Rohde & Schwarz EVSF1000, User Manual

Page: 52 / 295

Numeric Measurement Modes
R&S
®
EVSF1000
52 User Manual 1178.6410.02 ─ 05
CH
Sets the receiver frequency channel on the active receiver board according to the
ICAO frequency list.
Remote command:
RFCH
on page 183
Freq
Sets the nominal frequency for the measurement. By default, this frequency is also
assumed to be the center frequency for spectrum displays, unless an offset is defined.
For measurements on two frequencies, the frequencies are defined as offsets to this
nominal frequency.
Remote command:
RF
on page 183
Step Size
Defines the frequency step size for the rotary knob when setting the frequency.
In many avionics signals, channels are assigned to frequencies with a fixed offset. By
setting the step size of the rotary knob to the fixed offset, you can easily scroll through
the signal's channel frequencies using the rotary knob. Thus, for example, you can
analyze the measurement results for one channel after the other simply by changing
the selected channel frequency with the rotary knob.
The default step size for ILS/VOR mode is 50 kHz.
6.1.4.2 Ampt
Access VNC : [w]
The following settings define the amplification for the input signal.
RF Att ............................................................................................................................ 52
RF Mode ....................................................................................................................... 53
Transducer Correction ...................................................................................................53
RF Att
Determines how the attenuation of the RF signal is defined. The attenuation should be
adjusted such that the measured power level remains in the valid level range (indicated
by the green area of the bargraph, see
Chapter 6.1.3.1, "RF Level and Frequency Dis-
play" , on page 38). Note that the valid level range depends on the selected measure-
ment mode.
"Manual" The RF attenuation mode is specified manually (see "RF Mode"
on page 53).
ILS Localizer and ILS Glidepath (GP) Modes