Technical Manual

ATLAS 4500 Multimode Station Technical Manual December 2016 A-9
380-520 MHz Power Amplifier Appendix A - UHF Circuit Descriptions
IC48 regulates +5 V supply down to +3.3 VDC.
A.3 380-520 MHz Power Amplifier
This section contains information on the following Power Amplifier components:
• Attenuator
• Driver Module
• Output Power Amp
•Power Coupler
• Power Detector
• Harmonic Filter
• PTT Power Control
• Auxiliary Circuits
A.3.1 General Description
The PA contains the following components
• Variable attenuator
• Driver module
• Main power amp
• Cooling system and heat sensor
• Coupler for DPD system.
• Power detector
• Low pass filter
• PTT switch
• Serial flash memory and regulator
A.3.2 Schematic Description
A.3.2.1 General
The RF input is approximately 12 dBm into CN1. The PA provides 1-100 W output
across 380 – 520 MHz band at the main N type connector. The Main supply is 48V
at < 10A at CN3. The secondary supply is 24 V at 450 ma at CN2, and 5 V at 10 ma
at CN2.