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Registered Member #505
Joined: Sun Nov 19 2006, 06:42PM
Location: Yorkshire!
Posts: 329
Chris Russell wrote ... Interesting! It's quite fun to entertain the notion of launching our own satellite into orbit, but I tend to agree that it would be wise to wait for a successful launch before making any serious plans
I 100% agree! We are going to have to wait until Q4 2010 before launches start so we've got a way to go yet.
With 32 tubesats at $8000 each = $256k. I'm assuming that this is a way of offsetting the launch costs of the main payload rather than these tubesats being the actual main payload...
I have emailed them for more details about the kit and the equipment that is provided with the tubesat...
wrote ... Each TubeSat kit includes the satellite's structural components, safety hardware, solar panels, batteries, power management hardware and software, transceiver, antennas, microcomputer, and the required programming tools.
... but haven't had a response yet. Will let you all know if I do.
Was slightly concerned about the temperature rating / perfomance of these components. What is the temperature in low earth orbit? Obviously there will be huge variations depending on if the sat is in the sunlit area or not.
Regarding the radio system, how could you ensure a clear channel? With 32 other tubsats potentially transmitting you'd need at least that many bands available.
Registered Member #84
Joined: Thu Feb 09 2006, 01:06PM
Location: Dallas, TX
Posts: 47
thedatastream wrote ...
Was slightly concerned about the temperature rating / perfomance of these components. What is the temperature in low earth orbit? Obviously there will be huge variations depending on if the sat is in the sunlit area or not.
TI sells some space rated parts like the following:
Not that you would be buying that specific part, but you can get some ideas from the datasheet. Temp range is from -55C to 125C and they come in a ceramic package.
Registered Member #16
Joined: Thu Feb 02 2006, 02:22PM
Location: New Wilmington, PA
Posts: 554
thedatastream wrote ...
Regarding the radio system, how could you ensure a clear channel? With 32 other tubsats potentially transmitting you'd need at least that many bands available.
The amateur radio allocations offer several different frequency ranges for satellite operation, including 28MHz, 146MHz, 435MHz, 1.2GHz, 2.4GHz and 5GHz. All of these offer large chunks of bandwidth that, if channelized, equate to a 2 dozen or more channels per band.
The website says that they intend to deploy the satellites in such a manner to avoid clustering. By using CTCSS tones on the ham bands, its feasible to have a few tens of satellites on the 146MHz band alone. We already have over a dozen in the ham radio fleet that have been happily coexisting for several decades, though they're spaced far enough apart that they don't fight for bandwidth very often at all.
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TubeSat - DIY Satellite Kit
