Post -Dcombiner; Post-D - Best Channel; Post-D In Optimum Mode - Safran CORTEX RTR NeXt Series User Manual

6.6 Post-D combiner.
Post D combiner is advised when using frequency diversity in FM mode.
Using the post D combiner, for proper combining, the maximum delay between the RF inputs
should not exceed 20% of bit duration (At 10 Mbit/s, this is 20 ns), taking into account:

The embedded delay on :

The embedded delay on :

In case of space diversity :
Post-D – best channel.
6.6.1
In this case, the two demodulated signal are only switched taking into account the AGC
information. This mode is used while transmitting data.
6.6.2

Post-D in optimum mode.

In this case, the two demodulated signal are weighted by the AGC information and summed. This
mode is used while transmitting an analog signal in FM (Typically a video signal). Due to
nonlinear behavior of FM modulation, when transmitting PCM, no gain is observed in optimum
mode and the best channel mode is recommended.
© Safran Data Systems – IMP000074 e14r1
Radio Telemetry Receiver
User's Manual
The PCM data streams.
-
- The RF cables towards the TX antenna.
The RF cables from the antenna to the receivers.
-
The propagation delay between the two antennas.
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It cannot be duplicated or distributed without expressed written consent.
Ref. D104004
Is.Rev
Previous Ref.:
Date:
Safran Data Systems
This document is the property of
07
DTU000567
21/06/2021
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