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38 205486 REV F Operations Manual, HPA2, Compact Outdoor SSPA
4.1 EMI Filter and Transient Protection
The EMI (Electro-magnetic Interference) Filter is a passive electronic device used to suppress
conducted interference present on any power or signal line. It may be used to suppress the
interference generated by the device itself as well as to suppress the interference generated
by other equipment to improve the immunity of a device to the EMI signals present within its
electromagnetic environment. The filter was designed with an added Metal Oxide Variable
resistor (MOV) to provide transient voltage and surge protection.
4.2 Power Supply
The Power Supply consists of one or two AC/DC Converters and a DC/DC Converter.
4.2.1 AC / DC Converter
The prime AC input power is delivered to a switching converter module that produces 300
VDC. Depending on the input power requirement of the amplifier, there may be one or two
AC/DC Converters present in the unit. These modules are auto-sensing, power factor
corrected front ends that have proven reliability and allow 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.
4.2.2 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:
(3) Serial Ports
(1) Dedicated Flash Firmware Programming
(1) Ethernet Port for Host Communication
(1) Selectable RS232 / RS485 for Host Communication
(2) Form C Relays
Summary Alarm, Auxiliary Alarm
(5) Open Collector Outputs
Summary, Auxiliary, Voltage, Current, Temperature, Block Up Converter Faults
(2) Closure to Ground Inputs
Mute, Auxiliary Input
(8) 10 bit Analog Voltage Measurement Channels