Specifications

5/9/13 888-2857-001 4-5
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
Platinum VAX-C Series
Figure 4-2 VAX-C Modulator - Signal Flow Block Diagram
Up Converter
Multiple
Input
Down Converter
RF
Switch
Down Converter
1st
L.O.
2nd
L.O.
10 MHz
Reference
PA RTAC
RTAC POST HPF
Up Converter
RF Output
DAC
ADC
Digital
Precorrector
FPGA
Transport
ASI HP 1
54 MHz
Clock
Part of FPGA
Analog
Loopback
Local Osc
Distribution
Local Osc
DAC
Clock
Frequency
Up Down Converter Board
Precise Frequency
Reference Board
Control
GPS
Receiver
ASI LP 1
SMPTE HP 2
SMPTE LP 2
Stream
Switch
Modulator
Modulator
1PPS
10 MHz Tune 1 PPS Int 10 MHz Control
Signal Processor Board
GPS
Antenna
Divide
By 4
140 MHz IF Signal
To PA
Power
Amplifier
Power
Amplifier
Interface
DC Input
And
Control
AC/DC
Converter
DC
PA
Status
And
Control
Sample Input
Sample Input
PA
To
and Control Board
Front
Panel RF
Sample
RF Output
To HPF