7-4
Section 7: System Description
Moseley SL9003Q
602-12016-01 Revision J
The resulting carrier is translated up to 70 MHz by the IF Upconverter daughter card
(located in the same module). This is accomplished by a standard mixing of the carrier with
a phase-locked LO. A 70 MHz SAW filter provides a spectrally-clean output signal.
7.2.4 Transmit Module (Upconverter)
12.8 MHz Ref Osc
BPF
950 MHz
70 MHz IF
Input
uP
RFA Fw d Pw r Level
IPA Level
Synth Level
Temp Sense
Synth Lock
RF Output
944-952 MHz
TX ALC
BPF
70 MHz
BPF
950 MHz
Diplexer
NMS
Synth Data
Synth Enbl
PLL
Loop
Filter
VCO
880 MHz PLL
Synth Lock
Synth Level
Data
Clk
Enbl
Ref
RFA Rev Pw r Level
Synth Clk
Figure 7-4. Transmit Module (Upconverter) Block Diagram
The RF output carrier of the IF Upconverter is fed to the Upconverter via an external (rear
panel) semi-rigid SMA cable. This module performs the necessary conversion to the carrier
frequency. There is an on-board CPU for independent control of the critical RF parameters of
the system.
Since this is a linear RF processing chain, an automatic leveling control loop (ALC) is
implemented here to maintain maximum available power output (and therefore maximum
system gain). The ALC monitors the PA forward power (FWD) output sample, and controls
the Upconverter gain per an algorithm programmed in the CPU. The ALC also controls the
power-up RF conditions of the transmitter output.
Summary of Contents for Starlink SL9003Q
Page 86: ...5 22 Section 5 Module Configuration Moseley SL9003Q 602 12016 01 Revision J ...
Page 90: ...6 4 Section 6 Customer Service Moseley SL9003Q 602 12016 01 Revision J ...
Page 110: ...A 10 Appendix A Path Evaluation Information Moseley SL9003Q 602 12016 01 Revision J ...
Page 118: ...D 2 Appendix D Microvolt dBm Watt Conversion 50 ohms Moseley SL9003Q 602 12016 01 Revision J ...
