Safran CORTEX CRT Quantum - Output Frequency; Table 33: Examples of Uplink Converter Setup

COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
© Safran Data Systems
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Page 213
3.8.2.1. Output Frequency
The frequency domain can be:
 60 to 78 MHz for IF legacy operation. In this case, the EFC programs automatically the bypass
function
 950 to 2400 MHz for L/S-Band Operation.
Important Note
Please note that,
 To obtain an accurate output frequency, there are two parameters to be set:
 The Output frequency of the IF Modulator (with an accuracy of the Microhertz) for the up
conversion from base band to intermediate band
 The RF converter frequency (with 5MHz step*) for up conversion from intermediate band to L/S
band
The IF frequency shall be adapted accordingly to the RF frequency.
The formulas given the RF converter frequency and the IF frequency are:
EFC converter frequency = the multiple of 5MHz nearest to the RF output frequency
IF frequency = 70MHz + (RF output frequency – EFC converter frequency)
*Remark: The local oscillator used on the EFC board has been chosen to guarantee a good phase noise. In
return the frequency step of the oscillator is 5 MHz.
Here below some examples of uplink conversion setup:
RF output signal
frequency
EFC converter
frequency
IF signal frequency
IFM
output
frequency
2300 MHz
2300 MHz
70 + 2300 – 2300 = 70 MHz
70 MHz
1211 MHz
1210 MHz
70 + 1211 – 1210 = 71 MHz
71 MHz
952,3 MHz
950 MHz
70 + 952,3 – 950 = 72,3
MHz
72,3 MHz
Table 33: Examples of uplink converter setup