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What is the difference between HackRF One, YARD Stick One, Ubertooth One, Software Defined Radio Mobile Kit?

Hi everyone, i need to implement a Software Defined Radio platform based in a FPGA processor. However before buying it i need to make sure of the requirements for the FPGA. I searched and i found the typicall specifications of an FPGA like the number of logic numbers, I/O interfaces.... But how can i know the exact specifications before implementing? Someone can help me to find the right FPGA or just tell some direction to go search to found/calculate the necessary requirements them? I greatly prefer some evaluation FPGA board instead of only the processor to speed up the implementation. Thanks for any help.

First of all, I'd like to acknowledge that my recent interest in this type of research was born out of watching Darren's video interview with Renderman. So hat doffed, cheers guys! I found recently that a certain type of radio in some PC TV dongles (RTL2832U) can be used to watch more than free to air TV. I just ordered one for £7 on amazon, That's mindblowingly cheap.! The idea is that you use these USB devices to look / listen to the radio waves being broadcast around you within a range of frequencies. It seems that within these frequencies, all the good stuff happens. This is probably old news to a few of you, but that's cool, as I'd love to invite you all to discuss this here with me and everyone else here on why this is so cool and interesting, and perhaps help us all understand the possibilities of this cheap technology for learning and research purposes. http://www.youtube.com/watch?v=tqUPj852FFY Apart from all the applications that seem to be be here already for Windows and Linux (sorry OSX users!), there are other considerations too.. One of them would be fairly relevant to HAK5 in a way, as a need for the understanding of antennas is something a lot of us are interested in due to the pineapple. Of course there are plenty more devices which are more capable to do this, but at a cost increase. here is a couple of links that I have found wealthy in information. http://rtlsdr.org/ http://sdr.osmocom.org/trac/wiki/rtl-sdr http://hackaday.com/?s=sdr http://www.reddit.com/r/rtlsdr One more thing.... Someone made a way to use a DJ Controller as a way to control the interface of the software. http://www.dh1tw.de/powersdr-ui Now, that is awesome!