Rack-Mount RDMS
TM
Telemetry Receiver
93
Quasonix, Inc.
Figure 164: On-Screen Buttons
The on-screen buttons work the same way as the buttons on the Basic Settings tab. Refer to section 4.2.3.1.1.2 for
additional details.
In addition, both Channel windows include a Factory Reset screen button, located in the bottom right corner of each
Channel window. The Factory Reset button is used to reset all settings, EXCEPT Ethernet settings, for a selected
Channel to their factory default values. If the Diversity Combiner is active, both Channels are reset.
4.2.3.1.2.2 Modulation Scale Settings Window
The Modulation Scale Settings window is shown in Figure 165. When the modulation is set to PCM/FM, the Scale
Settings window includes settings for modulation scaling and video scaling indexes. In any other mode, the Scale
Settings are not available.
Figure 165: Modulation Scale Settings Window
The Mod Scaling option allows the operator to manually set the modulation scale index. This enables the receiver to
operate at the optimum range of modulation desired by the user.
Modulation Persistence allows the current state of the Modulation Scaling setting to be retained following a power-
off cycle. The default value is Off (not checked).
When modulation scale index is set, the Modulation Scaling option on the Basic Settings screen is simultaneously
changed to Locked. The Locked notation includes the new index number that the operator has chosen (shown in
Figure 165).
If the Locked index number is to be retained following a power-off cycle of the rack, then turn on Modulation
Persistence by checking the Modulation Persistence box on the Basic Settings screen. Save the current setup profile
using the Save Presets option. Refer to section 4.2.8.1, Save/Load Presets.
The purpose of the Mod Scale Hold Threshold option is to set a signal-to-noise ratio (SNR) level (technically
Eb/N0* level) below which the modulation index estimate will hold rather than track, so it does not get perturbed by