OPTION 006 Avionics
Annex-B-10
Tone suppression
The 90 Hz or 150 Hz tone can be suppressed when either the SDM or DDM display box
is selected for data entry, using the [Suppress ON/OFF] key. This will result in the non-
dominant tone being suppressed without altering the SDM or DDM (% or index) as shown in
Fig. B-7. Selecting [Suppress 90/150] will change the tone to be suppressed. The modulation
depth value of the active tone is displayed under the SDM setting.
Fig. B-7 Tone suppression menu
Communication channel testing
ILS systems allow the provision of an emergency voice channel on localiser frequencies.
This channel can be tested by selecting the [Ident/Comms] key to produce a display similar to the
one shown in Fig. B-8.
RF
Level
AM2
Depth
Source
Freq. F4
AM2
ON/OFF
Select
Source
Carrier
Freq.
Avionics
Modes
DDM
SDM
LOCAL
Carrier :
Freq.
RF Level :
SDM:
ILS Rate : 30.0 Hz
dBm
ILS ZERO DDM
MHz
Int Std: 10 MHz
108.100 0000
- 144.0
40.0%
ON
C1126
AM2 :
Int F4 : 1.0000 kHz
ON
0.0%
LOC/GS
Freq.
Modulation ENABLED
Fig. B-8 Ident/Comms selected
In this mode a fixed 0% DDM signal is provided and an additional modulation signal can
be added using the [AM2 Depth] key. The source of this additional modulation can be set using
the [Select Source] key. If internal modulation is selected the source frequency can be modified
using the [Source Freq.] key. Selecting [DDM] will return the instrument to normal ILS mode.
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