Coax Stub Filters Demystified
Unless you hold a First Degree RF Wizard rating, chances are good that coax stubs seem a bit baffling to you. They look for all the world like short circuits …read more Continue reading Coax Stub Filters Demystified
Category Archives: coaxial
Bring Out the Fine Detail in Small Objects with This Coaxial Lighting Rig
All things considered, modern photography is pretty easy. It’s really just a matter of pointing the camera at the thing you want to take a picture of and letting the …read more Continue reading Bring Out the Fine Detail in Small Objects with This Coaxial Lighting Rig
MoCA Networking Is A Niche Solution For Coax Lovers
When it comes to networking these days, the vast majority of our devices are connected wirelessly. Beyond that, we’re all familiar with the Cat 5 and Cat 6 cables that …read more Continue reading MoCA Networking Is A Niche Solution For Coax Lovers
Gimballed Omnirotor Goes Over Great Obstacles
What can drive on the ground, hop in the air, and continuously move its coaxial rotor assembly without ever having to reset its position? The answer is [New Dexterity]’s Omnirotor …read more Continue reading Gimballed Omnirotor Goes Over Great Obstacles
Coaxcopter to Carry Man
One of the major perks of all the affordable flight controllers and motors available from the hobby market is that you can really experiment with some crazy aircraft designs. [amazingdiyprojects] …read more Continue reading Coaxcopter to Carry Man
Homebrew Loop Antenna Brings the Shortwave World to You
Radio may be dead in terms of delivering entertainment, but it’s times like these when the original social network comes into its own. Being able to tune in stations from across the planet to get fresh perspectives on a global event can even be a life saver. You’ll need a …read more
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Remote ADS-B Install Listens in on All the Aircraft Transmissions with RTL-SDR Trio, Phones Home on Cellular
When installing almost any kind of radio gear, the three factors that matter most are the same as in real estate: location, location, location. An unobstructed location at the highest possible elevation gives the antenna the furthest radio horizon as well as the biggest bang for the installation buck. But …read more
Reaction Wheels Almost Control This Unusual Drone
When you think about all the forces that have to be balanced to keep a drone stable, it’s a wonder that the contraptions stay in the air at all. And when the only option for producing those forces is blowing around more or less air it’s natural to start looking for other, perhaps better ways to achieve flight control.
Taking a cue from the spacecraft industry, [Tom Stanton] decided to explore reaction wheels for controlling drones. The idea is simple – put a pair of relatively massive motorized wheels at right angles to each other on a drone, and use …read more
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The BNC Connector and How It Got That Way
When I started working in a video production house in the early 1980s, it quickly became apparent that there was a lot of snobbery in terms of equipment. These were the days when the home video market was taking off; the Format War had been fought and won by VHS, and consumer-grade VCRs were flying off the shelves and into living rooms. Most of that gear was cheap stuff, built to a price point and destined to fail sooner rather than later, like most consumer gear. In our shop, surrounded by our Ikegami cameras and Sony 3/4″ tape decks, we …read more
Fail of the Week: Two Rotors Are Not Better Than Four
Fair warning: [Paweł Spychalski]’s video is mostly him talking about how bad his “dualcopter” ended up. There are a few sequences of the ill-fated UAV undergoing flight tests, most of which seem to end with it doing a reasonable impression of a post-hole auger. We have to admit that it’s a pretty poor drone. But one can only truly fail if one fails to have some fun doing it, [Paweł] enjoyed considerable success, at least judging by the glee with which he repeatedly cratered the craft.
The overall idea seems to make sense, with coaxial props mounted in the middle …read more
Continue reading Fail of the Week: Two Rotors Are Not Better Than Four