3
rd
Generation Rack-
Mount RDMS™
39
Quasonix, Inc.
Locked index numbers, manually or automatically selected, are lost when the Mod Scaling option is set to Tracking,
Off, or Acquire. If the Locked index number is to be retained following a power-off cycle of the rack, then turn on
the Mod Persist option via the Main Menu. Refer to section 4.4.2.13, Modulation Persistence.
4.4.2.12.3 Modulation Scaling
–
Off
The Mod Scaling Off setting is shown in Figure 48. When Modulation Scaling is set to Locked, the graphing eye
pattern is displayed in GREEN, indicating the optimal modulation index is set.
Figure 48: Main Menu, Modulation Scaling
–
Off
Figure 49: Green Eye Pattern Display
–
Off
With Mod Scaling turned Off, the Mod Index is set to the optimal 0.700. Mod Scaling should be turned off when a
new generation, digitally synthesized transmitter is the source. Digitally synthesized transmitters do not have a
variable deviation sensitivity adjustment, and as such are not subject to inaccurate modulation index settings
4.4.2.12.4 Modulation Scaling
–
Acquire
When the RDMS™ is
powered on, the default setting is Acquire, unless the unit was powered off from a preset
condition. Acquire mode has two states: Armed and Triggered. When Modulation Scaling is set to Acquire, in the
absence of signal, the eye pattern will turn Yellow, as shown in Figure 51, the state is set to Armed. In Armed state,
modulation scaling operates continuously.
Figure 50: Main Menu, Modulation Scaling
–
Acquire
Figure 51: Yellow Eye Pattern Display
–
Acquire
