[evlatests] 3-bit status
Keith Morris
kmorris at nrao.edu
Thu Oct 6 15:32:40 EDT 2011
> ea12 is still using old T304s -- we expect no fringes for A2C2, and
> possibly low amp on A1C1
We expect weak/noisy fringes (low total power) for ea12 A2C2. We expect
normal amplitudes on ea12 A1C1.
Michael Rupen wrote:
> There were a number of tweaks to the 3-bit system yesterday. This is
> my understanding of what I've heard -- please send along any corrections!
>
>
> * New samplers in ea10, ea12; all old samplers removed from array
>
> We currently have all the first article sampler boards out on
> the array, with 4 samplers (2 modules) each in:
>
> ea06 ea07 ea10 ea12 ea14 ea26
>
> ea06, ea07, ea10, ea14, and ea26 have new T304s
> ea12 is still using old T304s -- we expect no fringes for A2C2, and
> possibly low amp on A1C1
>
> The old samplers will be returned to the array once Mike is done with
> them (primarily putting in the new firmware), probably next week.
> T304s for these will appear a few weeks thereafter.
>
> Note that the sampler that was in ea15-A1 looked quite dead when on the
> array.
>
>
> * The monitor point on the d301/d303 reports the following
> serial numbers for the samplers currently on the array:
>
> ea06-d301 073 110921|1417
> -d303 115 110919|1109
>
> ea07-d301 121 110906|1727
> -d303 119 110907|0748
>
> ea10-d301 001 111003|0904
> -d303 67 111003|1705
>
> ea12-d301 085 111003|1323
> -d303 99 111004|0812
>
> ea14-d301 125 110912|1325
> -d303 127 110908|1556
>
> ea26-d301 blank ???
> -d303 123 110919|1421
>
> ea15, ea28: no 3-bit samplers any more
>
> Note that ea26-d301 has no serial number in there -- maybe Mike can
> fix this?
>
>
> * Hichem fixed the MIB code per Barry's request, to ignore 3-bit
> power commands if the 3-bit sampler is already on. This should
> eliminate various oddities we saw in our last tests (Tuesday I think?).
> The most prominent problem from those earlier data sets was a reset of
> the 3-bit samplers 15-20 seconds after the beginning of each 3-bit scan.
> I believe this at least has been eliminated (thanks Hichem!) but am
> waiting to hear back from Vivek about the more subtle issues.
>
>
> -- Michael
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--
Keith Morris
National Radio Astronomy Observatory
1003 Lopezville Rd.
Socorro, NM 87801
575-835-7060 (phone)
575-835-7027 (fax)
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