3 Short-Range Comms & IoT Mode
3.11 IQ Waveform Measurement
Models with Option Conditions Selection
between tuning speed and phase
noise, giving good tuning speed at all
offsets. Although not as good as for
"Best Close-in" on page 1607; this is
useful when you have to look across a
wide range of spans
(available, for example, in MXA for
excellent phase noise)
Span > 22 MHz, or
RBW > 400 kHz, or
CF ≤ 12 MHz and Span < 495 kHz and
RBW < 23 kHz
"Fast Tuning" on
page 1608
All other conditions "Best Wide-
offset" on page
1608
EP4
(available in CXA for improved phase
noise)
Span > 101 MHz or
RBW > 1.15 MHz or
Source Mode is set to “Tracking”
"Fast Tuning" on
page 1608
CF is < 109 kHz or
CF >= 4.95 MHz and Span <= 666kHz
and RBW < 28 kHz
"Best Close-in"
on page 1607
All other conditions "Best Wide-
offset" on page
1608
All Other Models
Note that in these models, the
hardware does not actually provide for
an extra-fast tuning option, so the
settings for "Fast Tuning" on page
1608 are actually the same as "Best
Close-in" on page 1607, but the rules
are implemented this way so that the
user who doesn't care about phase
noise but does care about tuning
speed doesn't have to remember
which of the other two settings gives
faster tuning
Span > 12.34 MHz, or
RBW > 250 kHz, or
Source Mode is set to “Tracking”
"Fast Tuning" on
page 1608
Center frequency is < 25 kHz, or
CF >= 1 MHz and Span <= 141.4 kHz
and RBW <= 5 kHz
"Best Close-in"
on page 1607
All other conditions "Best Wide-
offset" on page
1608
In all the above cases:
–
The RBW to be used in the calculations is the equivalent –3 dB bandwidth of the
current RBW filter
–
The rules apply whether in swept spans, zero span, or FFT spans
1610 Short Range Comms & IoT Mode User's &Programmer's Reference
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