Instrument Function
R&S
®
SMB100A
197
Operating Manual 1407.0806.32 ─ 21
The R&S
SMB provides all the various types of modulation, such as:
●
AM (Amplitude Modulation)
●
FM (Frequency Modulation)
●
PhiM (Phase Modulation)
●
PULM (Pulse Modulation)
●
Stereo Modulation
In addition, the RF signal can be modulated with various internally generated modula-
tion waveforms, like sine or rectangular signal waves. The basic unit (R&S
SMB + fre-
quency option) provides amplitude, frequency and phase modulation without additional
equipment options, as well as a standard LF generator provided for internal modula-
tion. Further available options are:
●
R&S
SMB-B5, Stereo/RDS Coder for performing stereo modulation
●
R&S
SMB-K21, Pulse Modulation for instruments with high frequency options
●
R&S
SMB-K22, Pulse Modulation for instruments equipped with frequency-options
up to 6 GHz
●
R&S
SMB-K23, Pulse Generator for pulse signals
●
R&S
SMB-K27 Pulse Train for generating pulse train signals (only for instruments
with serial number higher than 102400)
Settings for the modulation are made in separate modulation menus. These menus
can be accessed in the block diagram by way of the "Modulation" function block, or by
means of the menu with the same name which is opened using the MENU key.
5.4.1.1
Enabling/Disabling Analog Modulations using the MOD On/Off Key
The MOD ON/OFF key switches the modulations on and off.
MOD ON/OFF
Press the MOD ON/OFF key to enable/disable analog modulations.
Pressing the key again restores the status that was active before the last switch-off.
"MOD OFF" is displayed in the info line of the header next to the "Level" field.
Remote command:
[:SOURce<hw>]:MODulation[:ALL][:STATe]
5.4.1.2
Modulation Sources
The following modulations use internal and external modulation sources:
●
Amplitude modulation
●
Pulse modulation
●
Frequency modulation
●
Phase modulation
Modulation
