Dish sizes required to receive the downlink
This map seems to be based on the output power of the satellite power amplifier being split into two beams on the downlink - half the power going to the North America beam and half to this illustrated South America beam.
With the satellite switches configured like this, you would expect the single carrier saturated downlink eirp to be reduced by 3 dB.
The downlink eirp values shown in tiny red print are 50.95 peak, 46.00, 44.00 and 40.50 contours. This does not make sense to me. We have somehow lost 4.95 dB between the beam peak and the innermost B contour. I would have expected about 0.1 to 0.5 dB between the beam peak and the B contour.
This map seems to be based on the input of the satellite receiver being connected to both the North America beam and this illustrated South America beam. This reduces the uplink G/T by about 1.5 dB.
The uplink G/T values shown in tiny red print are 9.50 peak, 4.00, 2.00, 1.00 and -1.50 contours. This does not make sense to me.
I don't understand how you can lose 5.5 dB of G/T between the beam peak and the B2 contour.
