[evlatests] Antenna 4 Ka-band results

[Robert Hayward]

Thanks Ken. My mail program generated a similar mess.

Do you suppose someday we can convince Rick to use spaces rather than 
tabs in his tables?

-Bob


Ken Sowinski wrote:
> My mail reader made a mess of Rick's table.  I made it
> a little neater and maybe even got all the numbers in
> the right columns.
> 
> 
>      Bob, Brigette, and I spent most of Friday on antenna 4.  Weather was 
> clear, dry (DP ~ 15 F) hot (Temp ~ 85F), and calm.
> 
>      Detailed results will be given later.  I did a relatively quick 
> calibration of all the data.  The results are summarized below.
> 
> 
> Freq.    Tsys    Tr     Tat  Tspill    Tcal  T(3C273)  Effic.
> -------------------------------------------------------------
> 26232    71.7    42     6.2    23.5    6.10    2.32      52%
> 28024    49.4    20.5   5.4    23.5    7.55    2.33      52
> 33144    55.1    22.1                  5.17
> 33160    56.8    22.7                  5.15    1.89      42
> 37000    62.9    29.8   7.8    25.3    3.42    1.70      38
> 38064    68.0    34.3   8.7    25.0    3.40 
> 39600    74.5    39     9.2    26.3    2.40     ???     ???
> -----------------------------------------------------------
> 
>      Explanations:
> 
>      Blanks mean that quantity was not determined in these observations. 
> The Tat, Tspill, and effics. have been determined from earlier 
> measurements, with results that fit the trends shown in the table.
>      The Efficiency is based on a flux of 3C273 = 25 Jy.  Craig tells me 
> the VLBA measurements give 28.5 Jy at 22 GHz, and 24.5 Jy at 43 GHz. 
> The values above will be close to real ...
>      The ??? in the table are a results of a very unstable measurement of 
> 3C273 power at 39.6 GHz.  A best value is 2.0 K, which leads to an 
> improbable 45% efficiency.
>      The spillover contribution is too high (compared to K and Q bands) 
> by at least 10K at all frequencies.  The slow rise in Tspill is 
> certainly real, but is likely due to an increase in the 'real' spillover.
> 
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