Avionic standards
R&S
®
SMA100B
136User Manual 1178.3834.02 ─ 09
"ICAO"
Activates variation in predefined steps according to standard VOR
transmitting frequencies (see Table 6-1). The start value can be
selected in the field "ICAO Channel".
Remote command:
[:SOURce<hw>]:VOR:FREQuency:MODE on page 631
Carrier Frequency
Requires "Carrier Frequency Mode > User Defined".
Sets the carrier frequency of the signal.
Remote command:
[:SOURce<hw>]:VOR:FREQuency on page 630
ICAO Channel
Requires "Carrier Frequency Mode > ICAO".
Sets the ICAO channel and the corresponding transmitting frequency.
If avionic standard modulation is activated and you change the "RF Frequency", the
frequency value of the closest ICAO channel is applied automatically. The "ICAO
Channel" is also updated.
For an overview of the VOR ICAO channel frequencies, see Table 6-1.
Remote command:
[:SOURce<hw>]:VOR:ICAO:CHANnel on page 631
EXT AM
Enables/disables additional modulation from an external source. The external signal is
input via the Ext connector.
"Off"
Selects the internal modulation source for the avionic standard modu-
lation.
"EXT (MOD AM)"
Selects the external source. The external signal is added to the inter-
nal signal. Switching off the internal source is not possible. The exter-
nal signal is input via the Ext connector. The sensitivity is 10 mV per
percent modulation depth.
Note: There can be an overmodulation as a function of the level of
the external signal without a corresponding caution message being
generated. To avoid an overmodulation, the peak value of the exter-
nal signal is to be delimited corresponding to the sum of the modula-
tion depths of the remaining VOR signal components.
Remote command:
[:SOURce<hw>]:VOR:SOURce on page 626
VOR configuration and settings
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