3 Short-Range Comms & IoT Mode
3.2 Modulation Analysis Measurement
4: In instruments with EP0, balances close-in phase noise with spur avoidance. In instruments
without EP0 this setting is accepted but no action taken
5: In instruments with EP0, emphasizes spur avoidance with close-in phase noise performance. In
instruments without EP0 this setting is accepted but no action taken
The actual behavior varies somewhat depending on model number and option; you always get fast
tuning by choosing #3, but in some models, the “Fast Tuning” choice is identical to the “Best Close-In”
choice. Specifically:
–
Models with option EP0 (for example UXA), have a two stage local oscillator, which switches to a
single loop for fast tuning
–
Models with option EP1 (for example PXA), have a two-loop local oscillator, which switches to a
single loop for fast tuning
–
Models with option EP2 (available, for example, for MXA), use a different loop bandwidth for the
fast-tuning choice, which is a compromise between tuning speed and phase noise, giving good
tuning speed at all offsets, although not as good as for Close-In; this is useful when you have to
look across a wide range of spans
–
In all other cases, Fast Tuning is the same as Best Close-In.ALL_MODELS_EXCEPT_CXA-m
For E6630A,E6640A and Baker/M90XA, the SCPI command will be accepted, but always use 1
Dependencies Does not appear in all models. The control is blank in those models, but the SCPI command is
accepted for compatibility (although no action is taken)
Preset 2
State Saved Yes
Range No EPx option:
Best Close-In Phase Noise
[offset < 20 kHz] |
Best Wide-Offset Phase Noise
[offset > 30 kHz] |
Fast Tuning
[same as Close-in]
EP0:
Best Close-In Phase Noise
[offset < 600 kHz] |
Best Wide-Offset Phase Noise
[offset > 800 kHz] |
Fast Tuning |
Balance Noise & Spurs
[offset < 600 kHz] |
Best Spurs
[offset < 600 kHz] |
EP1:
Short Range Comms & IoT Mode User's &Programmer's Reference 289
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