Reference oscillator
R&S
®
SMB100B
187User Manual 1178.3711.02 ─ 08
"10 MHz"
Selects 10 MHz for the external reference frequency signal.
"100 MHz, 1 GHz"
Option: R&S SMBB-B3
The R&S SMB100B locks its internal 500 MHz reference oscillator on
the 100 MHz or 1 GHz reference.
Selects the external reference frequency.
"Variable"
Option: R&S SMBB-K704
The external reference signal has an arbitrary frequency, within the
permissible range from 1 MHz to 100 MHz.
Remote command:
[:SOURce]:ROSCillator:EXTernal:FREQuency on page 502
Variable Reference Frequency
Option: R&S SMBB-K704
Sets the variably settable external reference frequency.
Remote command:
[:SOURce]:ROSCillator:EXTernal:FREQuency:VARiable on page 502
Synchronization Bandwidth
Selects the synchronization bandwidth for an external reference signal, set with Source
> External.
The resulting bandwidth is indicated by the parameter Nominal Synchronization Band-
width.
Note: If you preset or set the reference source from "External" to "Internal", the syn-
chronization bandwidth is reset to "Narrow".
"Narrow"
The internal reference oscillator is synchronized to the external signal
with narrow bandwidth.
This setting is recommended if the phase noise of the external signal
is worse than the phase noise of the internal OCXO.
"Wide"
Synchronizes the internal oscillator to the external signal with the
maximum possible bandwidth.
This mode is the recommended standard mode and for precise refer-
ence sources of high spectral purity.
Note: If the frequency of the external reference signal is outside the
locking range of the internal reference oscillator, spurs due to the dif-
ference of the internal and external reference frequency are gener-
ated in the reference PLL.
The R&S SMB100B issues an error message.
For more information, see data sheet.
Remote command:
[:SOURce]:ROSCillator:EXTernal:SBANdwidth on page 503
Nominal Synchronization Bandwidth
Indicates the nominal synchronization bandwidth for the selected External Reference
Frequency and the Synchronization Bandwidth.
Reference frequency settings
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