3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
Best Spurs
Example
:SPEC:FREQ:SYNT 5
In instruments with EP0, the LO is configured for better phase noise than the “Wide-
Offset” case close to the carrier, but the configuration has 11 dB worse phase noise
than the “Best Close-In” case mostly within ±1 octave around 300 kHz offset. Spurs
are even lower than in the “Balance Noise and Spurs” case at better than −90 dBc,
whether or not the carrier is on-screen.
This setting is never selected when Phase Noise Optimization is in Auto, you must
select it manually.
Phase Noise Optimization Auto Rules
The X-Series has several grades of LO that offer different configurations when in the
Auto Mode.
–
"Models with Option EP0" on page 293 (available in UXA)
Models with Option EP0
Auto will choose:
Best Close-in Φ Noise whenever:
Center frequency is < 699.9 kHz
Otherwise, Auto will choose Fast Tuning whenever:
Span > 114.1 MHz, or when
RBW > 800 kHz
Otherwise, Auto will choose Best Wide-offset Φ Noise whenever:
RBW > 290 kHz, or when
Span > 4.2 MHz
Otherwise, Auto will choose Best Close-in Φ Noise.
The RBW to be used in the calculations above is the equivalent –3 dB bandwidth of
the current RBW filter.
These rules apply whether in swept spans, zero span, or FFT spans.
The RBW to be used in the calculations above is the equivalent –3 dB bandwidth of
the current RBW filter.
These rules apply whether in swept spans, zero span, or FFT spans.
Short Range Comms & IoT Mode User's &Programmer's Reference 293
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