Pre Dcombiner - Safran CORTEX RTR NeXt Series User Manual

6.2 Pre D combiner
The pre D combiner is used to:

Put the two channels in phase

Sum the two signals under weighting

Compensate high rate fading
Pre D combiner block diagram:
The Numerically Controlled Oscillators n°1 and n°2 put the two channels in phase.
The sum is weighted using the parameters α1 and α2.
Pre D combiner setting:

Selecting "Optimum", the pre-D combiner schematics is as described on the above schematics.

Selecting "Best", the pre-D combiner output selects the signal with the highest level

Selecting "Optimum criterion", the combiner stops combining as soon as it does not improve the signal.
Adapted to Frequency diversity and for a maximum bitrate of 1Mbps.
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Radio Telemetry Receiver
User's Manual
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Ref. D104004
Is.Rev 07
Previous Ref.: DTU000567
Date: 21/06/2021
Safran Data Systems
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Page 58