Modulations R&S SMC100A
1411.4060.32 4.80 E-1
Modulations
The R&S SMC 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.
The modulations are available for the basic unit (R&S SMC + frequency option R&S SMC-B10x) without
additional equipment options. A standard LF generator is provided for internal modulation.
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
SETUP 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 generator and a pulse generator are available as internal modulation sources. The LF generator
supplies sinusoidal signals (see also the section "LF Output Menu", page 4.98). The pulse generator
provides single and double pulse modulation with selectable pulse widths and periods.
External Modulation Sources
The modulation inputs MOD EXT and PULSE EXT at the rear of the instrument are provided as the
external modulation source for amplitude, pulse, frequency and phase modulation.
The external modulation signal at the inputs must have a voltage of V
s
= 1 V (V
eff
= 0.707 V) in order to
achieve the displayed modulation depth and range. The input voltage should not exceed 1.1 V
s
,
otherwise modulation distortions might occur. With external pulse modulation, the switching point is
max. 2.4 V and the voltage at the input should not exceed 5 V. The maximum modulation frequency is
10 MHz for frequency and phase modulation.
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