Figure 5: Downlink Input Signal Selection - Safran CORTEX CRT Quantum User Manual

1.4.2.2.2. Downlink Input Signal Selection
Up to four IF carriers can be simultaneously demodulated (IF Receivers 1, 2, 3 & 4) with limitations (data rate,
bandwidth ...) that are described in Section 3. Selection of the IF or Auxiliary signals is by analog or digital
switches as shown in next figure:
NOMINAL
ALTERNATE
NOMINAL
ALTERNATE
NOMINAL
ALTERNATE
AUXILIARY 1
AUXILIARY 2
On the MSP board, each IF Receiver can be separately programmed to receive: IF-1 or IF-2 or IF-3 or Auxiliary-1
or Auxiliary-2.
Each analog switch on the Main Signal Processing board (IF # 1, IF # 2 and IF # 3) allows to select a NOMINAL
or ALTERNATE IF signal.
AUXILIARY input stages have limited hardware (no amplification, no filtering, no AGC). They only allow to
receive noise-free signals with low amplitude variations (typically: test loops at baseband or IF, Telecommand
data demodulation, etc...).
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
IF STAGE # 1
IF STAGE # 2
IF STAGE # 3
AGC

Figure 5: Downlink Input Signal Selection

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It cannot be duplicated or distributed without expressed written consent.
AGC A/D
AGC A/D
A/D
A/D
A/D
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec. 03, 2021Sept.
30, 2021
IF RECEIVER # 1
IF RECEIVER # 2
5 x 4
DIGITAL
MATRIX
IF RECEIVER # 3
IF RECEIVER # 4
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