COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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It cannot be duplicated or distributed without expressed written consent.
3.3.1.4. IF Level Measurement
For PM, direct PCM/PM and coherent AM demodulation, the measured IF level is the level of the remnant carrier.
For BPSK, QPSK, OQPSK, SOQPSK, GMSK, AQPSK, the measured IF level is the signal energy. For FM and
non-coherent AM demodulation, the IF level is measured within the the pre-detection bandwidth.
3.3.1.5. Low Bandwidth TMU
For low bandwidth applications (PCM/BPSK/PM, BR < 25 kbps and SCF < 128 kHz), the Bit Synchronizer can
operate in two modes: Normal mode or Extended mode.
In the Normal mode, the Bit Synchronizer features a standard PLL for regenerating the
PCM clock.
In the Extended mode, the Bit Synchronizer regenerates the PCM clock from the BPSK
sub-carrier. This mode requires that the PCM clock and the BPSK sub-carrier are
synchronous (derived from the same reference clock).
The Extended mode should be selected whenever the PCM transition rate is not sufficient to maintain the PLL
locked in Normal mode (NRZ PCM code with long series of zeros or ones).
The operating mode can be changed in the Windows registry (for more details, see also Section 4.2.8.3).
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