Category Archives: modulation

A Dangerous Demonstration of the Power of Radio

Terrestrial radio may be a dying medium, but there are still plenty of listeners out there. What would a commute to or from work be without a check of “Traffic on the Eights” to see if you need to alter your route, or an update of the scores from yesterday’s …read more

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Posted in am, antenna, broadcast, corona, discharge, modulation, plasma, radio, radio hacks, tower | Leave a comment

Bitluni Brings All the ESP-32 Multimedia Hacks to Supercon

Of all the people I was looking forward to meeting at Supercon, aside from my Hackaday colleagues with whom I had worked for five years without ever meeting, was a fellow from Germany named Matthias Balwierz. The name might not ring a bell, but he’ll certainly be familiar to Hackaday …read more

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Posted in 2019 Hackaday Superconference, bitluni, cons, dac, dma, ESP-32, espressif, I2S, Microcontrollers, modulation, pal, vga, xtensa | Leave a comment

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 voice transmissions, and the occasional flute-like warble of radioteletype signals. Now, the ham bands are …read more

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Posted in amateur radio, fft, ham, hash, misc hacks, modulation, PACTOR, PSK, radio hacks, rtty, Shazam, SigID | Leave a comment

RF Modulation: Crash Course For Hackers

When you’re looking to add some wireless functionality to a project, there are no shortage of options. You really don’t need to know much of the technical details to make use of the more well-documented modules, especially if you just need to get something working quickly. On the other hand, …read more

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Posted in ask, FSK, Hackaday Columns, LoRa, modulation, OOK, radio hacks, RF, wireless, Wireless Module | Leave a comment

Hiding Data in Music Might be the Key to Ditching Coffee Shop WiFi Passwords

In a move guaranteed to send audiophiles recoiling back into their sonically pristine caves, two doctoral students at ETH Zurich have come up with an interesting way to embed information into music. What sounds crazy about this is that they’re hiding data firmly in the audible spectrum from 9.8 kHz …read more

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Posted in audible, data encoding, Frequency modulation, masking frequencies, modulation, music, ofdm, steganography, wireless hacks | Leave a comment

Musical Mod Lets MRI Scanner Soothe the Frazzled Patient

Hackers love to make music with things that aren’t normally considered musical instruments. We’ve all seen floppy drive orchestras, and the musical abilities of a Tesla coil can be ear-shatteringly impressive. Those are all just for fun, though. It would be nice if there were practical applications for making music from normally non-musical devices.

Thanks to a group of engineers at Case Western Reserve University in Cleveland, there is now: a magnetic resonance imaging machine that plays soothing music. And we don’t mean music piped into the MRI suite to distract patients from the notoriously noisy exam. The music is …read more

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Posted in exam, filter, gradient coil, Lorenz forces, Magnetic resonance imaging, Medical hacks, midi, modulation, mp3, mri, music, musical hacks, RF | Leave a comment

Mike Ossmann and Dominic Spill: IR, Pirates!

Mike Ossmann and Dominic Spill have been at the forefront of the recent wave of software-defined radio (SDR) hacking. Mike is the hardware guy, and his radio designs helped bring Bluetooth and ISM-band to the masses. Dominic is the software guy who makes sure that all this gear is actually usable. The HackRF SDR is still one of the best cheap choices if you need an SDR that can transmit and receive.

So what are these two doing on stage giving a talk about IR communication? Can you really turn traffic lights green by blinking lights? And can you spoof …read more

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Posted in infrared, Interest, interview, Interviews, ir, mike ossmann, modulation, Traffic Lights, wireless hacks | Leave a comment