[evlatests] Quick EVLA System Check

[Bryan Butler]

i might suspect secondary referenced pointing.  we have not (as far as i know) 
tested that mode very rigorously.  you might try the experiment again only using 
primary reference pointing to see what happens (if there is some free time on 
the array soon).

	-bryan


On 2/5/07 12:44, Rick Perley wrote:
> 
>     Primary referenced pointing was used at C, X, and K bands.  
> Secondary reference pointing (with X-band as primary) was used for Q-band. 
> 
>     Results:
> 

...

>     K-Band.
> 
> Completely bizarre results -- for *both* the EVLA and VLA. 
> Antennas 16, 17 and 24 are out, as noted above.
> All othres -- including all VLA antennas -- gave very weak fringes. 
> The bandpass solutions showed IFpair 1 (IFs A and C) to have an 
> effective bandwidth of ~5 MHz, centered on channel 8.  IFpair 2 (IFs B 
> and D) showed normal bandwidth, but were very noisy.
> The antenna gain program CALIB failed on nearly all antennas, both 
> IFpairs. 
> 
>     Q-band.
> 
> The same as K-band -- only weaker.     Bandpass solutions had the same 
> characteristics as at K-band.  No antenna calibration was possible -- 
> insufficient SNR. 
> 
>     Something very wrong here ...
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