To: File

From: Jon Hagen

Date: April 10, 2003, 4-16-03 5-03-92

Subject: Alfa backend requirements - summarized by Avinash Deshpande in a conversation following an Alfa meeting today:

Bandwidth	Channels	Input

Levels	Output

Levels	Dump

Time	Misc.
P-Alfa

(pulsar)

300 MHz	1000

(300 kHz res.)	8 bits

min	4 bits max

(flexible)	64 usec	output after long-term mean removed in SW
E-Alfa

(extra-galactic)

200 MHz min	8192

(25 kHz res.)	8 bits min

(12 desired)	16 bits min @ 1 sec dumps	1 sec

(or less for rfi)	flexible blanking

in hardware
G-Alfa HI(galactic)

1415-1425 MHz	1 kHz res. min

=10k channels

(20k desired)	10 desired

(few ok if little rfi)	10 bits	1 sec	blanking not

needed*
G-Alfa

spectral line

One 6MHz band

+ eleven 3MHz bands (all fixed)	0.5kHz

1kHz min

(~40k channels)	8 bits min	10 bits	<1 sec	blanking not

needed*
G-Alfa

continuum

(like P-Alfa

but w/fullstokes

300 MHz	1k	8 bits min	16 bits	.1 sec	blanking not needed*
*rfi excised in software