Analog Demodulation (Option K7) R&S FSL
1300.2519.12 4.148 E-11
If DC is selected, the phase runs according to the existing frequency offset. In addition, the DC
signal contains a phase offset of
.
If AC is selected, the frequency offset and phase offset are automatically corrected, i.e. the
trace is always symmetric with respect to the zero line.
The softkey is not available with the AF spectrum display of the FM or PM signal.
Remote: ADEM:AF:COUP DC
AF Filter
Opens a submenu to select the appropriate filters. The bandwidth of the demodulated signal can
be reduced by high pass or low pass filters and also a de–emphasis can be switched on. The
selected filters are used for AM, FM and PM demodulation in common. Individual settings are
not possible.
Low Pass AF Filter
Opens the Low Pass AF Filter dialog box to select the filter type. Relative and absolute low
pass filter are available.
– Relative low pass filters:
The filters (3 dB) can be selected in % of the demodulation bandwidth. The filters are designed
as 5th–order Butterworth filter (30 dB/octave) and active for all demodulation bandwidths.
– Absolute low pass filters:
The filter are indicated by the 3 dB cutoff frequency. The 3 kHz and 15 kHz filters are designed
as 5th–order Butterworth filter (30 dB/octave). The 150 kHz filter is designed as 8th–order
Butterworth filter (48 dB/octave).
The absolute low pass filters are active in the following demodulation bandwidth range:
3 kHz: 6.4 kHz
demodulation bandwidth
4 MHz
15 kHz: 50 kHz
demodulation bandwidth
16 MHz
150 kHz: 400 kHz
demodulation bandwidth
16 MHz
Remote: FILT:LPAS ON
Remote: FILT:LPAS:FREQ 150kHz
Remote: FILT:LPAS:FREQ 25PCT
High Pass AF Filter
Opens the High Pass AF Filter dialog box to switch on a high pass filter with the given limit to
separate the DC component. The filters are indicated by the 3 dB cutoff frequency. The filters
are designed as 2nd–order Butterworth filter (12 dB/octave).
The high pass filters are active in the following demodulation bandwidth range:
50 Hz: 200 Hz
demodulation bandwidth
4 MHz
300 Hz: 800 Hz
demodulation bandwidth
16 MHz
Remote: FILT:HPAS ON
Remote: FILT:HPAS:FREQ 300Hz
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