[amsat-bb] Re: 150 cubesats to provide global WIFI multicasting

[M5AKA]

Yes, a dish needed, ISS HamTV provides a good illustration of the requirements to achieve a 2 Mbps downlink at 2400 MHz. 


73 Trevor M5AKA




On Monday, 10 February 2014, 18:16, Howie DeFelice <howied231 at hotmail.com> wrote:
 
Just in case anyone was curious about the practicality of actually transmitting WiFi from a cubesat, I did a quick link budget. Based on typical 802.11 specs, the MDS of a receiver is about -90 dBm. The path loss at 2.4GHz between a ground station and a satellite overhead in a 600Km orbit is a little over 155 dB. Assuming a zero gain antenna on the typical WiFi client radio, the required EIRP from the cubesat is in the neighborhood of 4KW.  I don't think we are quite there yet with current solar cell technology.... not to mention the difficulty keeping the PA cool :)

- Howie AB2S                             
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