R&S FSW-K7 User Manual page 119

®
R&S FSW-K7
Remote command:
[SENSe:]FILTer<n>:CCITt
[SENSe:]FILTer<n>:CCIR:[:UNWeighted][:STATe]
[SENSe:]FILTer<n>:CCIR:WEIGhted[:STATe]
[SENSe:]FILTer<n>:AWEighted[:STATe]
Deemphasis
Activates a deemphasis filter with the given time constant.
Sometimes a modulated signal is extorted by a pre-emphasis filter before transmission,
for example to eliminate frequencies that are more prone to interferences. In this case,
the emphasis function must be reversed after demodulation. This is done by the deem-
phasis filter.
The deemphasis filter is active in the following demodulation bandwidth range:
25 µs:
50 µs:
75 µs:
750 µs:
Depending on the deemphasis filter, a minimum demodulation bandwidth is required
for an error less than 0.5 dB, up to a maximum AF frequency. The following table
shows the dependencies.
Deemphasis [us]
Max. AF frequency
Required demodulation bandwidth
For higher AF frequencies the demodulation bandwidth must be increased.
Remote command:
[SENSe:]FILTer<n>:DEMPhasis[:STATe]
[SENSe:]FILTer<n>:DEMPhasis:TCONstant
Deactivating all AF Filters
The "All Filter Off" button deactivates all AF filters for the selected evaluation.
Remote command:
[SENSe:]FILTer<n>:AOFF
5.7.4 Scaling
Access: "Overview" > "Demod Settings" > "Scaling"
Or: "Meas Setup" > "Demod" > "Scaling" tab
User Manual 1173.9240.02 ─ 23
on page 275
25 kHz ≤ demodulation bandwidth ≤ 40 MHz
6.4 kHz ≤ demodulation bandwidth ≤ 18 MHz
6.4 kHz ≤ demodulation bandwidth ≤ 18 MHz
800 Hz ≤ demodulation bandwidth ≤ 3 MHz
25 µs
25 kHz
≥ 200 kHz
on page 274
on page 275
on page 274
on page 274
50 µs 75 µs
12 kHz 8 kHz
≥ 100 kHz ≥ 50 kHz
on page 276
on page 275
Configuration
Demodulation
750 µs
800 Hz
≥ 6.4 kHz
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