R&S SMA100B User Manual

Avionic standards
R&S
®
SMA100B
151User Manual 1178.3834.02 ─ 09
A variation of the value automatically leads to a variation of the DDM value and the
instrument current.
Remote command:
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:LOGarithmic on page 606
DDM Percent
Sets the difference in depth of modulation between the upper lobe (90 Hz) and the
lower lobe (150 Hz) tone of the ILS glide slope modulation signal.
The DDM value in percent is calculated as follows:
●
"DDM Polarity > 90 Hz - 150 Hz":
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 value of the
instrument current and the DDM value in dB.
Remote command:
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:PCT on page 606
DDM - SDM Coupling
Selects if the DDM value is fixed or is changed with a change of sum of modulation
depths (SDM, see below).
"Fixed DDM"
The absolute DDM value stays constant, if the SDM is changed.
"Coupled to SDM"
The absolute DDM value changes, if the SDM is changed. The DDM
value expressed in dB stays constant.
Remote command:
[:SOURce<hw>]:ILS[:GS|GSLope]:DDM:COUPling on page 605
6.4.3 ILS localizer settings
Access:
1. Select "ILS > General".
2. Select "ILS Component > Localizer".
Settings
● General settings....................................................................................................152
● Signal settings.......................................................................................................154
● Amplitude settings.................................................................................................155
● COM/ID settings....................................................................................................158
ILS configuration and settings

R&S SMA100B Specifications

General

Brand	R&S
Model	SMA100B
Category	Portable Generator
Language	English