Comtech EF Data KST-2000L Installation And Operation Manual page 19

Satellite Terminal System
Introduction
The M&C remote control, whose operation is described in Chapter 3, is used to set the
operating parameters of the system such as transmit and receive frequency, gain, etc.; and
to monitor the operation of the system. Connection to the remote M&C is only required
during set up and fault finding.
In the TX (uplink) direction, the converter unit receives a 70 MHz ± 20 MHz signal (140
MHz ± 40 MHz signal optional) at –25 to –45 dBm from a modem via a 50 or 75
coaxial cable. The converter's input connector for this signal is a type N, female.
The converter unit performs a block conversion (non-inverted sense) first to S-Band, then
to Ku-Band. The exact frequency output and power level are set by the user via the
remote M&C. The converter output is coupled to an HPA via a coaxial cable with a 50
female, type N connector at the converter output.
The HPA receives the Ku-Band input from the converter and amplifies it to the
user-selected level. The converter via the M&C cable supplies prime power for the HPA.
The user via the remote M&C sets the output power of the SSPA, and this output is
connected to the feed of the antenna via a WR-75 waveguide.
In the RX (downlink) direction, the received Ku-Band signal from the antenna is offset in
frequency from the transmitted signal allowing rejection of the transmitted signal by the
Transmit Reject Filter (TRF). The exact RX frequency is set by the user via the remote
M&C. The RX signal is down-converted to L-Band and is amplified in an LNB whose
output is coupled to the converter's input via a coaxial cable with type N connectors. This
same cable is used to provide prime power (+15 VDC) and a 10 MHz reference to the
LNB.
An output is provided at L-Band (950 to 1700 MHz) to monitor the received signal. This
is particularly useful during set up and fault finding.
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