Computing the L-narrow Gain
THIS CURVE IS FOR USE FROM AUG 15, 2001 TO PRESENT

Data Description The Results The Plots

Data Description

Both the L-Narrow and L-wide receivers are sharing a gain curve obtained from data taken with the L-wide receiver on August 12-15, 2001 using the "spider scan" routine. A low frequency set of data was taken (1175,1300,1375,1415 MHz) and a high frequency set (1415,1550,1610,1666 MHz). The data results are for the average of the two polarizations (Stokes I/2). The southwest quadrant of the reflector had not yet had it's final adjustment when the August data was taken. The surface rms went from 5.5 mm rms (before) to < 1.8 mm after the final adjustment. So the August data had 3/4 of the dish with an rms < 1.8 mm and 1/4 of the dish with an rms of about 5.5 mm. In September, 2001 the southwest quadrant adjustments were finished and a few sources were remeasured.

Further information, plots of the fits, etc. can be obtained here

The Results

The fit is for 1415 MHz, and is in K/Jy. The zenith angle (za) and azimuth (az) are in degrees and the (za-14) terms are only used for za > 14 degrees.

Average Gain [(polA+polB)/2]:

gainavg(az,za,f=1415MHz) = 10.999 - 0.10291*za + 0.0134357*(za-14)2 - 0.0071745*(za-14)3 - 5.2154x10-08*cos(az) - 1.3225x10-07*sin(az) + 1.1642x10-08*cos(2*az) - 7.3761-07*sin(2*az) - 0.20990*cos(3*az) - 0.098026*sin(3*az)

gainavg(az,za,f=1175MHz) = 11.378 - 0.081304*za - 0.026763*(za-14)2 - 0.0026350*(za-14)3 + 1.0319x10-06*cos(az) - 3.1292x10-07*sin(az) - 7.5973x10-07*cos(2*az) - 1.9372x10-07*sin(2*az) - 0.17180*cos(3*az) - 0.046071*sin(3*az)

gainavg(az,za,f=1300MHz) = 11.265 - 0.095145*za + 0.004248*(za-14)2 - 0.0066783*(za-14)3 + 7.2271x10-07*cos(az) + 9.0897x10-07*sin(az) + 4.3958x10-07*cos(2*az) - 8.1956x10-07*sin(2*az) - 0.22135*cos(3*az) - 0.074295*sin(3*az)

gainavg(az,za,f=1375MHz) = 11.114 - 0.10412*za + 0.023915*(za-14)2 - 0.0094938*(za-14)3 - 8.3447x10-07*cos(az) + 1.0729x10-06*sin(az) - 4.5402x10-08*cos(2*az) - 1.3411x10-07*sin(2*az) - 0.22827*cos(3*az) - 0.080216*sin(3*az)

gainavg(az,za,f=1550MHz) = 10.786 - 0.10748*za + 0.019265*(za-14)2 - 0.0075530(za-14)3 - 7.8976x10-07*cos(az) - 6.5565x10-07*sin(az) - 7.4506x10-08*cos(2*az) - 4.1723x10-07*sin(2*az) - 0.20972*cos(3*az) - 0.14330*sin(3*az)


The Plots