Instrument Function
R&S
®
SMB100A
215
Operating Manual 1407.0806.32 ─ 21
Remote command:
[:SOURce]:STEReo:AUDio:PREemphasis:STATe
[:SOURce]:STEReo:AUDio:PREemphasis
Max Modulation Freq- Stereo Modulation
Sets the maximum modulation frequency that may be used.
This parameter is valid/required only when pre-emphasis has been activated and an
external modulation source is used.
Pre-emphasis increases the high-frequency portions of the signal in the level before
the FM modulator is reached. This can lead to internal overload of the modulator in the
case of sinewave signals with full modulation. The MMF parameter is used to reduce
the internal full modulation to such an extent that sinewave signals with nominal volt-
age can be transmitted with low distortion at the stereo input even when pre-emphasis
up to the set frequency has been activated. However, this reduces the S/N ratio on the
basis of the increase in level by the pre-emphasis (at the MMF that has been set).
In the case of normal modulation signals such as voice or music, this parameter can be
left at its default value because the amplitude of the high-frequency portions of these
signals normally decreases substantially.
Remote command:
Stereo Pilot Tone Settings
The 19 kHz pilot tone is configured in the "Stereo Pilot Tone Settings" section.
Pilot State - Stereo Modulation
Activates/deactivates the pilot tone generation.
Remote command:
Pilot Deviation - Stereo Modulation
Sets the deviation of the pilot tone.
Remote command:
[:SOURce]:STEReo:PILot[:DEViation]
Pilot Phase - Stereo Modulation
Sets the phase of the pilot tone in relation to the 38 kHz carrier signal of the receiver.
For a correct demodulation, the pilot tone must be in phase with the 38 kHz carrier.
Remote command:
ARI Settings
The radio traffic service ARI (Automotive Radio Information) is configured in the "ARI
Settings" section.
Modulation
