Safran CORTEX CRT Quantum - Reference Clock Interface

COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
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Page 215
3.8.4. Reference Clock Interface
Without EFC, both the external reference 1 and 2 are connected to the main signal processing board of the CRT.
With the EFC,
 The external reference 1 is no longer connected to the main signal processing board of the CRT but is
connected to the EFC board.
 The external reference 2 is still connected to the main signal processing board of the CRT
 The EFC board supply a reference 10MHz to the main signal processing board of the CRT
Here below are the different possibilities according to the CRT reference frequency setup (Internal, External input
1, External input 2 or External input 1 or 2):
 Case 1: « Reference frequency » = « Internal »
Both EFC and MSP boards use the internal
reference of the EFC board.
 Case 2: « Reference frequency » = « External Input 1 »
One external reference is connected to “EXT 1”
Both EFC and MSP boards use the external
reference 1
No external reference is connected to “EXT 1”
Both EFC and MSP boards use the internal
reference of the EFC board.
 Case 3: « Reference frequency » = « External Input 2 »