27 Aug '13, 2pm

Software-Defined Radio, Part II

Software-Defined Radio, Part II

Photos: Stephen Cass(2) Old and New: Tuning in long-wavelength bands with my software-defined radio meant digging out old plans for a random-wire antenna and a matching network. I threaded the antenna wire through my building’s roof deck [top] and connected it to a home-built matching network [bottom right] that I’d connected to an upconverter board [bottom left]. The board shifts wavelengths into the range that my USB tuner dongle can accept and digitize before passing signals on to my laptop. A couple of months ago, I wrote about how a cheap USB dongle designed to pick up digital television broadcasts could be hacked to act as a software-defined radio, or SDR. With this dongle and a TV antenna, I could decode an impressive range of analog and digital radio transmissions from about 50 megahertz up to a little over 2 gigahertz [see “A $40 Software-Defined Radio ,” IEEE Spe...

Full article: http://spectrum.ieee.org/geek-life/hands-on/softwaredefin...

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