Comtech EF Data KST-2000A/B - Manual (Page 21)

Ku- Band Satellite Transceiver Revision 9
Introduction MN/KST2000AB.IOM
1–7
The HPA receives the Ku-Band input from the converter and amplifies it to the
user-selected level.
For KST-2000A/B SSPAs of
≤ 8 Watts, prime power is supplied by the converter via
the M&C cable, while SSPAs
> 8 Watts require a separate power source. The
output power of the SSPA is set by the user via the remote M&C or keypad, and this
output is connected to the feed of the antenna via WR-75 waveguide.
In the receive (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 receive frequency is set by the user
via the remote M&C, or entered using the keypad (on keypad/display equipped
transceivers). The received signal is amplified in an LNA 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) to the LNA.
The converter unit performs a block down conversion (non-inverted sense) first to
L-Band, then to 70 MHz (or 140 MHz if that option was ordered). 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.