HIGH DATA RATE RECEIVER
HDR-4G+ USER’S MANUAL
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
© Safran Data Systems – IMP000074 e14r1
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Moreover, the system can be in different states:
- N/A if Channel A or Channel B has been chosen as output of the DCU.
- Unlocked if the output is set to combining, and both demodulators are unlocked.
- Single channel if only one demodulator is locked.
- Acquisition if both demodulators are locked, and the system searches for a fit between both
signals. The system identifies the differential ambiguity between both signals.
- Locked if combining is performed normally.
- Check if the system verifies the differential ambiguity found during the acquisition phase. This
happens when the observed combining gain is lower than the theory by more than 0.3dB. This
is also the normal working state when “Best channel” mode is selected.
Specific attention should be paid to the following points otherwise warnings will be issued:
- modulations must be identical, and must be one of the following: QPSK, OQPSK, 8PSK.
- bitrates must be identical.
- PCM codes must be identical.
- IF inputs must be different (no gain can be achieved with the same signal feeding both inputs).
- Configuration of matched filters must be identical (data paths before the DCU must be
equivalent).
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