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Hans knows the truth is out there
You never know what radio signals you might pick up if you just stop and listen. That’s why Hans built a simple and tiny receiver capable of detecting QRSS (extreme slow speed continuous wave) transmissions on a fixed frequency, such as 10.14MHz. The device is powered by a computer's USB port and the audio output feeds into the PC’s sound card and it can hook straight into a laptop for top secret missions. Hans used a toroidal transformer as matching and input filter, connected directly to a 30m (10MHz) dipole antenna and a useful oscillator/mixer IC as a crystal oscillator and mixer.
Please click on the 'continue reading' link below for complete build instructions and parts list.
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