Category Archives: Ideas
Software Radio Baseband Digitizer PCB
I’m plugging away at building an inexpensive, high-bandwidth software-defined radio receiver. I built a bunch of PLL+VCO boards, filter boards, and quadrature mixer boards. But I still don’t have a good ADC to sample the signals I’m receiving. No longer! … Continue reading
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ADF4350 VCO+PLL Breakout Board
I’m a software radio freak. When I first heard about the Analog Devices ADF4350, a PLL+VCO that can tune between 137.5 and 4400 MHz, I was obsessed with getting one and building it into my projects. Naturally, the first step … Continue reading
Track The ISS Yourself Using PyEphem
How to track the International Space Station with twenty lines of Python code. Continue reading
Signals from Space! (part 2, and a Chronulator contest)
Quick recap: In part 1, I captured weather satellite signals with my software-defined radio prototype, using the audio input on my laptop. So, what can be done with these captured signals? The first thing I did after recording the NOAA-19 … Continue reading
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Signals from Space! (part 1)
I attempt to receive weather satellite signals with my software radio prototype — with surprisingly good results! Continue reading
Software-Defined Radio Receiver: first signals!
I’m building a 100MHz to 1GHz software-defined radio receiver, trying to keep it as small and affordable as possible, while still being very flexible. Today my prototype hardware produced its first signals! Continue reading
Comments [25]
FM Synthesis!
More progress on my “audio Arduino” prototype: I got FM (frequency modulation) synthesis working a few days ago, but it didn’t sound terribly interesting. Then I spent a couple of days building C headers for the STM32F205 processor (libopenstm32 and … Continue reading
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Fear The Bus Pirate, For It Is Awesome
I got my Bus Pirate today, just in time to talk to my project’s audio codec via I2C. It is no exaggeration to say the Bus Pirate saved me a metric crap-ton of time. In about ten minutes, I had … Continue reading
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Audio Project Trade-offs
I want to build a device that serves the audio experimenter in the same way the Arduino serves the artist community. The Arduino won’t do the job for audio because AVR8s are woefully underpowered (max clock speed, multiplier performance, very … Continue reading
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Kevin Thornbloom’s Chronulator
Kevin writes: After seeing some other great Chronulators on flickr that join the two meter panels into one display, I knew that’s where my design would go. I made a simple box out of Red Oak, and stained it dark. … Continue reading
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