Coupling
The "LO Coupling" function allows a distribution of the local oscillator signal in a way
that multiple RF signals can be derived from the same LO signal. This is mandatory for
minimizing the phase fluctuations between these RF signals.
The R&S SMW uses either the internal oscillator frequency for the LO signal, that is
the output signal of the internal synthesizer, or an external frequency source. You can
select the internal or external LO signal of path A, and optionally couple it with path B.
Uncoupled, B uses its internal signal. When the LO signal is coupled, the R&S SMW
indicates the connection line in the block diagram.
Local Oscillator Coupling
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