Users Manual Part 2

On the front panel, there is a DC power input, three parallel receiver (RX) inputs, a high power
transmitter output signal from the power amplifier, a service port, two interfaces to the Site Controllers,
and LED indicators. For more information on the LED indicators, see Table 98: Base Radio – LED
Indicators on page 352.
The following figures show overall block diagrams of the Base Radios for both architectures: BR-
Arch-1 and BR-Arch-2.
Figure 179: BR-Arch-1 Base Radio – Functional Block Diagram
RJ45
RJ45
CP2 Circuit
Ethernet
Flash
CPLD
RX front end
RX Metering
and control
Synthesizer
PLL
16.8MHz
Osc.
RX Back end
Abacus III
Interface
Interface
Exciter
Metering
and control
TOMAHAWK
Transceiver/Controller Board
PA board
JAVELIN
Baseband
filter
Synthesizer
PLL
Driver
Driver
FPGA
DSP
MSC8101
Host
MPC8250COM
PA
7V+28V
Supply
7V
Conv.
7V 12V28V
28V
7V,28V
7V,12V,28V
SPI
SPI
12V
Conv.
Feedback
Coupler
Circulator
Forward/
reverse
power
meter
Pwr
Detector
Exc.
Out
PA
feed
back
PA
in
PA Metering
and control
Variable
Att.
Variable
Att.
Supply
&Ctrl
Supply
&Ctrl
Exc.
In
RAM
RS232+ trig In/OutRJ45
RF2
RF1
RX I&Q
RX I&Q
RX I&Q
16.8MHz
TX I&Q
SPI
SPI
BUS
Trig In/Out
RF3
DC-
inj.
6802800U74-AP
Chapter 10: Base Radio
348