[evlatests] P-band -- IF 'B' failure
Ken Sowinski
ksowinsk at nrao.edu
Mon Jul 2 11:14:01 EDT 2007
On Mon, 2 Jul 2007, Rick Perley wrote:
> I reported earlier that on the 2nd run of AD562 (P-band, yesterday),
> there were no fringes from any of the EVLA antennas, on IF 'B'.
>
> I must amend that report:
>
> The two arrays (VLA and EVLA) are incoherent with each other in that
> IF. That is, VLA antennas fringe with VLA antennas, and EVLA antennas
> fringe with EVLA antennas. The problem is hence likely to be with the
> Fluke synthesizers being set at the wrong frequency. These data are in
> spectral line, so perhaps it will be useful to look at some spectra ...
>
> This problem has been noted before! The real mystery is why it
> comes and goes.
Sounds Fluke-ish. In Dwaraka's first run early Saturday IF B
was OK and there were no data interruptions. Surely a conincidence.
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