R&S SMB Modulations
1407.0806.32 4.61 E-2
Modulations
The R&S SMB Signal Generator provides amplitude modulation (AM), frequency modulation (FM),
phase modulation (PM( and pulse modulation. In addition, the RF signal can be modulated with internal
modulations waveforms, e.g. sine waves and rectangular signals.
Amplitude, frequency and phase modulation are available for the basic unit (R&S SMB + frequency
option R&S SMB-B10x) without additional equipment options. A standard LF generator is provided for
internal modulation.
Pulse modulation and a pulse generator are provided by options R&S SMB-K22, Pulse Modulator and
R&S SMB-K23, Pulse Generator, respectively.
Settings for the modulation are made in separate modulation menus. These menus can be accessed in
the block diagram by way of the MOD function block, or by means of the menu with the same name
which is opened using the
MENU key.
The
MOD ON/OFF key switches the active modulations on and off. 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-control command:
SOUR:MOD:ALL:STAT OFF
The activated and deactivated state is indicated in the block diagram by means of the different block
color and the status of the On checkbox. The active modulations are indicated in the block.
Modulation Sources
For amplitude, pulse, frequency and phase modulation the internal and external modulation source can
be used.
Internal Modulation Sources
A LF generatorand a pulse generator are available as internal modulation sources for a fully equipped
instrument. The LF generator supplies sinusoidal or rectangular signals (see also the section "LF
Output Menu", page 4.81). The optional pulse generator provides single and double pulse modulation
with selectable pulse widths and periods.
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