Comtech EF Data KST-12000 - Manual (Page 88)

KST-12000 Ku-Band Satellite Terminal Revision 4
Theory of Operation MN/KST12000.IOM
5.1.2.1 Remote Interface Specification
Refer to Appendix A.
5.1.3 Terminal Default Conditions
On initial power-up, the unit will default to the following parameters.
Parameter Default
Baud Rate [9600]
Parity [Even]
Device Address
[1]
U/C Gain [10.0]
D/C Gain [0.0]
RF Output [OFF]
U/C Frequency [Low end of range]
D/C Frequency [Low end of range]
5.1.4 Theory of Operation
Refer to Figure 5-3 for a functional block diagram of the M&C.
The M&C PCB performs the following operations:
• Receives the desired frequency from either the remote RS-232/485 or local
keypad, and after converting it to a synthesizer setting, stores it to the applicable
synthesizer output latch.
• Reads the thermistors located in the up converter, down converter, and
high-power
amplifier , and converts them to temperatures for display.
• Reads the characterization EEPROMs in the up converter, down converter, and
high-power amplifier , and calculates an Automatic Gain Control (AGC) voltage
based on frequency and temperature to linearize the respective module.
• Turns the fan OFF or ON, depending on the temperature.
• Receives fault inputs from all modules, and presents them to the remote RS-
232/485 and the optional local keypad display.
• Performs an initial current sense on the LNA, and stores the reading in
EEPROM. Subsequent current sense readings are taken and compared to the
initial reading to determine a fault.
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