Comtech EF Data HPCST-5000 - Manual (Page 25)

High Power C-Band Satellite Terminal Introduction
Rev. 0 1–9
1.5 Component Descriptions
1.5.1 Radio Frequency Transceiver (RFT)
The RFT-500 assembly is a weatherproof enclosure housing the following:
"
Up and down converters
" Frequency synthesizer
"
M&C system
"
Power supply and cables, which interface with an antenna subsystem
In the TX (uplink) direction, the terminal accepts a 70 (140) MHZ IF signal and transmits
it in the 5.845 to 6.425 GHz frequency band. This output is coupled through an N-type
connector to the external high power amplifier (SSPA) assembly. The redundant system
provides the high power output to the antenna through a waveguide transfer switch. A
high-power termination is included on the offline channel port of the waveguide switch
for testing.
In the RX (downlink) direction, the terminal accepts an RF signal in the 3.6 to 4.2 GHz
band, and converts the signal to a 70 (140) MHz IF output. The LNA assembly has a
type-N coax output routed to RFT RX RF inputs.
The RFT TX output power level at 1 dB compression used to drive the external SSPA is
+8 dBm maximum. The up and down converters are dual conversion, configured with a
single or dual synthesizer for TX and RX transponder selection.
The microprocessor provides:
" On-line loop monitoring
" Dynamic control functions
" Configuration control
" Fault/status monitoring
" Serial computer/terminal interface