General Dynamics CG-1220, Operation And Maintenance Manual

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Appendix C– DTR Remote M&C Protocol CG-6073 (Rev R, June, 2012)
23
FIFO-TEST
Path:
/ TESTS FIFO-TEST
Type:
Executable
Syntax:
FIFO-TEST
Notes:
This diagnostic displays a test pattern received from the SPU, in hexadecimal
values. The pattern should be like below. In case of failure, a small “x” will
precede those values that do no match.
R/C A B C D E
1 0000 0001 1111 0002 2222
2 4444 0010 5555 0020 6666
3 8888 0100 9999 0200 AAAA
4 CCCC 1000 DDDD 2000 EEEE
FIFO TEST: PASSED
FILTER
Path:
/ CONFIGS OPERATION FILTER
Type:
Data Editor
Syntax:
FILTER [= n] | [D]
Range:
Integer: 0 .. 5 (0 .. 11 in Wideband units )
Standard Wideband IF MONITOR center
0 16 kHz 0 16 kHz 70 MHz
1 62.5 kHz 1 32 kHz 70 MHz
2 125 kHz 2 62.5 kHz 70 MHz
3 250 kHz 3 125 kHz 70 MHz
4 32 kHz 4 250 kHz 70 MHz
5 500 kHz 5 500 kHz 70 MHz
6 1 MHz 70 MHz
7 2 MHz 72 MHz
8 4 MHz 72 MHz
9 8 MHz 72 MHz
10 12 MHz 72 MHz
11 16 MHz 71 MHz (see notes)
Notes:
FILTER controls the bandwidth of the bandpass filter, centered around the receiver
tuning frequency. 500 kHz is the default, for tracking most signals; selecting a
narrower filter may optimize the carrier-to-noise ratio (C/NO?). A signal is detectable
if it is visible on the SPECTRAL DISPLAY. A spectrum analyzer attached to the IF
MONITOR port may be used to view the filter band. The 16 MHz filter coverage is
9 MHz below to 7 MHz above with a 1.5 MHz notch 7 MHz below the tuning
frequency; NCO OFFSET should be zero when this filter is used.
500 kHz is the default bandwidth filter. This allows the ability to track most CW
beacon carriers. Selecting a smaller bandwidth filter will improve the carrier-to-noise
ratio (C/No). However, the bandwidth filter selected must be greater than the
Doppler Effect in order to track the carrier continuously.