[evlatests] 4-band fringes, antenna 14

[Walter Brisken]

Today Barry convinced antenna 14 to work at 74 MHz.  At the bottom is his 
description of what he did.  I've looked at the data and found:

1.	Fringes on all 4 IFs.  Stable ampltudes, reasonable bandpass 
shapes, and phases that were comparable to VLA antenna phases.

2.	My point source assumption for 3c405 is not very good, but the 
amplitudes of the ant14 fall in the VLA antenna range.  Stability (mostly 
due to source structure probably) is equally good to VLA antennas.

3.	Fringes stopped instantly (random phases, sudden drop in 
amplitude) at 19:36 when the executer was stopped.

-W

---------- Forwarded message ----------
Date: Thu, 13 Apr 2006 13:44:23 -0600 (MDT)
From: Barry Clark <bclark at aoc.nrao.edu>
To: wbrisken at nrao.edu
Cc: bclark at nrao.edu
Subject: 4

Got on source about 19:03 or so.  I threw in about 15db or so
attenuation by hand to get the T5s out of saturation in IFs A & C only.
Seeing what look like fringes, albeit rather weak.

At about 19:36 I stopped the Executor (which may make a little phase
wind), and drove antenna 14 a long way off source.  Encouragingly, the
fringes got a great deal weaker.  Antenna motion continued until about
19:41.   Stopped file about 19:43.