VEGAS Sawtooth Problem

THIS PROBLEM WAS CAUSED BY A BAD BOF FILE FOR MODES 2 and 3

The problem

When the problem is present, the total-power spectrum appears to be split into eight bands. By comparing the passband spectrum with a "good" spectrum, it seems like the bands are coming out in the correct order, but with strange baselines.When present, it affects all eight banks identically.

When it Occurred

We observed for around twenty hours Fri/Sat/Sun 18/19/20th July, and took literally hundreds of scans, apparently without any problems (I have not review every single scan). We observed on Thursday July 24th, and the problem was present.

What modes does it affect?

It is present in modes 3,4 and 10. We have not yet tested any other modes.
Topic attachments
I Attachment Action SizeSorted ascending Date Who Comment
sawtooth_good.pdfpdf sawtooth_good.pdf manage 91 K 2014-07-30 - 08:00 RichardPrestage An example of a "good" spectrum
sawtooth_bad.pdfpdf sawtooth_bad.pdf manage 92 K 2014-07-30 - 07:59 RichardPrestage An example of the sawtooth problem
Topic revision: r4 - 2015-01-27, RichardPrestage
This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding NRAO Public Wiki? Send feedback