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Numeric Measurement Modes
R&S
®
EVSG1000
82
User Manual 1178.6227.02 ─ 06
The bandwidth determines the frequency range for which the measurement is per-
formed. Depending on the measurement mode, and whether a wideband or a specific
frequency is measured, different settings are available.
IF BW
Specifies the measurement filter bandwidth.
Ensure the entire input signal lies within the specified bandwidth, particularly for narrow
bandwidths.
Note:
Adapting the frequency in autotune mode.
The autotune function sets the measurement filter position such that the detected fre-
quency is in the center of the filter bandwidth. While the frequency is locked, the filter
position remains unchanged. If the bandwidth is narrow and the signal frequency
changes, e.g. due to changes of the transmitter, the signal may no longer be covered
completely by the measurement filter. In this case, the measurement results are distor-
ted. If you assume the ILS signal frequency might have changed, we recommend per-
forming a new search using the
Remote command:
1F/2F measurements:
Wideband measurements:
IF BW Dist/ID
Specifies the demodulation filter bandwidth for distortion and ID measurements.
Remote command:
1F/2F measurements:
Wideband measurements:
Res. FM Filt. (ILS only)
Defines the filter type used to determine residual FM (see
"ICAO"
Filter according to ICAO specification
"Narrow"
Narrow filter; the DDM filters used to determine the 90
Hz/ 150
Hz
modulation values are used to avoid interference between the signals
Remote command:
4.1.4.5
LF Input Configuration
The ILS Localizer and Glidepath measurements can be performed on common RF or
on LF input. LF input can only be analyzed if the R&S
EVSG1-K7 option is installed.
ILS Localizer and ILS Glidepath (GP) Modes