Rack-Mount RDMS
TM
Telemetry Receiver
28
Quasonix, Inc.
Figure 33: Main Menu, Derandomizer Setting
4.1.4.9
Force Break Lock (PSK Modes Only)
The RDMS™ provides very rapid, robust synchronization. Nevertheless, it is possible that the demodulator declares
a lock, yet the output data appears to be incorrect. This can happen when there is significant interference, for
example. The Force Break Lock parameter allows the user to break the demodulator’s signal lock condition, forcing
it to reacquire signal lock.
To activate the Force Break Lock and reacquire a signal lock, use the down arrow key on the front panel keypad to
scroll to the Force Break Lock. Press the Enter key to continue.
Figure 34: Main Menu, Force Break Lock
4.1.4.10 Modulation Scaling (PCM/FM Mode Only)
Modulation Scaling is a method used to retain the maximum trellis coding gain of a non-ideal FM signal. There are
four possible settings: Tracking, Locked, Off, or Acquire.
4.1.4.10.1 Modulation Scaling - Tracking
When the RDMS™ is powered on, the default setting is Tracking, unless the unit was powered off from a preset
condition. If the unit was powered off from an unmodified preset setting, then the default condition of Modulation
Scaling is as defined in the preset. When Tracking is set, the modulation scale index is actively being tracked.
Note:
The active setting is not saved when the rack is powered off, unless the Mod Persist option was set to On.