[amsat-bb] Re: 150 cubesats to provide global WIFI multicasting
m5aka at yahoo.co.uk
Mon Feb 10 11:43:23 PST 2014
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
Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
More information about the AMSAT-BB