12 Feb
2014
12 Feb
'14
4:19 p.m.
Hello Fabio, from experience with FITSAT-1,the launch took place from the ISS( orbit ~ 400km). The lifetime will be up approx. 9 months. This is consistent with the observations of other satellites in this orbit height. But, this is influenced by the shape and size of the satellite.
73´s de Michael, DD5ER
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Am 12.02.2014 15:45, schrieb Fabio Azzarello:
> Hello everybody,
> I agree with Trevor, GS requirement for the 2.4 GHz band are quite
> "challenging".
>
> Anyway, I have another question, what kind of orbit this constellation will
> be designed for?
> If it is less than 500 km, how many *months* will it last?
>
> 73s
> Fabio
> iz5xrc
>
>
> On Mon, Feb 10, 2014 at 8:43 PM, M5AKA m5aka@yahoo.co.uk wrote:
>
>> 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@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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