[evlatests] Ant.20 servo / PN3DB

[Vivek Dhawan]

The attached plot shows the data normalized to the last 1 minute.

EA20 has a strong modulation in elevation (the last 15 min) at 3.5
minutes per cycle, with elevation rate 0.205 deg/minute, so this is
the 0.7deg/cycle syndrome - I'm uncertain if that is the gain or
offset errors, but its clearly the elevation encoder.

The pointing results from a recent run (june 20) also varied over
time by +_ 0.8 arcmin for ea20 in elevation; azimuth was much better.


-------- Original Message --------
Subject: EVLA Operator Log  2010-06-26_1052_PN3DB (fwd)
Date: Sat, 26 Jun 2010 11:48:01 -0600 (MDT)
From: Ken Sowinski <ksowinsk at aoc.nrao.edu>
To: Vivek Dhawan <vdhawan at aoc.nrao.edu>

Vivek,

Another 3 dB pointing test trial, mostly to see how bad
ea20 is.  I suppose it is sufficient just to plot amplitudes
as a funtion of time for the duration of the observation.

It ran this morning about 11 UT.

Thanks,
Ken

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