R&S SMA100B - Page 148

Avionic standards
R&S
®
SMA100B
148User Manual 1178.3834.02 ─ 09
"90 Hz"
Amplitude modulation of the output signal with the upper lobe signal
component (90 Hz signal content) of the ILS glide slope signal.
The modulation depth of the 90 Hz signal results from the settings of
the parameters Sum of Depth and DDM Depth according to:
●
"Fly > Down"
AM (90 Hz) = 0.5 × (SDM + DDM × 100 %)
●
"Fly > Up"
AM (90 Hz) = 0.5 × (SDM - DDM × 100 %)
"150 Hz"
Amplitude modulation of the output signal with the lower lobe signal
component (150 Hz signal content) of the ILS glide slope signal.
The modulation depth of the 150 Hz signal results from the settings of
parameters Sum of Depth and DDM Depth according to:
●
"Fly > Down"
AM (150 Hz) = 0.5 × (SDM + DDM × 100 %)
●
"Fly > Up"
AM (150 Hz) = 0.5 × (SDM - DDM × 100 %)
Remote command:
[:SOURce<hw>]:ILS[:GS|GSLope]:MODE on page 609
DDM Polarity
Defines the polarity for DDM calculation (see "DDM Depth" on page 150).
Remote command:
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:POLarity on page 606
Up Frequency
Sets the modulation frequency of the upper antenna lobe.
Remote command:
[:SOURce<hw>]:ILS[:GS|GSLope]:ULOBe[:FREQuency] on page 611
Down Frequency
Sets the modulation frequency of the lower antenna lobe.
Remote command:
[:SOURce<hw>]:ILS[:GS|GSLope]:LLOBe[:FREQuency] on page 609
Up/Down Phase
Sets the phase between the modulation signals of the upper and lower antenna lobe.
The zero crossing of the lower lobe (150Hz) signal serves as a reference. The angle
refers to the period of the signal of the lower antenna lobe.
Remote command:
[:SOURce<hw>]:ILS[:GS|GSLope]:PHASe on page 609
ILS configuration and settings