[evlatests] ea17 & ea25 phase jump problem

[Claire Chandler]

Correction, so far we have seen this at L, Ku, and Ka-bands.

Claire

On Fri, 1 Feb 2013, Claire Chandler wrote:

> In the pipeline-calibrated datasets from this last week we have been seeing 
> phase jumps at scan boundaries on ea17 and ea25 in observations that use the 
> 8-bit system at L, Ku, and K-bands (phase plot attached; other bands may also 
> be affected, but we are limited to what our observers are using in this 
> diagnosis).  3-bit observations do not seem to be affected.  The phase jumps 
> occur on all 8-bit IFs (A0C0 and B0D0), and show multiple (but stable, within 
> scans) phase states.  We are having to advise our users to flag these two 
> antennas completely.  Is this a cable length problem?
>
> Claire
>