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Assume a test array of 50 12x12 centimeter 2 watt thinsats, deployed from a 2U cubesat. Effective transmit power, perhaps 2 watts, effective transmit antenna area, 12 x 600 centimeters, making a steerable asymmetric beam 0.1 by 0.002 radians, EIRP 125 kW. From GEO (40,000 km path length), with a 2 meter tracking receive dish, that would deliver 20 picowatts to the receiver. Assuming kT = 0.05 eV = 8e21 J at 600 K effective noise temperature, and 5 kT per bit, that is 4e20 W/bps, or 500 Mbps  more than a 50 MHz channel can support. Assume 100 Mbps downlink  plenty of bandwidth to return a lot of scientific information from the test array.  Assume a test array of 50 12x12 centimeter 2 watt 5 gram thinsats (100 watts total power), deployed from a 2U cubesat. Effective transmit power, perhaps 2 watts, effective transmit antenna area, 12 x 600 centimeters, making a steerable asymmetric beam 0.1 by 0.002 radians, EIRP 125 kW. From GEO (40,000 km path length), with a 2 meter tracking receive dish, that would deliver 20 picowatts to the receiver. Assuming kT = 0.05 eV = 8e21 J at 600 K effective noise temperature, and 5 kT per bit, that is 4e20 W/bps, or 500 Mbps  more than a 50 MHz channel can support. Assume 100 Mbps downlink  plenty of bandwidth to return a lot of scientific information from the test array. 
24 GHz Amateur Radio Band
for the first server sky experiments
The first server sky experiments may use the 1.2 centimeter ham bands, 24.00 to 25.05 GHz, using a global network of amateur radio operators for the ground stations.
Assume a test array of 50 12x12 centimeter 2 watt 5 gram thinsats (100 watts total power), deployed from a 2U cubesat. Effective transmit power, perhaps 2 watts, effective transmit antenna area, 12 x 600 centimeters, making a steerable asymmetric beam 0.1 by 0.002 radians, EIRP 125 kW. From GEO (40,000 km path length), with a 2 meter tracking receive dish, that would deliver 20 picowatts to the receiver. Assuming kT = 0.05 eV = 8e21 J at 600 K effective noise temperature, and 5 kT per bit, that is 4e20 W/bps, or 500 Mbps  more than a 50 MHz channel can support. Assume 100 Mbps downlink  plenty of bandwidth to return a lot of scientific information from the test array.