Category Archives: radio hacks

3D Printing An Old-School Coherer

Coherers were devices used in some of the very earliest radio experiments in the 19th century. Consisting of a tube filled with metal filings with an electrode at each end, the coherer would begin to conduct when in the presence of radio frequency energy. Physically tapping the device would then …read more

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Posted in 3d Printer hacks, coherer, radio, radio hacks, spark gap | Leave a comment

The Power Of Directional Antennas

AM broadcasting had a big problem, but usually only at night. During the day the AM signals had limited range, but at night they could travel across the country. With simple wire antennas, any two stations on the same frequency would interfere with each other. Because of this, the FCC …read more

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Posted in am radio, antenna, antennas, directional antennas, history, radio hacks | Leave a comment

The Backbone Of VHF Amateur Radio May Be Under Threat

A story that has been on the burner for a few weeks concerns a proposal that will be advanced to the ITU World Radiocommunication Conference 2023. It originates with French spectrum regulators and is reported to be at the behest of the Paris-based multinational defence contractor Thales. The sting in …read more

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Posted in 2 metres, amateur radio, news, radio, radio hacks | Leave a comment

The Comforting Blue Glow Of Old Time Radio

When you think of an old radio it’s possible you imagine a wooden-cased tube radio receiver as clustered around by a 1940s family anxious for news from the front, or maybe even a hefty 19-inch rack casing for a “boat anchor” ham radio transmitter. But neither of those are really …read more

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Posted in Marconi, radio hacks, spark gap, spark gap transmitter | Leave a comment

An SDR Transceiver The Old-School Way

Software-defined radios or SDRs have provided a step-change in the way we use radio. From your FM broadcast receiver which very likely now has single-application SDR technology embedded in a chip through to the all-singing-all-dancing general purpose SDR you’d find on an experimenter’s bench, control over signal processing has moved …read more

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Posted in amateur radio, ham radio, quadrature, radio, radio hacks, sdr, transceiver | Leave a comment

A Work of Art That Also Receives AM and SSB

Over the winter, [Michael LeBlanc] thought a good way to spend his time during those long dark nights would be to scratch build his own direct conversion receiver. He was able to find plans for such a project easily enough online, but where’s the fun in following instructions? The final …read more

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Posted in 3D printed enclosure, amateur radio, Arduino Hacks, direct conversion receiver, radio hacks, tda2003a | Leave a comment

A Two Metre Bridge Across The Atlantic For The First Time

Amateur radio is a pursuit with many facets, some of which hold more attention than others for the hacker. Though there have been radio amateurs for a century it still has boundaries that are being tested, and sometimes they come in surprising places.

A recent first involved something you might …read more

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Posted in 144 MHz, 2m, FT8, radio, radio hacks | Leave a comment

Hams Gone Wild: Amateur Radio Field Day 2019

Of all the images that amateur radio conjures up, the great outdoors doesn’t usually figure heavily. People seem to think hams sit in a dark room at a desk heavy with radio gear, banging out Morse code into late into the night and heedless of the world outside the window. …read more

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Posted in amateur radio ARRL, APRS, contest, DX, field day, FT8, GOTA, ham radio, HF, radio hacks, uhf, VHF | Leave a comment

A DIY Step Attenuator, By Gluing Together Two Smaller Ones

In the RF world, attenuators are a useful test and measurement tool. Variable units that can apply different levels of attenuation in discrete steps are even better. [DuWayne] made a 63 dB step attenuator by putting two smaller units in series, with an Arduino Nano in control of them. With …read more

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Posted in 3d printed, attenuator, PE4302, radio hacks, RF, step attenuator | Leave a comment

Your Table Is Ready, Courtesy Of HackRF

Have you ever found yourself in a crowded restaurant on a Saturday night, holding onto one of those little gadgets that blinks and vibrates when it’s your turn to be seated? Next time, bust out the HackRF and follow along with [Tony Tiger] as he shows how it can be …read more

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Posted in gnu radio, HackRF, inspectrum, pager, radio hacks, reverse engineering, Universal Radio Hacker, wireless hacks | Leave a comment