Comtech EF Data KST-12000 - Manual (Page 20)

KST-12000 Ku-Band Satellite Terminal Revision 4
Introduction MN/KST12000.IOM
1.1.3 Low Noise Amplifier (LNA)
The feed assembly consists of an LNA and a wave guide Transmit Reject Filter (TRF).
The TRF provides receive system protection from transmit energy fed back through the
antenna feed system.
The LNA standard noise temperature is 120
°K, with optional upgrades down to 80°K,
depending upon Gain over Temperature (G/T) requirements.
1.1.4 Outdoor Enclosure
The RFT-1200 is a weatherproof enclosure housing the following:
• Solid-State Power Amplifier (SSPA)
• Up and down converters
• M&C microprocessor
• Power supply and cables which interface with an antenna subsystem
In the transmit (uplink) direction, the RFT-1200 accepts a 70 MHz IF signal, and
transmits it in the 14.0 to 14.5 GHz frequency band.
In the receive (downlink) direction, depending upon the frequency band options, the
terminal accepts an RF signal in either the full 10.95 to 12.75 GHz band, or within an
individual sub-band (10.95 to 11.7 GHz, 11.7 to 12.2 GHz, 12.25 to 12.75 GHz), and
converts the signal to 70 MHz IF output.
Power levels range from +8 dBm (for driving an external TWT) to 16W, depending upon
Equivalent Isotropically Radiated Power (EIRP) requirements. The SSPAs are
temperature compensated for maximum stability.
The up and down converters are dual conversion with individual synthesizers for
independent transmit and receive transponder selection.
The microprocessor provides:
• Online loop monitoring
• Dynamic control functions
• Configuration
control
• Fault/status monitoring
• Serial computer/terminal interface
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