[evlatests] Antenna 23 is tardy

[Doug Whiton]

Please be more specific, if you can.  Are you complaining about AZ or EL? 
How much of a difference from other antennas on the same arm are we
talking about?   Specs are 20 deg/min for EL and 40 deg/min AZ.  We allow
a + or - 5% window.  That's 1 deg/min in EL and 2 deg/min in AZ.

We looked at both AZ and EL this morning.  El slewed at 22 deg/min down
and 21 deg/min up.  AZ slewed at 38 deg/min both CW and CCW.  We can
easily
set the speed with digital tachs.  They will be installed when the antenna
comes in to finish the overhaul.  Until then, I am inclined to do nothing,
unless you have some more information.

Doug



> On Sun, 4 Jul 2010, Michael Rupen wrote:
>
>> This has been true for years.
>
> Many years, in fact.
>
>>>    Based on some tests taken early Sunday morning, it is clear that
>>> antenna 23's slewing speed is slower than any other -- it is
>>> consistently the last antenna to get on source after a long slew.
>>>
>>>    Can somebody notify servo?
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--
Doug Whiton
National Radio Astronomy Observatory
Servo/MOS Group Leader
575-835-7417