[evlatests] setting reference antennas

[Ken Sowinski]

On Tue, 22 Jul 2008, Bryan Butler wrote:
>
> Ken Sowinski wrote:
>> 
>> You lose the pointing and phasing history.
>
> could you elaborate on this?  what do you mean?

My understanding is that pointing and phase results do not persist
between scripts.  If a script is interrupted after a pointing or
phasing scan and then restarted the information learned is now lost.

>> It is clumsy for files in durations.
>
> how so?  seems to me the mechanism is exactly the same for durations or 
> stop times.

A duration file, if started over, begins at the beginning not where
it left off.  That addresses my first concern, but means more time
than was expected is used for the observation.

>> Someone has to edit a file with the chance of making mistakes.
>
> indeed, but we have this vulnerability however we choose to do it, throughout 
> the system.

Clicking on a button to select a reference antenna may not be
as prone to error as editing a file.

Ken