Rohde & Schwarz SMA100B - COM;ID Settings

Avionic Standards
R&S
®
SMA100B
141User Manual 1178.3834.02 ─ 05
DDM Logarithmic
Sets the DDM value in dB. The dB value is calculated according to:
DDM dB = 20 × LOG [(SDM + DDM × 100 %) / (SDM - DDM × 100 %)]
A variation of the value automatically leads to a variation of the DDM value and the
instrument current.
Remote command:
[:SOURce<hw>]:ILS:LOCalizer:DDM:LOGarithmic on page 564
DDM Percent
Sets the difference in depth of modulation between the signal of the left lobe (90 Hz)
and the right lobe (150 Hz).
The DDM value in percent is calculated by the following formulas:
●
"DDM Polarity > 90 Hz - 150 Hz" (default setting):
DDM = [ AM(90 Hz) - AM (150 Hz) ]
●
"DDM Polarity > 150 Hz - 90 Hz":
DDM = [ AM(150 Hz) - AM (90 Hz) ]
A variation of the DDM value automatically leads to a variation of the DDM value in dB
and the value of the instrument current.
Remote command:
[:SOURce<hw>]:ILS:LOCalizer:DDM:PCT on page 564
5.4.3.4 COM/ID Settings
Access:
1. Select "ILS Component > Localizer", see Chapter 5.4.3, "ILS Localizer Settings",
on page 134.
2. Select "ILS > COM/ID".
ILS Configuration and Settings