GBT Spectrometer Checkouts

Spectrometer Astronomical Checkouts

This page summarizes the status of the various modes of the GBT Auto-Correlation Spectrometer (ACS).
The tables list the top priority, i.e., the most-requested modes. Click in the 'Mode String' column for a detailed report on the observing tests.
One may also see a list of problems that have been identified in the process of doing the checkouts.

Study of Effects of Power Levels (using 50MHz, 9-level mode, L-band).

Checkout status is "(ok)" in parentheses if there are no obvious spectrometer problems, but there are problems with baselines or RFI.

12.5 MHz ACS modes
Samps	Quads	Band	Channels	Spacing (kHz)	Bank/Mode String (Click For Report)	Hardware Checkout	Observing Checkout
2	1	12-9Lev	8192	1.5	1N2-0A-12-9	ok	ok
4	2	12-9Lev	8192	1.5	A: 1N2-0A-12-9 B: 1N2-1B-12-9	ok	ok
8	4	12-9Lev	8192	1.5	A: 1N2-0A-12-9 B: 1N2-1B-12-9 C: 1N2-2C-12-9 D: 1N2-3D-12-9	ok	needs work
4	1	12-9Lev	4096	3.0	1N4-0A-12-9	ok	ok
8	2	12-9Lev	4096	3.0	A: 1N4-0A-12-9 B: 1N4-1B-12-9	ok	ok
16	4	12-9Lev	4096	3.0	A: 1N4-0A-12-9 B: 1N4-1B-12-9 C: 1N4-2C-12-9 D: 1N4-3D-12-9	ok	in progess
8	1	12-9Lev	2048	6.1	1N8-0A-12-9	ok	ok
8	1	12-3Lev	8192	1.5	1N8-0A-12-3	ok	ok
4	2	12-9Lev	8192	1.5	2N4-4A-12-9	ok? small ACF steps	ok
4	2	12-3Lev	32768	0.38	2N4-4A-12-3	ok?	ok
8	4	12-9Lev	8192	1.5	A: 2N4-4A-12-9 B: 2N4-5B-12-9	multi-bank: to be tested	ok
2	4	12-9Lev	32768	0.381	4N2-6A-12-9	ok	ok
2	4	12-3Lev	131072	0.095	4N2-6A-12-3	ok	needs work

50 MHz ACS Modes:

Samps Quads Band Channels Spacing
(kHz) Bank/Mode String
(Click For Report) Hardware Checkout Observing Checkout

2 1 50-9Lev 8192 6.1 1N2-0A-50-9 ok ok

4 2 50-9Lev 8192 6.1 A: 1N2-0A-50-9
B: 1N2-1B-50-9 ok ok

8 4 50-9Lev 8192 6.1 A: 1N2-0A-50-9
B: 1N2-1B-50-9
C: 1N2-2C-50-9
D: 1N2-3D-50-9 ok ok

4 1 50-9Lev 4096 12 1N4-0A-50-9 ok (ok)

8 2 50-9Lev 4096 12 A: 1N4-0A-50-9
B: 1N4-1B-50-9 (ok)

16 4 50-9Lev 4096 12 A: 1N4-0A-50-9
B: 1N4-1B-50-9
C: 1N4-2C-50-9
D: 1N4-3D-50-9
in progress

8 1 50-9Lev 2048 24 1N8-0A-50-9 ok (ok)

8 1 50-3Lev 8192 6.1 1N8-0A-50-3 ok ok

2 4 50-9Lev 32768 1.526 4N2-6A-50-9 ok ok

2 4 50-3Lev 131072 0.381 4N2-6A-50-3 ok needs work

200 MHz ACS Modes:

Samps Quads Band Channels Spacing
(kHz) Bank/Mode String
(Click For Report) Hardware Checkout Observing Checkout

2 1 200 8192 24 1W2-0XY-200 ok ok?

4 2 200 8192 24 A: 1W2-0XY-200
B: 1W2-1XY-200 ok? (ok)

8 4 200 8192 24 A: 1W2-0XY-200
B: 1W2-1XY-200
C: 1W2-2XY-200
D: 1W2-3XY-200 ok

4 1 200 4096 48 1W4-0WXYZ-200 ok? (ok)

2 4 200 32768 6.1 4W2-6XY-200 ok (ok)

2 2 200 16384 12 2W2-4XY-200 ok (ok)

4 4 200 16384 12 A: 2W2-4XY-200
B: 2W2-5XY-200 ok (ok)

800 MHz ACS Modes:

Samps Quads Band Channels Spacing
(kHz) Bank/Mode String
(Click For Report) Hardware Checkout Observing Checkout

2 1 800 2048 391 1W2-0XY-800 in progress in progress

4 2 800 2048 391 A: 1W2-0XY-800
B: 1W2-1XY-800 in progress in progress

8 4 800 2048 391 A: 1W2-0XY-800
B: 1W2-1XY-800
C: 1W2-2XY-800
D: 1W2-3XY-800 in progress (ok)

1 2 800 8192 98 2W1-4X-800 ok (ok)

2 4 800 8192 98 A: 2W1-4X-800
B: 2W1-5X-800 ok needs work

4 4 800 4096 195 A: 1W1-0X-800
B: 1W1-1X-800
C: 1W1-2X-800
D: 1W1-3X-800 ok needs work