User Manual

Table Of Contents
RF-Orchestra!™ Transmitter Installation and Operation System Description
July 2000 6880493G02-C 2-9
and transmit frequencies. The sample clock (96 kHz), DSP clocks (2.1 MHz), and exciter
reference frequency (4.8 MHz) are all derived from 16.8 MHz. The Exciter has 2 VCOs, which
allow a fast frequency switch.
Figure 2-2: Timing Diagram
16.8 MHz
68360
RF-B!
RF-O!
XiLinx
FPGA
Synthesizer
Synthesizer
Pendulum
Oscillator
Pendulum
Oscillator
XiLinx
FPGA
68360
GPS
RX
UHSO
5 ppb
synthesizer 2 synthesizer 1
VCO 2 VCO 1
4.8 MHz
929-940 MHz
5 kHz
6.25 kHz
steps
Exciter
16.8 MHz
steering voltage
window
reconstructed 1PPS
steering voltage
10 MHz
10 MHz
phase report
1 PPS
Reference
Module
DSP
clocks
Timing Chain provides:
Carrier frequency
Baseband frequencies
Launch time