GBAS/SCAT-I Mode (Options R&S
EVSG-K4/-K5)
R&S
®
EVSG1000
191
User Manual 1178.6227.02 ─ 06
6.4.3
Amplitude Configuration
Access
: [AMPT]
Access VNC
: [w]
The following settings define the amplification for the input signal.
RF Att
Determines whether the RF attenuation is defined automatically or manually.
"Manual"
Select the
manually.
For signals with mostly constant signal levels, it is recommended that
you select the optimal mode manually.
"Auto"
The optimal mode is selected automatically according to the input sig-
nal strength.
In difficult receiving conditions, for example the presence of high-level
interferers or areas with strong multi-path conditions, selecting the
suitable attenuation mode manually can lead to more stable mea-
surement results.
If the R&S
EVSG1000 has to adapt the attenuation frequently, indica-
ted by a frequent clicking noise from the attenuator, spikes can occur
in the trace.
Remote command:
GBAS:ATTMODE AUTO
, see
RF Mode
Defines the RF attenuation mode to be used.
"Low Noise"
15 dB pre-amplification
Provides a high sensitivity. Suitable when scanning the area for dis-
tant signals.
"Norm"
0 dB
Provides a normal sensitivity.
"Low Dist"
15 dB attenuation
Provides a low sensitivity. Suitable when analyzing a nearby signal, to
avoid overload due to high-level signals.
Remote command:
6.4.4
Bandwidth Configuration
Access
: [BW]
Access VNC
: [e]
IF Filter
The IF filter determines the bandwidth on which the measurement is performed. The
default filter bandwidth is 16.8
kHz. For GBAS/SCAT-I measurements, the complete
channel bandwidth is 25
kHz.
GBAS/ SCAT-I Measurement Configuration