Rohde & Schwarz SMB100A - Stereo Modulation

Instrument Function
R&S
®
SMB100A
180Operating Manual 1407.0806.32 ─ 13
Option R&S SMB-K27 enables the generation of pulse trains. For description of the pulse
train dialog, see chapter 5.5.4.2, "Pulse Train Generation", on page 197.
State
Activates/deactivates pulse modulation.
When the internal modulation source (pulse generator) is selected, the pulse generator
is switched on automatically and the video/sync signal is output at the PULSE VIDEO
output at the rear of the instrument. Signal output can be switched off in the "Pulse Gen-
erator" dialog (see chapter 5.5.4, "Pulse Generator", on page 194).
Remote command:
[:SOURce<hw>]:PULM:STATe on page 354
Source
Selects the source for the pulse modulation signal.
"Pulse Genera-
tor"
Selects the Pulse Generator as modulation source.
The internally generated reactangular signal is used for the pulse mod-
ulation.
"External"
Selects the external source.
The external modulation signal is input via the PULSE EXT connector.
Remote command:
[:SOURce<hw>]:PULM:SOURce on page 353
Polarity
(External Source only)
Selects the polarity of the modulation signal.
"Normal"
The RF signal is On while the level is high at the modulation input.
"Inverse"
The RF level is Off if the level is high at the modulation input.
Remote command:
[:SOURce<hw>]:PULM:POLarity on page 353
5.4.6 Stereo Modulation
Options R&S SMB-B5, Stereo/RDS Coder enables generation of stereo-modulated RF
signals according to standard. Beside the MPX (FM stereo multiplex) signal, also the
radio traffic service ARI (Automotive Radio Information) and Radio Data System (RDS)
are supported by the option.
An internal or external source can be selected for the audio signal of the stereo modu-
lation. In case of external source, the external signal is input via the analog L and R inputs
or via the digital S/P DIF interface at the rear of the instrument. In case of internal source,
the LF generator is used. Measurements can be performed in the operating modes L and
R, and L = R, L = –R and R!=L (ext. signals only).
A typical setup with the R&S SMB with the option Stereo/RDS Coder in connection with
the Audio Analyzer UPV is shown in the following graph.
Modulation