A2537-002/01 February 2020 6-12 SEMCO Proprietary Information
Using the remote GUI, the user clicks on Advanced Settings, which accesses an I/Q Interleave window
and provides for toggling ON/OFF as shown in Figure 6-20.
Figure 6-20
I/Q Interleaving Selection on Remote GUI
6.7 Auto Demodulator Settings
Auto Settings are automatically programmed into the demodulator and embedded bit synchronizer when
certain demodulation formats are selected. These automatic settings are based on data rates and
demodulator characteristics required for optimum performance in most all telemetry missions and facilitate
quick mission set-up without extensive user knowledge and intervention.
The Auto settings are available for the following demodulator performance characteristics:
A. Bandwidths - This automatically sets the following demodulator bandwidths:
(1) Embedded Bit Synchronizer Loop Bandwidth % - Automatically calculates and sets the loop
bandwidth value (BW%) of the embedded Bit Synchronizer. Changing this value affects the ability
of the Bit Synchronizer to lock on the demodulated waveform. In general terms, a narrower
bandwidth provides for a lower lock threshold. A wider bandwidth is more tolerant of waveform
anomalies but will require a higher C/N threshold to lock. The Auto Bandwidths feature
automatically calculates and sets an optimum value that provides for a lock threshold that applies
to most data rates and demod formats
(2) Demodulator (Carrier) Loop Bandwidth% - Normally, the narrowest bandwidth that still provides
demodulator lock is most desired, because this provides the lowest C/N lock threshold possible.
However, it is sometimes desirable to widen this loop bandwidth value to make the demodulator
more tolerant of transmitter jitter and low frequency noise that is found to be present on the
telemetry downlink signal. Here again, a wider demodulator loop bandwidth will require a higher
C/N threshold to lock. The Auto Bandwidths feature calculates and sets an optimum value that
provides for a lock threshold that applies to most data rates and demod formats.
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