3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
FM Demod De-emphasis
Controls a single-pole filter (6 dB/octave roll off) for the Tune & Listen function,
usually to counter intentional pre-emphasis in the transmitter. When De-emphasis
state is OFF, the hardware digital filter is bypassed, otherwise the setting is applied.
The choices are Off, 25 µs, 50 µs, 75 µs, and 750 µs.
Only available when FM is the demod selected. Grayed-out for AM and PM.
Remote Command
[:SENSe]:DEMod:FM:DEEMphasis OFF | US25 | US50 | US75 | US750
[:SENSe]:DEMod:FM:DEEMphasis?
Example Set the de-emphasis for FM demod to 75 µs:
:DEM:FM:DEEM US75
Dependencies Only available in FM. Grayed-out for AM and PM
Preset
US75
Recommended for US commercial FM 75 µs pre-emphasis
State Saved Saved in instrument state
3.2.8.6 Advanced
Contains controls for setting advanced functions of the instrument.
Does not appear in instruments that do not contain Advanced functions. Most of the
modular instruments (including VXT models M9410A/11A) fall into this category, as
does UXM.
Phase Noise Optimization
Selects the LO (local oscillator) phase noise behavior for various desired operating
conditions.
For full details, see "Parameter Options, Installed Options, Auto Rules & Ranges" on
page 433 below.
Remote Command
[:SENSe]:FREQuency:SYNThesis[:STATe] 1 | … | 5
[:SENSe]:FREQuency:SYNThesis[:STATe]?
Example Select optimization for best wide offset phase noise:
:FREQ:SYNT 2
Dependencies Does not appear in all models. The control is not displayed in those models, but the command is
accepted for compatibility (although no action is taken)
Preset Because this function is in Auto after preset, and because Span after preset > 314.16 kHz (see Auto
rules, next section) the state of this function after Preset will be 2
432 Spectrum Analyzer Mode User's &Programmer's Reference
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