[amsat-bb] Re: Rokot launch today with RS series sat?
m5aka at yahoo.co.uk
Wed Jul 4 09:35:06 PDT 2012
--- On Wed, 4/7/12, Lizeth Norman <normanlizeth at gmail.com> wrote:
> 2.4 is specified as a radiolink freq. The cam is described as a webcam. > Says something about an ISS mission specialist.
> Wonder if it is a real live 2.4 wifi device? Probably not something the
> average Joe or Jane could receive from home.
I think the ISS reference is to the spacecraft manufacturing company of that name http://www.iss-reshetnev.com/ rather than the space station.
I would imagine to stream lo-res video they'd ideally need a data rate of around 115 kbps, WiFi would be over-kill for that. It could be achieved with a signal occupying about a 100-150 kHz bandwidth which could be done on either 435 MHz or 2400 MHz.
The document says command uplink in the Primary 145 MHz band with downlink at 435 MHz but the reference to radiolink for 2400 MHz baffles me - link to what ?
I've not had a chance to look any further other that finding document, there may well be other papers on the satellite written by students/professors somewhere on the web.
Basically I've no idea, I guess we might find out on the 13th.
73 Trevor M5AKA
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