R3267 Series Spectrum Analyzer Operation Manual (Vol.1)
3.3.7 COUPLE Key (Couple Function)
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Displays the Couple(2) menu.
PLL Band Width
Displays the PLL Band Width dialog box.
PLL Band Width
Sets the bandwidth of the band-pass filter in the PLL circuit.
AUTO:
Automatically sets the filter bandwidth so that optimum
phase noise characteristics (corresponding to the fre-
quency span) can be obtained.
NARROW:
Sets a narrow bandwidth.
Phase noise of the carrier frequency is reduced within
-100 kHz and +100 kHz.
MEDIUM:
Sets a medium bandwidth.
WIDE:
Sets a wide bandwidth.
Phase noise of the carrier frequency is reduced within
-10 kHz and +10 kHz.
CAUTION
The phase noise characteristics may be degraded if
PLL Bandwidth is set to WIDE, MEDIUM or NAR-
ROW. If this happens, set the PLL BandWidth to
AUTO.
RBW
≤≤≤≤
100Hz ANLG/DGTL
Displays the mode of the filter to be used when an RBW equal to
or lower than 100 Hz is selected.
ANLG:
An analog filter is used. The highest filter resolution is
10 Hz.
DGTL:
A digital filter is used preferentially. The highest filter
resolution is 1 Hz.
