SME Analog Modulations
1038.6002.02 2.69 E-13
150 Hz Amplitude modulation of the output signal with the 150-Hz
signal content of the ILS-GS signal. The modulation depth of
the 150-Hz signal results from the settings of parameters
SUM OF DEPTH (SOD) and DDM acc. to:
AM (150 Hz) = 0,5 × (SOD DDM × 100%)
IEC-bus command SOUR
:ILS:STAT ON; TYPE GS; MODE
NORM
DDM
Difference in D
epth of Modulation. Input value of the difference in depth
of modulation between the 90-Hz and the 150-Hz tone of the ILS-GS
modulation signal. The DDM value is calculated to formula (parameter
UP/DOWN = DOWN):
DDM = [ AM(90 Hz) - AM(150 Hz) ] /100%
A variation of the DDM value automatically leads to a variation of the
value of the instrument current and the DDM value in dB.
IEC-bus command SOUR:ILS:DDM 0
DDM
Input value of the current of the ILS indicating instrument corresponding
to the DDM value. A variation of the value of the instrument current
automatically leads to a variation of the DDM value and the DDM value
in dB. The value of the instrument current is calculated according to:
DDM µ A = DDM × 857,1 µ A
IEC-bus command SOUR:ILS:DDM:CURR 0
DDM
Input of the DDM value in dB. A variation of the value automatically
leads to a variation of the DDM value and the value of the instrument
current. The dB value is calculated according to:
DDM dB = 20 × LOG [(SOD+DDM×100%) / (SOD-DDM×100%)]
IEC-bus command SOUR:ILS:DDM:LOG 0
FLY
Selection between ILS-GS operating modes UP and DOWN. A change
of the setting automatically changes the sign of the DDM value.
UP In operating mode UP, the 150-Hz modulation signal is
predominant, the DDM value is positive.
DOWN In operating mode DOWN, the 90-Hz modulation signal is
predominant, the DDM value is negative.
IEC-bus command SOUR:ILS:DDM:DIR UP
SUM OF DEPTH
Input value of the arithmetic sum of the modulation depths of the 90-Hz
and 150-Hz ILS-GS signal contents. The RMS modulation depth of the
sum signal depends on the phase setting of both modulation tones.
IEC-bus command SOUR:ILS:SOD 80PCT
UP FREQ
Input value of the modulation frequency of the antenna lobe arranged at
the top.
IEC-bus command SOUR:ILS:ULOB 90
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