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The cell amplifier has been designed to support an instantaneous bandwidth of 25 MHz.
Multiple carriers may be placed within a continuous 25 MHz span and the product shall
meet specified performance marks. The PCS amplifier has been designed to support an
instantaneous bandwidth of 45 MHz. Multiple carriers may be placed within a
continuous 45 MHz span in the PCS band and the product shall meet specified
performance marks.
Each amplifier has a nominal gain of 56 dB and is phase matched at room temperatures.
The MCPA is designed to track amplitude and phase over all environmental conditions
such that the units may be used in a parallel configuration
Functional Blocks:
The Andrew MCPA is comprised of the following functional areas:
− Preamplifier with unit gain and phase control
− Feed-Forward amplifier circuit
− Main amplifier stage
− Pre-distortion circuit
− FICA (Filter, Isolator, Combiner Assembly)
− Power conversion circuit
− Controller circuit
− Communications circuit
Inputs and Outputs:
The amplifier is powered from a DC supply voltage, which can range from 21V to 30V.
The DC power is brought into the amplifier through a D-Sub connector located on the
rear side of the amplifier. The D-Sub connector also contains an RS-485
communications bus.
A second D-Sub connector located on the amplifier front panel is used for RS-232
communication. This connector is only used during factory tests and field maintenance
procedures.
Alarms and operating state are communicated to the outside world through the RS-485
communications bus, the RS-232 communications bus, and visible LEDs located on the
amplifier front panel.
The RF signal is brought into the amplifier through a female PkZ type connector located
on the rear of the amplifier. The amplifier RF signal is brought out of the amplifier
through a N type connector located on the rear of the amplifier.
Andrew Corporation – Power Amplifier Group
Propriety – Use pursuant to Company Instruction
RF Power Amplifiers
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