48 208495 REV B Operations Manual, HPA2, Compact Outdoor SSPA
4.1 AC / DC Converter
The prime AC input power is delivered to a switching converter module that produces 300
VDC. This module is an auto-sensing, power factor corrected front end that has proven reli-
ability and allows the amplifier system to operate over a wide variety of input power conditions
encountered around the world. A high current, common mode filter is used on the input side
of the converter module that reduces switching components to very minimal levels.
4.2 DC / DC Converter
The DC/DC converter module is also a switched mode power supply that converts the 300
VDC to 12 VDC. This 12 VDC is the primary high current, DC voltage source that operates
the entire amplifier system.
4.3 Solid State Power Amplifier Module
The amplifier module is a unique high density, multifunction module. It not only contains all of
the RF signal amplification and distribution, but also is home to the microcontroller based
monitor and control circuitry. An extremely robust regulation and bias control board supplies
the power to the microwave GaAs FET devices. A separate microcontroller board provides
the M&C functions for the amplifier. Some of the features of this board include:
(2) Serial Ports
(1) Dedicated Flash Firmware Programming
(1) Selectable RS-232 / RS-485 for Host Communication
(1) Ethernet Port
(2) Form C Relays
Summary Alarm, Auxiliary Alarm
(2) Open Collector Outputs
Low RF Fault, Block Up Converter Faults
(4) Closure to Ground Inputs
Mute, Auxiliary Input, Baud Select 0, Baud Select 1
(3) 10 bit Analog Voltage Measurement Channels
RF Output Power Detector
Analog Gain Adjustment
Spare Analog Input
(1) 10 bit D/A for SSPA Gain Adjustment / Temperature Compensation
20 dB gain adjustment with 0.1 dB resolution
(1) Very Accurate Digital Temperature Sensor
0.5 degree resolution within 1°C of SSPA module case temperature
4.3.1 RF Input (J1)
The RF Input signal is applied to J1. The Compact Outdoor SSPA has a default maximum
nominal gain of 75 dB minimum. Therefore the maximum input signal required to saturate the
amplifier can be calculated as:
Input Power = P
sat
- 75 dB
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