Users Manual Part 2

Power Amplifier in BR-Arch-2 Base Radios
Power Amplifiers in BR-Arch-2 are available in a single, high-power version capable of running
efficiently in low-power setting. This version comes in different frequency bands. The following table
contains a list of all available PAs in BR-Arch-2 Base Radios.
Table 97: Power Amplifiers in BR-Arch-2 Architecture
MTS Band Power Configuration Frequency Bands
400 MHz high-low power 320 – 400 MHz
380 – 470 MHz
Figure 183: Mid-power PA Functional Block Diagram
Blackbear2
Blackbear2
LDM
Feedback
Coupler
Combiner
Circulator
Forward/
Reverse
Coupler
PA
OUTPUT
Fixed
Attenuator
Adjustable
Atten
Attenuator
Splitter
FB
OUTPUT
Adjustable
Atten
PA
INPUT
10.3
Base Radio – Indicators and Connectors
Table 98: Base Radio – LED Indicators
#
LED/Port
name
Type Controlled by Indication
LED
1
Tx Red/
Green
SW BR keying:
• OFF: BR is not keyed
• AMBER: BR is keyed without
service
• GREEN: BR is keyed
LED
2
Aux Red/
Green
SW
•
OFF: No alarms
• AMBER: not used
• RED: not used
LED
3
Status Red/
Green
SW Red LED
will turn on be-
fore SW
change any in-
dication
BR status:
• OFF: Status unknown, power
off
• GREEN: BRC main applica-
tion is running
6802800U74-AP
Chapter 10: Base Radio
352