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Operational Settings
The following settings were programmed into the ComBlock circuit boards, allowing ICSat to function properly. For further information on the programming of the circuit boards see the ComBlock Register Values.
A. COM-3303-A Receiver:
RF Synthesizer Frequency - 1.767 GHz
Internal Frequency Reference - Internal
Step Size Selection - 25 kHz
Enable PLL_STROBE Control on J6 Connector - Disabled
Number of RF Frequencies in Scanning List - 1
B. COM-1001 Demodulator:
Nominal Symbol Rate - 209715
Nominal Carrier Frequency - No Carrier Frequency Employed
Input Sample Format
Freeze Monitoring Data - Re-enable Update
Differential Decoding - Off
Spectrum Inversion - Off
Enable Extended Frequency Acquisition - Enabled
htmlCarrier Frequency Tracking Loop Gain - 1
Input Format - Unsigned
Output Sample Format
Force Re-acquisition - Enabled
Force Sampling Rate - Sampling Clock Based on External Sampling Signal SAMPLE_CLK_IN
Modulation - Binary Phase Shift Keying
AFC Enable - Disabled
Output Sample Format - Inverse Q Parallel
C. COM-5101 RS422 Interface:
No Applicable Settings
D. COM-1002 Modulator:
Symbol Rate - 419430.4
Offset Carrier Frequency - No Carrier Frequency Employed
Signal Gain - 50
Internal/External Clock Selection
Interpolation to Maximum Clock Rate - Off
Spectrum Inversion - Off
Test Mode - Internal Generation of Periodic Bit Sequence as Modulator Input
Modulation - Binary Phase Shift Keying
Output Format - Unsigned
Clock Selection - Internal
Differential Encoding - Disabled
E. COM-2001 Digital to Analog Converter
No Applicable Settings
F. COM-4001-A RF Modulator
Low-Band RF Synthesizer Frequency - 0.915 GHz
Upper-Band RF Synthesizer Frequency - 2.2022 GHz
Transmit Power Control, Least Significant Bit - 0
Transmit Power Control, Most Significant Bit - 0
Upper/Lower Frequency Selection
Modulator - On
Frequency Selection - Upper
Frequency Reference - Internal