Uplink Digital Filter; General; Filter Characteristics - Safran CORTEX CRT Quantum User Manual

Uplink Digital Filter

3.4.4.

3.4.4.1. General

On the Cortex CRT XL units, the IF Modulator has a configurable Digital IF Bandpass Filter. This filter is not
available on Cortex CRT XL2 units.
The Digital IF Filter is designed for use in Video modulation scheme (PM or FM modulation).
The Digital IF Filter is not designed for use in Direct PCM modulation (PM/PCM, BPSK, QPSK, OQPSK). For
Direct PCM modulation, the use of Pulse Shaping filters is recommended (Root Raised Cosine, Raised Cosine).

3.4.4.2. Filter Characteristics

Six filters are pre-configured and eight filters are available for Custom design.
The pre-configured filters are identified by a "label" corresponding to the half-bandwidth at 0.1 dB attenuation.
The curves below show the half-band response of each filter:
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Figure 65: "125 kHz" filter, -3 dB bandwidth: 1.36 MHz
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Safran Data Systems
.
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
Page 128