Safran CORTEX CRT Quantum - Page 52

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 27
1.6.2. IF Modulation
 Number of IF Modulator boards 1 or 2 (IFM-1, IFM-2)
 Modulation FM, PM, BPSK, QPSK, OQPSK, AQPSK, 8PSK
 Carrier frequency (CRT XL Quantum)
60.0 to 78.0 MHz
 Carrier frequency (CRT eXplorer)
60.0 to 78.0 MHz (226 to 234 MHz as option)
 Carrier frequency resolution 14 pHz (250 MHz / 264)
 IF output bandwidth 50-90 MHz (- 3 dB bandwidth)
 Modulating signal Internal and external analog video signals (base band)
Internal or external PCM data streams
 External analog input 2 Vpp / 50 Ω
 PCM modulation filtering None, Raised or Root Raised & roll-off factor
 Frequency deviation 0 to ± 5 MHz
 Modulation index 0 to 2.5 radians
 IF output ports (per IFM) 2 (Nominal & Test)
 Output level Nominal output : 0 to - 80 dBm
Alternate output : - 20 dBm
 Output level setting accuracy ≤ ± 1 dBm (Nominal port, from 0 to -50 dBm, at 70 MHz)
 Output impedance / VSWR 50 Ω / ≤ 1.30
 Carrier frequency stability As per the reference clock (internal or external)
 Unwanted emissions ≤ - 60 dBc, from 0 to -20 dBm output level
 IF phase noise (CRT XL Quantum)
-43.5 dBc/Hz at 10 Hz, falling to -120 dBc/Hz at 1 MHz
≤ 0.5° RMS in 1-MHz bandwidth (0.2° typical)
 IF phase noise (CRT eXplorer)
-70 dBc/Hz at 10 Hz, falling linearly to -120 dBc/Hz at 1 MHz
≤ 0.5° RMS in 1-MHz bandwidth (0.2° typical)
 Carrier sweep range ± 1 to ± 1,000 kHz
 Carrier sweep rate 1 Hz/s to 175 kHz/s
 Carrier sweep offset 0 to 1 MHz (signed)
 Sweep step NCO refreshed every microsecond