To: File
From: Jon Hagen
Date: April 10, 2003, 4-16-03 5-03-03
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 | (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