Service Manual

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6802800U74-AN
Chapter 10: Base Radio
Power Amplifiers in BR-Arch-1 Base Radios
Power Amplifiers in BR-Arch-1 are available in both high and low power versions. High-power PAs in
400 MHz band are available on two different frequency bands. The following table contains a list of all
available PAs in BR-Arch-1 Base Radios.
Table 97: Power Amplifiers in BR-Arch-1 Architecture
MTS Band
Power Configuration
Frequency Bands
260 MHz
low-power
260 MHz – 275 MHz
400 MHz
high-power
350 MHz – 379 MHz
380 MHz – 470 MHz
low-power
380 MHz – 470 MHz
800 MHz
low-power
806 MHz – 870 MHz
900 MHz
low-power
932 MHz – 942 MHz
Figure 180: Low-power PA Functional Block Diagram
Figure 181: High-power PA Functional Block Diagram
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 98: Power Amplifiers in BR-Arch-2 Architecture
MTS Band
Power Configuration
Frequency Bands
400 MHz
high-low power
320 – 400 MHz
380 – 470 MHz
PA
LFM
PA OUT
PA IN
Forward VVA
Attenuator
Splitter
Feedback
Coupler
Circulator
Forward/
Reverse
Coupler
LDM
Combiner
PA Feedback
OUT
LFM
Attenuator Reverse VVA
PA
LFM
PA OUT
PA IN
Forward VVA
Attenuator
Splitter
Feedback
Coupler
Circulator
Forward/
Reverse
Coupler
LDM
LFM
Combiner
PA Feedback
OUT
LFM
Attenuator Reverse VVA