[evlatests] EVLA, April 6.

[Jim Jackson]

I concur with Rick's assessment.

I just checked the L302-2 synthesizers in Antennas 13 and 14.  The one in 
Antenna 14 was not locking at the frequency it was being set to by the 
currently running script.  I rebooted it's MIB, waited for the script to 
re-command it and it now seems to be locked. For whomever is looking at the 
data from the current script (551tstgm.obs) - it was around 5:30PM local 
when I did this. Hopefully IF's B&D on Antenna 14 improved - assuming the 
antennas aren't stowed for wind. The L302 in Antenna 13 looks fine at the 
moment.

As for 18C - the only thing I notice at the moment is that the RMS on IF-C 
is running 12-13 which is a little high. At the same time IF-A is 9-10. 
That doesn't seem to be enough difference that it would be totally dead but 
I suppose anything is possible.

Jim


At 04:29 PM 4/6/2006, Rick Perley wrote:
>    Some of this can be explained easily:
>
>    1) Ant 18 has only IFs A and C, so nothing from B or D can be expected.
>
>    2) Ant 18 has no LSC converter, so no L or C band data can be expected.
>
>    3) Ant 18 has no C band receiver either.
>    4) The lack of B or D data from antennas 13 or 14 would (I think) be
>caused by a non-functioning L302-2.  This needs to be looked into.
>    5) The only remaining mystery is the lack of data from antenna 18C. 
> There should be something here, since good data from 18A was obtained. 
> This needs to be followed up upon.
>    Unhappily, the winds are still howling up at the site.  We continue to 
> wait ...
>
>vdhawan at aoc.nrao.edu wrote:
>
>>A bit of data was taken earlier today in line mode, 12.5MHz, to check 
>>delays. Reference pointing was used to mitigate pointing errors.
>>
>>L, C, X band data were taken before the wind picked up.
>>
>>Basically the delays look OK. However, some IFs produced no data, and
>>some were sans fringes. Details below.
>>
>>Vivek.
>>
>>---------------------------------------------------
>>
>>G = Good, about the same as VLA.
>>D = Dead, autocorrelation bandpass but no fringes.
>>N = No data at all.
>>
>>L Band
>>
>>ant    1RR    2RR    1LL    2LL
>>
>>13     G      D      G      D
>>
>>14     G      D      G      D
>>
>>16     G      G      G      G
>>
>>18     N      N      N      N
>>
>>
>>
>>
>>C Band
>>
>>ant    1RR    2RR    1LL    2LL
>>
>>13     G      D      G      D
>>
>>14     G      D      G      D
>>
>>16     G      G      G      G
>>
>>18     N      N      N      N
>>
>>
>>
>>X Band
>>
>>ant    1RR    2RR    1LL    2LL
>>
>>13     G      D      G      D
>>
>>14     G      D      G      D
>>
>>16     G      G      G      G
>>
>>18     G      D      N      N
>>---------------------------------------------------
>>
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