Analog modulations
R&S
®
SMB100B
70User Manual 1178.3711.02 ─ 08
Interactions and characteristics
●
FM and PhiM modulations exclude each other and cannot be performed simultane-
ously.
●
In sweep mode, LF frequency sweep is possible.
●
The settings of the modulation signal affect all analog modulations that use an
internal modulation source.
●
You can feed an external LF signal in each of the two paths.
●
Considerations to AM when using an external modulation signal:
If external modulation is enabled, the RFoutput amplitude follows the external mod-
ulation signal with a scaling factor defined by the modulation sensitivity setting.
With Coupling (AC/DC) > DC, the RF output signal behaves according to:
– input signal = 0 V: the RF output amplitude corresponds to the level value set in
the R&S SMB100B
– input signal = +1 V: the output level increases up to the maximum value given
by the set modulation sensitivity
– input signal = -1 V: the output level decreases down to the minimum value
given by the set modulation sensitivity
With Coupling (AC/DC) > AC, the modulation input signal is internally highpass fil-
tered. Therefore, the DC content of the input signal is removed before it reaches
the amplitude modulator.
For more information, see data sheet.
5.3 Activating analog modulations
► Use one of the following:
● Select "Modulation > Amplitude Modulation/Frequency Modulation/Phase Mod-
ulation > State > ON".
● Select "Modulation > MOD ON".
● Press the [Mod on/off] key.
[Mod on/off]
Activate one or more analog modulations and press the [Mod on/off] key to toggle the
state of them all.
Pressing the key again restores the status that was active before the last switch-off.
Remote command:
[:SOURce<hw>]:MODulation[:ALL][:STATe] on page 412
Activating analog modulations
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