CMU RF Measurements
1100.4903.12 6.35 E-10
Subsystem RFGenerator:MODulation (Frequency Modulation)
The subsystem RFGenerator:MODulation determines the frequency modulation of the internal RF gen-
erator. It corresponds to the Modulation settings in the Generator tab of the Connection Control menu.
SOURce:RFGenerator:MODulation <State> Modulation
<State>
Parameter description Def. value Def. unit FW vers.
OFF |
SSB |
AM
No modulation, continuous wave
RF output signal shifted by a constant offset frequency
RF output signal amplitude-modulated
OFF – V1.15,
V2.15
(AM)
Command description
This command determines the modulation of the RF output signal. In the SSB mode, the frequency of the RF
output signal is shifted by the frequency defined via CONF:RFG:MOD:SSB:FREQ. In the AM mode, the signal is
modulated with the frequency defined via CONF:RFG:MOD:SSB:FREQ and with the modulation index defined via
CONF:RFG:MOD[:AM]:IND; see below.
SOURce:RFGenerator:MODulation:SSB:FREQuency <Deviation> AF Frequency
<Deviation>
Parameter description Def. value Def. unit FW vers.
–300 kHz to +300 kHz
|
0 kHz to +300 kHz
SSB frequency offset (resolution 1 kHz)
AM modulation frequency
1000
1000
Hz
Hz
V1.15,
V2.15
(AM)
Command description
This command generates an AF frequency which defines either a frequency offset (if SOUR:RFG:MOD is set to
SSB) or an AM modulation frequency (if SOUR:RFG:MOD is set to AM). A frequency offset can be either positive or
negative; modulation frequencies must be positive.
SOURce:RFGenerator:MODulation[:AM]:INDex <Mod_Index> Modulation Index
<Mod_Index>
Parameter description Def. value Def. unit FW vers.
0 % to 100 %
Modulation index 100 % V1.15,
V2.15
(AM)
Command description
This command defines the modulation index for AM modulation, i.e. the amplitude ration between the modulating
AM signal to the RF carrier signal in percent.
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