PRELIMINARY
Radio Description
• Channel filtering
• Delay and gain adjustment
• Digital predistortion
• RF modulation and demodulation
• Optical cable interface termination
•
Two receivers for RX diversity
• RET modem (the antenna system communication link)
4.1.2 PA
The Multi Carrier Power Amplifier (MCPA) is the linear power amplifier for the
RF carriers. The radio has
two MCPAs, one for each branch.
4.1.3 FU
The Filter Unit (FU) consists of
low-noise amplifiers (only Radio 2217) and
band-pass filters.
In the radio, the FU also provides the following:
• Power and supervision for the TMA, or the RIU
• Voltage Standing Wave Ratio (VSWR) supervision
4.1.4 DC SPD
The DC SPD board protects the DC power input from lightning currents.
4.1.5 ALD (RET) SPD
An SPD provides overvoltage or overcurrent protection for the ALD (RET) port.
4.1.6 External Alarm SPD
An SPD provides overvoltage or overcurrent protection for the external alarm
ports.
4.2 Fan Unit (Optional)
The Radio 2217 fan is DC-powered (24 V DC) and controlled via the radio
external alarm port.
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181/1551-LZA 701 6001-1-V1 Uen PC3 | 2016-01-13
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