The plots can be found at:

The system temperature is computed using the total power
information (0 lag). If [K] is kelvins and [corTP] are

correlator total power units (linear in power but arbitrary) then:

delta[corTP]= calOn[corTP] - calOff[corTP] gives the size of the cal in [corTP] units

calTPtoK = calSize[K]/(delta[corTP] is the size of the cal in K / size of the cal in [corTP] so it

will convert [corTP] to kelvins

Tsys[K] = calOff[corTP] * calTPtoK is the system temperature.

Tsys is computed for the calOff scan so
that the cal is not included. When computing (calOn - calOff) we
assume that the difference is only do to the cal. For small cals and high
zenith angle, there is a small change from tsys(za) dependance since
we continue to track the same position in the sky for the calon and caloff.

- There are two plots for each data set. One has the data labeled with + polA, * polB . The second plot has both Pols labeled with a period so you can see the fit to the data.
- The 3rd order fit is: Tsys[za] = c0 + c1*za + c2*(za-14)^2 + c3*(za-14)^3 where za is in degrees and the last two terms are only included for za > 14. The polA coefficients are in column 1 and those for polB are in column 2.
- The sigmas for the final iteration of the fit is in degrees kelvins.
- the number of points started with and the number of points used in the final fit.
- what sigma value was used to iterate the fit.
- The bandwidth * integration time is of order 10Mhz*10 seconds so 1/sqrt(b*tau) or .01 %. For system temperatures of 30-40 K this is 3milliKelvins. The fit rms of order .5 kelvins for lband is most likely from confusion .

- The Tsys(za) curve is not flat for 0 to 15 degrees for lbw,lbn. It is flag for sbn and cband. These receivers differ in the horns illumination of the tertiary. If this is a tertiary spillover problem then we still need to find a reason why the spillover is a function of za. It might be a good idea to revisit the reasons why we wanted to overilluminate the tertiary with these horns.
- The Tsys(za) curve turns up at 15 degrees rather than 17 degrees. Is this from the taper of the beam illumination on the dish, diffraction, or is the ground screen seeing some of the ground?

- lbn 1400-1425 Mhz
- lbw 1300-1425 Mhz circular polarizations
- lbw 1650-1670 Mhz
- sbn

polA Tsys(za)=29.474 + .13599*za + .215752*(za-14)^2 - .020024*(za-14)^3

polB Tsys(za)=27.315 + .12809*za + .207750*(za-14)^2 - .019014*(za-14)^3

polA Tsys(za)=36.550 + .12215*za + .237660*(za-14)^2 - .015145*(za-14)^3

polB Tsys(za)=35.739 + .14101*za + .197705*(za-14)^2 - .007744*(za-14)^3

polA Tsys(za)=34.556 + .10924*za + .215577*(za-14)^2 - .017823*(za-14)^3

polB Tsys(za)=34.382 + .09409*za + .241162*(za-14)^2 - .020710*(za-14)^3

polA Tsys(za)=26.000 - .00016*za + .078998*(za-14)^2 + .005007*(za-14)^3

polB Tsys(za)=25.127 - .00738*za + .061695*(za-14)^2 + .009357*(za-14)^3

processing: x101/tsys/Readme for a description

plotting : x101/tsys/plotall.plt

home_~phil