Subject: Tsys system temperature frequency dependence antenna feed

For a long time, I've wanted to do a quantitative study of the antenna
system temperature versus frequency. Today I discovered a way to plot
all antennas on the same graph, by normalizing the data to the Tsys
value at a single frequency (1430).

The relative system temperature is
Tsys(f) / Tsys(1430 MHz)

Thanks to Aaron's work, last week we took measurements at 1.43. 3.04,
and 8.4 GHz. On a log-linear plot, the data fit a nice straight line. 
The graph below shows the individual antenna graphs for 13 antpols