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JCMT Newsletter No. 22 (ACSIS Configs)

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"Day 1" ACSIS Configurations


At the time of this writing (early March 2004) ACSIS is still scheduled to arrive in May 2004 to be commissioned by July. However, there are indications that its delivery may be delayed until the Fall.

When ACSIS is fully commissioned, the expected "Day 1" configurations available are listed below. "Hybrid" mode is ACSIS-speak for use of more than one subband. The hybrid modes have some significant subband overlap (20% or so), resulting in a lower overall bandwidth than quoted. The bandwidths given are independent of whether there are 1 or 2 mixer inputs. Although there is no 125-MHz bandwidth, the number of available channels more than compensates for that in terms of spectral resolution using the 250-MHz bandwidth.

Bandwidth # Channels Resolution Hybrid?
250 MHz 8k 30.5 kHz N
500 MHz 16k 30.5 kHz Y
1000 MHz 2k 488 kHz N
2000 MHz 4k 488 kHz Y
1000 MHz 32k 30.5 kHz Y


Gerald Schieven


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Contact: Antonio Chrysostomou. Updated: Tue Aug 17 17:32:12 HST 2004

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