SME Analog Modulations
1038.6002.02 2.73 E-13
150 Hz Amplitude modulation of the output signal with the 150-Hz
signal content of the ILS-LOC signal. The modulation depth
of the 150-Hz signal results from the settings of parameters
SUM OF DEPTH (SOD) and DDM according to:
AM (150 Hz) = 0,5 × (SOD DDM × 100%)
IEC-bus command
SOUR:ILS:STAT ON; TYPE LOC; LOC: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-LOC modulation signal. The
DDM value is calculated according to the following formula
(parameter LEFT/RIGHT = RIGHT):
DDM = [ AM(90 Hz) AM (150 Hz) ] / 100%
If LEFT of parameter LEFT/RIGHT is selected, negative DDM values
result with otherwise same setting. A variation of the DDM value
automatically leads to a variation of the DDM value in dB and the
value of the instrument current.
IEC-bus command SOUR:ILS:LOC: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:LOC:DDM:CURR 0
DDM
Input of the DDM value in dB.
A variation of the DDM value in dB automatically leads to a variation
of the value of the instrument current and of the DDM value. The dB
value is calculated according to:
DDM dB = 20 × LOG [(SOD+DDM×100%) / (SOD-DDM×100%)]
IEC-bus command SOUR:LOC:DDM:LOG 0
FLY
Selection between ILS-LOC operating modes LEFT and RIGHT. A
change of the setting automatically changes the sign of the DDM
value.
LEFT In the LEFT operating mode, the content of the 150-Hz
modulation signal is predominant. The DDM value is
negative.
RIGHT In the RIGHT operating mode, the content of the 90-Hz
modulation signal is predominant. The DDM value is
positive..
IEC-bus command SOUR:ILS:LOC:DDM:DIR LEFT
SUM OF DEPTH
Input value of the arithmetic sum of the modulation depths of 90-Hz
and 150-Hz ILS-LOC signal contents. The RMS modulation depth
depends on the phase setting of both modulation tones.
IEC-bus command SOUR:ILS:LOC:SOD 40PCT
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