Author Archives: jboone
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
Chronulator code now on GitHub
ShareBrained projects are now on GitHub. ShareBrained sharing, properly now! Continue reading
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Signals from Space! (part 3)
In the last two parts, I used my homebrew software-defined radio to receive weather image signals from the NOAA-19 satellite and spent some time trying to calculate the satellite’s speed using frequency shift measurements. This time around, I’m going to … 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
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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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First Audio!
I’m working on a low-cost audio synthesis platform — kinda like an Arduino, but with much higher audio capabilities. And tonight, I got my first synthesized audio out of it! Here it is, generating two sine waves (tuned at A440 … 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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