Last modified: Tuesday, 18-May-2004 08:21:35 EDT

GBT Spectrometer Spigot Mode Chart
A list of the personalities, etc. for each mode can be found here
Postscript and pdf versions of this table are available

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Only modes outlined in blue are currently tested and recommended for use!
Modes in green are on hold due to needed changes in the firmware. No current plans are in place to release these modes
Modes in red failed engineering tests and will not be released
MODE TESTED # Freq. Channels # BITS # SAMPLERS # QUADRANTS POLARIZATION POLARIZATION
SUMMED 		BANDWIDTH
(MHZ) 		SAMPLE TIME
(usec)
1 and 2 Yes/Yes 1024 16 1 or 2 1 or 2 1 or 2A NO/Yes 800 81.92
3 and 4 Yes/Yes 1024 8 1 or 2 1 or 2 1 or 2A NO/Yes 800 40.96
5 and 6 Yes/Yes 1024 4 1 or 2 1 or 2 1 or 2A NO/Yes 800 20.48
7 NO 1024 4 2 1 4 NO 800 81.92
9 NO 1024 2 1 2 1 NO 800 10.24
A NO 1024 2 2 2 1 / 2 NO 800 20.48
B NO 1024 2 2 2 4 NO 800 40.96











13 and 14 No/No 2048 8 1 or 2 1 or 2 1 or 2A NO/Yes 800 81.92
15 and 16 Yes/Yes 2048 4 1 or 2 1 or 2 1 or 2A NO/Yes 800 40.96
19 NO 2048 2 1 2 1 NO 800 20.48
1A NO 2048 2 2 2 1 / 2 NO 800 40.96
1B NO 2048 2 2 2 4 NO 800 81.92
1C NO 2048 2 4 2 1 / 2 NO 800 81.92











21 and 22 NO 512 16 1 or 2 1 or 2 1 or 2A NO/Yes 800 40.96
23 and 24 NO 512 8 1 or 2 1 or 2 1 or 2A NO/Yes 800 20.48
25 and 26 NO 512 4 1 or 2 1 or 2 1 or 2A NO/Yes 800 10.24
27 NO 512 4 2 1 4 NO 800 40.96
29 NO 512 2 1 2 1 NO 800 5.12
2A NO 512 2 2 2 1 / 2 NO 800 10.24
2B NO 512 2 2 2 4 NO 800 20.48











31 and 32 NO 256 16 1 or 2 1 or 2 1 or 2A NO/Yes 800 20.48
33 and 34 NO 256 8 1 or 2 1 or 2 1 or 2A NO/Yes 800 10.24
35 and 36 NO 256 4 1 or 2 1 or 2 1 or 2A NO/Yes 800 5.12
37 NO 256 4 2 1 4 NO 800 20.48
39 NO 256 2 1 2 1 / 2 NO 800 2.56
3A NO 256 2 2 2 1 / 2 NO 800 5.12
3B NO 256 2 2 2 4 NO 800 10.24











1_2X and 2_2X Yes/Yes 512 16 1 or 2 1 or 2 1 or 2A NO/Yes 200 81.92
3_2X and 4_2X Yes/Yes 512 8 1 or 2 1 or 2 1 or 2A NO/Yes 200 40.96
5_2X and 6_2X Yes/Yes 512 4 1 or 2 1 or 2 1 or 2A NO/Yes 200 20.48
7_2X NO 512 4 2 1 4 NO 200 81.92
9_2X NO 512 2 1 2 1 NO 200 10.24
A_2X NO 512 2 2 2 1 / 2 NO 200 20.48
B_2X NO 512 2 2 2 4 NO 200 40.96









200
13_2X and 14_2X No/No 1024 8 1 or 2 1 or 2 1 or 2A NO/Yes 200 81.92
15_2X and 16_2X Yes/Yes 1024 4 1 or 2 1 or 2 1 or 2A NO/Yes 200 40.96
19_2X NO 1024 2 1 2 1 NO 200 20.48
1A_2X NO 1024 2 2 2 1 / 2 NO 200 40.96
1B_2X NO 1024 2 2 2 4 NO 200 81.92
1C_2X NO 1024 2 4 2 1 / 2 NO 200 81.92










21_2X and 22_2X NO 256 16 1 or 2 1 or 2 1 or 2A NO/Yes 200 40.96
23_2X and 24_2X NO 256 8 1 or 2 1 or 2 1 or 2A NO/Yes 200 20.48
25_2X and 26_2X NO 256 4 1 or 2 1 or 2 1 or 2A NO/Yes 200 10.24
27_2X NO 256 4 2 1 4 NO 200 40.96
29_2X NO 256 2 1 2 1 NO 200 5.12
2A_2X NO 256 2 2 2 1 / 2 NO 200 10.24
2B_2X NO 256 2 2 2 4 NO 200 20.48











31_2X and 32_2X NO
 128 16 1 or 2 1 or 2 1 or 2A NO/Yes 200 20.48
33_2X and 34_2X NO
 128 8 1 or 2 1 or 2 1 or 2A NO/Yes 200 10.24
35_2X and 36_2X NO 128 4 1 or 2 1 or 2 1 or 2A NO/Yes 200 5.12
37_2X NO 128 4 2 1 4 NO 200 20.48
39_2X NO 128 2 1 2 1 / 2 NO 200 2.56
3A_2X NO 128 2 2 2 1 / 2 NO 200 5.12
3B_2X NO 128 2 2 2 4 NO 200 10.24






















41 and 42 Yes/Yes 1024 16 1 or 2 1 or 2 1 or 2A NO/Yes 50 81.92
43 and 44 Yes/Yes 1024 8 1 or 2 1 or 2 1 or 2A NO/Yes 50 40.96
45 and 46 Yes/Yes 1024 4 1 or 2 1 or 2 1 or 2A NO/Yes 50 20.48
47 NO 1024 4 2 1 4 NO 50 81.92
49 NO 1024 2 1 2 1 / 2 NO 50 10.24
4A NO 1024 2 2 2 1 / 2 NO 50 20.48
4B NO 1024 2 2 2 4 NO 50 40.96











53 and 54 No/No 2048 8 1 or 2 1 or 2 1 or 2A NO/Yes 50 81.92
55 and 56 Yes/Yes 2048 4 1 or 2 1 or 2 1 or 2A NO/Yes 50 40.96
59 NO 2048 2 1 2 1 / 2 NO 50 20.48
5A NO 2048 2 2 2 1 / 2 NO 50 40.96
5B NO 2048 2 2 2 4 NO 50 81.92
5C NO 2048 2 4 2 1 / 2 NO 50 81.92











61 and 62 NO 512 16 1 or 2 1 or 2 1 or 2A NO/Yes 50 40.96
63 and 64 NO 512 8 1 or 2 1 or 2 1 or 2A NO/Yes 50 20.48
65 and 66 NO 512 4 1 or 2 1 or 2 1 or 2A NO/Yes 50 10.24
69 NO 512 2 1 2 1 / 2 NO 50 5.12
6A NO 512 2 2 2 1 / 2 NO 50 10.24
6B NO 512 2 2 2 4 NO 50 20.48











71 and 72 NO 256 16 1 or 2 1 or 2 1 or 2A NO/Yes 50 20.48
73 and 74 NO 256 8 1 or 2 1 or 2 1 or 2A NO/Yes 50 10.24
75 and 76 NO 256 4 1 or 2 1 or 2 1 or 2A NO/Yes 50 5.12
77 NO 256 4 2 1 4 NO 50 20.48
79 NO 256 2 1 2 1 / 2 NO 50 2.56
7A NO 256 2 2 2 1 / 2 NO 50 5.12
7B NO 256 2 2 2 4 NO 50 10.24











41_2X and 42_2X YES/YES 512 16 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 81.92
43_2X and 44_2X YES/YES 512 8 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 40.96
45_2X and 46_2X NO/NO 512 4 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 20.48
47_2X NO 512 4 2 1 4 NO 12.5 81.92
49_2X NO 512 2 1 2 1 / 2 NO 12.5 10.24
4A_2X NO 512 2 2 2 1 / 2 NO 12.5 20.48
4B_2X NO 512 2 2 2 4 NO 12.5 40.96











53_2X and 54_2X No/No 1024 8 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 81.92
55_2X and 56_2X Yes/Yes 1024 4 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 40.96
59_2X NO 1024 2 1 2 1 / 2 NO 12.5 20.48
5A_2X NO 1024 2 2 2 1 / 2 NO 12.5 40.96
5B_2X NO 1024 2 2 2 4 NO 12.5 81.92
5C_2X NO 1024 2 4 2 1 / 2 NO 12.5 81.92











61_2X and 62_2X NO 256 16 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 40.96
65_2X and 66_2X NO 256 8 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 20.48
65_2X and 66_2X NO 256 4 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 10.24
69_2X NO 256 2 1 2 1 / 2 NO 12.5 5.12
6A_2X NO 256 2 2 2 1 / 2 NO 12.5 10.24
6B_2X NO 256 2 2 2 4 NO 12.5 20.48











71_2X and 72_2X NO 128 16 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 20.48
73_2X and 74_2X NO 128 8 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 10.24
75_2X and 76_2X NO 128 4 1 or 2 1 or 2 1 or 2A NO/Yes 12.5 5.12
77_2X NO 128 4 2 1 4 NO 12.5 10.24
79_2X NO 128 2 1 2 1 / 2 NO 12.5 2.56
7A_2X NO 128 2 2 2 1 / 2 NO 12.5 5.12
7B_2X NO 128 2 2 2 4 NO 12.5 10.24











81 and 82 No/No 1024 16 1 or 2 1 or 2 1 or 2A NO/Yes 200 81.92
83 and 84 No/No 1024 8 1 or 2 1 or 2 1 or 2A NO/Yes 200 40.96
85 and 86 No/No 1024 4 1 or 2 1 or 2 1 or 2A NO/Yes 200 20.48
87 NO 1024 4 2 1 4 NO 200 81.92
89 NO 1024 2 1 2 1 NO 200 10.24
8A NO 1024 2 2 2 1 / 2 NO 200 20.48
8B NO 1024 2 2 2 4 NO 200 40.96









200
93 and 94 No/No 2048 8 1 or 2 1 or 2 1 or 2A NO/Yes 200 81.92
95 and 96 No/No 2048 4 1 or 2 1 or 2 1 or 2A NO/Yes 200 40.96
99 NO 2048 2 1 2 1 NO 200 20.48
9A NO 2048 2 2 2 1 / 2 NO 200 40.96
9B NO 2048 2 2 2 4 NO 200 81.92










A1 and A2 NO 512 16 1 or 2 1 or 2 1 or 2A NO/Yes 200 40.96
A3 and A4 NO 512 8 1 or 2 1 or 2 1 or 2A NO/Yes 200 20.48
A5 and A6 NO 512 4 1 or 2 1 or 2 1 or 2A NO/Yes 200 10.24
A7 NO 512 4 2 1 4 NO 200 40.96
A9 NO 512 2 1 2 1 NO 200 5.12
AA NO 512 2 2 2 1 / 2 NO 200 10.24
AB NO 512 2 2 2 4 NO 200 20.48











B1 and B2 NO
 256 16 1 or 2 1 or 2 1 or 2A NO/Yes 200 20.48
B3 and B4 NO
 256 8 1 or 2 1 or 2 1 or 2A NO/Yes 200 10.24
B5 and B6 NO 256 4 1 or 2 1 or 2 1 or 2A NO/Yes 200 5.12
B7 NO 256 4 2 1 4 NO 200 20.48
B9 NO 256 2 1 2 1 / 2 NO 200 2.56
BA NO 256 2 2 2 1 / 2 NO 200 5.12
BB NO 256 2 2 2 4 NO 200 10.24


Notes:

1. Where two modes appear on the same line, like MODE 1 and 2, the two modes are identical except that the first uses only a single quadrant and the second uses two quadrants with the two quadrant results added together

2. TESTED indicates whether the mode has been tested and verified by taking data (either from a pulsar or from a pulsed noise source)

3. POLARIZATION options are:

4. 200 & 12.5 MHZ modes: For now, the 200 and 12.5 Mhz modes are simply the 800 and 50 MHZ modes (respectively) with half the frequency channels. Eventually this will change to have 'true' 200 and 12.5 Mhz modes.