[evlatests] Friday L band

[Ken Sowinski]

On Fri, 7 Apr 2006, Barry Clark wrote:

> We were going to try pointing at L band in a subarray.  Didn't work.
>
> 1.)  Modcomps appear to require at least one VLA antenna in a subarray
> or they don't record data.

Right.  The modcomps want to see at least one antenna on source
before writing data, but evla antennas always appear to be off
source.  This was talked about when we started with antenna 13
long ago, but not enough.

As Barry pointed ou later the ffset Rick reports is the builtin
tilt of the pad.  I was hoping to see the result from pointing
run before introducing that to help improve the odds of getting
the signs right.

> 2.)  System was feeling not at all well at L band.
>    Antenna 13 AC - Large phase wind.
>    Antenna 13 BD - Low amplitude, but stable

BD has been worse ever since the antenna moved.  No  idea
why, but Rick's report on the funny bandpass should provide
some clues.