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Long-distance High Frequency APRS Tracking Using The FreeTrak63
If you dabble in the ham radio hobby we’re sure you’ve heard of GPS position monitoring or tracking using APRS packet data commonly transmitting over the VHF ham band and FM modulated. One of the...
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Direct Digital Synthesis (DDS) Explained by [Bil Herd]
One of the acronyms you may hear thrown around is DDS which stands for Direct Digital Synthesis. DDS can be as simple as taking a digital value — a collection of ones and zeroes — and processing it...
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Demodulating BPSK31 With OpAmps and 555s
BPSK31 is an extremely popular mode for amateur radio operators; it’s efficient and has a narrow bandwidth and can be implemented with a computer sound card or an Arduino. Just like it says on the tin,...
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Name that Unknown RF Signal with a Little FFT Magic
Time was once that the amateur radio bands were an aurally predictable place. Spinning the dial up and down the bands, one heard familiar sounds – the staccato of Morse, the [Donald Duck] of sideband...
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Reverse Engineering a Better Night’s Sleep
All you want is a decent night’s sleep, so you decide to invest in one of those fancy adjustable beds. At first, it’s fine — being able to adjust the mattress to your needs on the fly is a joy, and...
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