[evlatests] doppler tracking

Gustaaf van Moorsel gvanmoor at nrao.edu
Tue Jul 24 10:41:45 EDT 2007


I can now confirm that both IFs exhibit the behavior I described
yesterday (crossed baselines correlate when the Fluke is even, and
fail to do so when the Fluke is odd).

Gustaaf


Barry Clark wrote:
>> From: Ken Sowinski <ksowinsk at nrao.edu>
>>
>> Might this be related to the fact that we have 1 Hz tuning
>> resolution for IFs A and D, but only 2 Hz for IFs B and C?
> 
> Yes.  I had been assuming that the A & D Flukes were the masters in
> that relationship.  If, instead, B & C are the masters, then the VLA
> is inherently incapable of tuning to an odd number of Hz.
> 
> Probably best fixed in obs2script.  (Quick and dirty would be to just
> drop the Hz digit altogether.)
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