Collaborate Disseminate
Conceptually, radar is pretty simple: send out a radio wave and time how long it takes to get back via an echo. However, in practice, there are a number of …read more Continue reading DIY 6 GHZ Pulse Compression Radar
A staple of the radio amateur’s arsenal of test equipment in previous decades was the dip meter. This was a variable frequency oscillator whose coil would be placed near the …read more Continue reading A NanoVNA as a Dip Meter
In the past few years we’ve seen the rise of low-power mesh networking devices for everything from IoT devices, weather stations, and even off-grid communications networks. These radio modules are …read more Continue reading A Long-Range Meshtastic Relay
How may radios do you own? Forget the AM/FM, GMRS/FRS radios you listen to or communicate with. We’re talking about the multiple radios and antennae in your phone, your TV, your …read more Continue reading A Practical Guide To Understanding How Radios Work
Amateur radio license exams typically have a question about the bandwidths taken up by various modulation types. The concept behind the question is pretty obvious — as guardians of the …read more Continue reading How Much Bandwidth Does CW Really Occupy?
A LoRa project has traditionally required a dedicated radio module, because it’s a commercially licenced protocol. But as the way it works has been progressively reverse engineered, it’s become ever …read more Continue reading LoRA, With No Radio
While most of us carry cell phones that have GPS and other location services, they require a significant amount of infrastructure to be useful. Drive from Washington to Alaska like …read more Continue reading Automatic Position Reporting Over HF Radio
Watch out, Baofeng; there’s a new kid on the cheap handy talkie market, and judging by this hardware and firmware upgrade to the Quansheng UV-K5, the radio’s hackability is going …read more Continue reading Open HT Surgery Gives Cheap Transceiver All-Band Capabilities
[Grug Huhler] built a simple Tayloe mixer and detector on a breadboard. He decided to extend it a bit to be a full-blown software defined radio (SDR). He then used …read more Continue reading Breadboard SDR Doesn’t Need Much
RNode is an open source, unrestricted digital radio transceiver based on — but not limited to — the Reticulum cryptographic networking stack. It is another interesting project in what we …read more Continue reading RNODE: A Portable Unrestricted Digital Radio