Rohde & Schwarz EVSF1000, User Manual

Page: 51 / 295

Numeric Measurement Modes
R&S
®
EVSF1000
51 User Manual 1178.6410.02 ─ 05
Clearance
Defines the clearance carrier as a frequency offset from the nominal frequency in the
opposite direction to the course carrier.
1F Offset
For single frequency measurements only:
Defines an offset of the measured frequency to the nominal frequency.
Remote command:
LLZ_DEMFREQS_OFFSET_1F
on page 207
GS_DEMFREQS_OFFSET_1F
on page 213
Find Carrier
For manual carrier determination only:
Determines the carrier frequencies automatically, but only once. The frequencies do
not change automatically if the input signal changes.
Remote command:
LLZ_START_FINDCARRIER
on page 209
GS_START_FINDCARRIER
on page 213
Carrier Thresh
Defines a threshold for automatic carrier determination (once or continuously). The
measured power level at a frequency other than the current carrier must exceed this
level before the carrier frequency is adapted. This is useful for noisy or unstable sig-
nals so the carrier frequencies do not change unnecessarily often due to minor distur-
bances.
Remote command:
GS_CARRIER_THRESHOLD_DB
on page 211
LLZ_CARRIER_THRESHOLD_DB
on page 206
Upper Freq
The course and clearance carriers are defined as offsets to either side of the center
frequency. Which frequency is considered to be the course carrier - the upper or lower
frequency - depends on the used standard and the country it is used in. Thus, you can
swap the carrier definition if necessary.
Remote command:
SETUP:UNIT:UPPERFREQ
on page 188
Channel Frequency Configuration (CH FREQ)
Access VNC : [q]
The channel frequency determines the nominal frequency at which the measurement is
performed. For some avionics standards, the channels are associated with specific fre-
quencies. (See
Chapter A, "ILS Channel Frequency List" , on page 275 and Chapter B,
"VOR Channel Frequency List" , on page 277.)
CH ................................................................................................................................. 52
Freq ...............................................................................................................................52
Step Size .......................................................................................................................52
ILS Localizer and ILS Glidepath (GP) Modes