[evlatests] Preliminary results for aug 25 tests

[Peter Napier]

Remember that the old X-band feed on the EVLA feed cone is somewhat out 
of focus (to prevent blockage) so we expect a little less efficiency. 
This will be cured when the EVLA X band feed is installed.
Peter

Mmark Claussen wrote:
> I have taken a look at the data Ken took yesterday for the
> purpose of estimating the sensitivity of the antennas.  I 
> will report here on some preliminary results, i.e. the results
> for An 14 at X and C band.  Due to the birdies Ken mentioned
> in An 16 in his report, I haven't as yet completed the analysis
> for An 16.  At L band, there are resolution effects with 3C273
> which lead to closure errors when assuming it is a point source
> (there are probably these at the other bands as well, but this
> is most pronounced at L).
> 
> I list here the ratio of rms noise (both phase and amplitude)
> of An 14 to that of VLA antennas.  This gives some idea of
> the sensitivity of An 14 as compared with a VLA antenna.  As
> we have done in the past, this is computed over several (in
> this case 90) spectral channels for one integration record
> after flux and bandpass calibration.
> 
>                              X Band
>          IF A          IF B          IF C         IF D
> 
> Amp      0.97          1.25          1.52         1.29
> Phase    1.26          1.35          2.20         1.34
> 
>                              C Band
> 
> Amp      0.98          1.07          2.78         0.89
> Phase    0.95          0.93          2.80         0.90
> 
> 
> Something seems to be wrong with IF C, but otherwise these
> numbers are pretty encouraging.  The X band results could
> be explained by pointing ?   
> 
> More to come later.
> 
> Mark
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