[evlatests] Wobbleitis remains ...

[Rick Perley]

    Michael took some data with 0.2 second dumps, at C-band on 3C273.  
Vivek gave a brief report (below) -- this one is a bit more detailed.  
As always, the effect is seen equally in both polarizations and on both 
subbands. 

    1) There are clear wobbles, but are clearly visible on only a few 
baselines. 

    2 x 6:  1.5 second period in phase, barely visible in amplitude
    2 x 10:  6 second period in amplitude, 3 second period in phase.  
Easily seen on both.
    2 x 18:  1.5 second period in amplitude 0.75 second period in phase. 
    6 x 18:  1.5 second period in phase, not easily seen in amplitude.
    9 x 27:  1 second period in phase, barely visible in amplitude. 

    2) Antenna 25 shows apparent phase 'wobbles' on all baselines, but 
these look more like delay 'clunks' -- the antenna is at N2. 

    3) There are numerous examples of apparently period structures, most 
easily visible in amplitude, on all sorts of baselines.  But they are 
not clearly sinusoids, as are so easily seen on the baselines listed 
above. 

-------- Original Message --------
Subject: 	Re: Wobblies
Date: 	Wed, 27 Oct 2010 15:21:05 -0600
From: 	Vivek Dhawan <vdhawan at aoc.nrao.edu>
Organization: 	NRAO
To: 	Michael Rupen <mrupen at aoc.nrao.edu>
CC: 	Rick Perley <rperley at aoc.nrao.edu>, Ken Sowinski 
<ksowinsk at aoc.nrao.edu>
References: 	<Pine.LNX.4.64.1010271008520.1063 at scamper>



Plenty wobbles, e.g. all baselines to stations e.g. ea3 C and ea25 ABCD.

And particular baselines e.g. ABCD on 2-18, 6-18, 16-18,18-22, 2-6, 2-10,
2-22.

On to more tests with special f-shifts and/or special integration times.

Michael Rupen wrote:
> Hi Wobblers,
> 
>   if you're feeling strong, have a look at C_fast_003.55496.66091173611 --
> a short file with 200msec integrations.  Would be fun to know whether
> SysPower looks OK as well.  Main question: are there wobbles?  and if so,
> where?
> 
>   Cheers,
> 
>           Michael
>