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

[M5AKA]

Hi Michael, 

It'll be a weak lower-bit rate 802.11 signal since a 1U CubeSat could only provide an RF output of around 0.4 watts at 2400 MHz but it's certainly feasible. 

Signals probably won't be receivable in urban areas due the strength of other WiFi signals but my understanding is the system is aimed for areas of the world where WiFi isn't available.

Syed Karim project lead of Outernet says: "The signal on the ground will be fairly weak, in order to not interfere with local networks. At this time, we're shooting for receive sensitivity of about -90dBm"

Of course that's slightly disingenuous - it's not a weak signal because they don't wont to interfere with local networks, it's a weak signal because that's the best they can do, there is no-way they can generate a strong signal. 

If they could go for a 3U CubeSat they could use higher power (1W) and have a fold out 2400 MHz dish antenna such as that on Aeneas http://amsat-uk.org/.../amateur-radio-cubesats-to-launch.../


73 Trevor M5AKA




On Saturday, 8 February 2014, 10:55, Michael Chen <michael.bd5rv at gmail.com> wrote:
 
Maybe my knowledge is out dated, or is this another fiction?

https://www.outernet.is/

Guys responsible for frequency coordination will freak out for such project. :)

发自我的 iPhone

Michael Chen, BD5RV
AMSAT-CHINA


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