Service Manual

321
6802800U74-AN
Chapter 10: Base Radio
Figure 178: BR-Arch-1 Base Radio – Functional Block Diagram
RJ45
RJ45
CP2 Circuit
CPLD
Flash
RAM
BUS
Ethernet
RJ45
RS232+ trig In/Out
Host
MPC8250COM
RF1
DC-
inj.
RX front end
RX I&Q
RX I&Q
RX I&Q
Trig In/Out
RF2
RX Back end
Abacus III
Interface
RF3
SPI
FPGA
DSP
MSC8101
RX Metering
and control
Synthesizer
PLL
16.8MHz
16.8MHz
Osc.
SPI
TX I&Q
Interface
Exciter
Metering
and control
SPI
Synthesizer
PLL
7V,12V,28V
Supply
&Ctrl
TOMAHAWK
Baseband
filter
JAVELIN
Driver
Pwr
Detector
Exc.
Out
Transceiver/Controller Board
Exc.
In
PA board
Forward/
reverse
power
meter
Variable
Att.
PA
feed
back
Circulator
Feedback
Coupler
PA
Driver
7V
Conv.
PA Metering
and control
Variable
Att.
PA
in
7V 28V 12V
28V
12V
Conv.
SPI
7V+28V
Supply
7V,28V
Supply
&Ctrl