:: NEWS COCKTAIL aka BlahBlahBlog ::

:: 6.06.2006 ::

:: "GNU Radio Opens an Unseen World" ::

Matt Ettus has the sly smile of someone who sees the invisible. His hands fly over the boards of his Universal Software Radio Peripheral, or USRP, snapping them together with an antenna like Lego bricks. Then he plugs in the naked boards to a USB 2 cable snaking to his Linux laptop.

After few minutes of normal Linux messing around ("Takes forever to boot.... Haven't got the sound driver working yet....") he turns the laptop around to reveal a set of vibrating lines in humps and dips across the screen, like a wildly shaking wireframe mountain range. "Here," he explains, "I'm grabbing FM."

"All of it?" I ask.

"All of it," he says. I'm suddenly glad the soundcard isn't working.

Radio is that bit of the electromagnetic spectrum that sits between brain waves and daylight. It's made of the same stuff that composes light, color, electrical hums, gamma radiation from atom bombs, the microwaves that reheat your pizza.

From our perspective, radio devices behave very differently -- a global positioning system gadget doesn't look like a TV doesn't look like a CB set, even if they are all radios. They are single-purpose machines that use small bits of radio spectrum to do very specific tasks -- about as far from the general-purpose personal computer as you can get. But there's no reason they have to be.

Most of the required components of a radio are the same and can be generalized. And with Moore's law making processors fast enough, much of a radio's function can be done with software.

Read more here.

posted by me

:: 1:12:00 AM [+] ::
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