[evlatests] Initial Results -- 2 GHz-wide data.

[Michael Rupen]

>    ea06 shows various strange modulations, which are *different between
> subbands and polarizations*!!!  Gotta be a correlator issue.

This sounds like you see modulations in *all* subbands and polarizations.
If so this is intriguingly different from its behavior in OSRO data,
where only ea06-B has problems. Of course there we see only one subband
per IF, but still that leaves 3 subband/pol'n pairs free of problems.

>    ea12 shows, on all subbands and polarizations, single-record drops
> of 10% in amplitude.  These are perfectly regular -- once per minute, on
> the minute.

ea12 also shows occasional gain jumps at scan boundaries in OSRO data.

>    ea20 shows, on all subbands and polarizations, a regular ~6%
> modulation in amplitude, with a period of a few minutes.  The modulation
> is not sinusoidal -- there is a steady level, then a gaussian-looking
> dip, then a return to the normal level, and the pattern is repeated.

This is present in all bands I've checked so far (C X K), with the
amplitude of the modulation increasing with band frequency.  At C band
in the OSRO data the shape of the modulation (but not its period) is
different for the two IF pairs.

             Michael