Analog Modulations SME
1038.6002.02 2.64 E-13
PREEMPHASIS
Selection of the preemphasis of the audio signal.
50 uS Preemphasis 50 µs
75 uS Preemphasis 75 µs
OFF Preemphasis switched off
IEC-bus command SOUR:STER:AUD:PRE OFF
PILOT STATE
Switching on/off the pilot tone.
IEC-bus command SOUR:STER:PIL:STAT OFF
PILOT DEVIATION
Input value of the frequency deviation of the pilot tone.
IEC-bus command SOUR:STER:PIL 6720
PILOT PHASE
Input value of the phase of the pilot tone. The zero point of the suppressed
38-kHz subcarrier of the STEREO multiplex signal serves as phase reference.
IEC-bus command SOUR:STER:PIL:PHAS 0
ARI DEVIATION
Input value of the deviation content of the unmodulated 57-kHz-ARI subcarrier
in the ARI operating mode.
IEC-bus command SOUR:STER:ARI 4kHz
ARI IDENTIFICATION
Selection between ARI broadcasting code (DK) and traffic area code (BK).
OFF The area code and the broadcasting code are switched off.
DK The broadcasting code is activated.
The AM modulation depth of the broadcasting code (125 Hz) on the
ARI subcarrier is m=0.3.
BK The area code is activated.
The AM modulation depth of the area code chosen under ARI BK is
m=0.6.
IEC-bus command SOUR:STER:SIGN ARI; ARI:TYPE DK
ARI BK
Selection of the standard traffic area codes.
A Traffic area code A, 23,7500 Hz
B Traffic area code B, 28,2738 Hz
C Traffic area code C, 34,9265 Hz
D Traffic area code D, 39,5833 Hz
E Traffic area code E, 45,6731 Hz
F Traffic area code F, 53,9773 Hz
IEC-bus command SOUR:STER:SIGN ARI; ARI:TYPE BK; ARI:BK A
2.6.2.7 VOR- / ILS-Test Signals
By means of option SM-B6, multifunction generator, test signals for avionics systems
• VOR (VHF Omnidirectional Range) ,
• ILS (Instrument Landing System) and
• MKR-BCN (Marker Beacon) can be generated.
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