Reference oscillator
R&S
®
SMA100B
297User Manual 1178.3834.02 ─ 09
"100 MHz, 1 GHz"
Option: R&S SMAB-K703
Selects the external reference frequency.
"Variable"
Option: R&S SMAB-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 694
Variable Reference Frequency
Option: R&S SMAB-K704
Sets the variably settable external reference frequency.
Remote command:
[:SOURce]:ROSCillator:EXTernal:FREQuency:VARiable on page 694
Synchronization Bandwidth
Selects the synchronization bandwidth for an external reference signal.
The resulting bandwidth is indicated by the parameter Nominal Synchronization Band-
width.
"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 SMA100B issues an error message.
For more information, see data sheet.
Remote command:
[:SOURce]:ROSCillator:EXTernal:SBANdwidth on page 694
Nominal Synchronization Bandwidth
Indicates the nominal synchronization bandwidth for the selected External Reference
Frequency and the Synchronization Bandwidth.
Remote command:
[:SOURce]:ROSCillator:EXTernal:NSBandwidth? on page 695
Minimum Locking Range
Indicates the minimum locking range for the selected External Reference Frequency
and the Synchronization Bandwidth.
Reference frequency settings
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