[evlatests] More on 'Wobbles'

[Barry Clark]

My hunch is that the wobbles maximize not at u=0 on the baseline
showing them, but at u=0 on the baseline from one of the antennas
to antenna ea08 - which is the time when the delay rate through the
delay module is zero.  Which might take care of your ea02 exception.

Rick Perley wrote:
>     Barry noticed a possible geometric relation amongst the 
> antennas/baselines that I reported on having the 'wobble' present, so I 
> looked a little deeper.  There might be something here ...
> 
>     Seven baselines showed notable 'wobbles'.  For each of these the 
> wobble amplitude reached a maximum -- it's clear that this maximum is 
> because the 'wobble frequency' goes through zero, so the loss of signal 
> due to the 1 second averaging is minimized. 
> 
>     Two baselines had their maximum (zero frequency rate) at transit.  
> Both of these baselines are along the north arm.  The zero wobble 
> frequency is thus at u = 0, when the fringe rate is zero. 
> 
>     Three baselines had their maximum at a large positive hour angle -- 
> all three are aligned along the west arm, and again, the minimum wobble 
> frequency rate occurs at or near u = 0. 
> 
>     Two baselines had their maximum amplitude at a large negative hour 
> angle, and (you guessed it!), these baselines lie along the East arm.
>     But the relation isn't perfect, for one of these two east-arm 
> alignments is actually significantly skewed -- 2 x 10 is E2 x N3, so 
> this is an azimuth midway between the north arm and east arm.  The 
> maximum wobble amplitude on this baseline, if it should occur at u = 0, 
> would have been at 07:28 IAT.  In fact, it was at 05:40 IAT -- nearly 
> two hours earlier. 
> 
> 
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.cv.nrao.edu
> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests