HF In Small Spaces
Generally, the biggest problem a new ham radio operator will come across when starting out on the high frequency (HF) bands is finding physical space for the antennas. For a …read more Continue reading HF In Small Spaces
Category Archives: loop
Simple Circuit Keeps Process Control Loops in Tune
Spare a moment’s pity for the process engineer, whose job it is to keep industrial automation running no matter what. These poor souls seem to be forever on call, fielding …read more Continue reading Simple Circuit Keeps Process Control Loops in Tune
Compose Any Song With Twelve Buttons
Limitations placed on any creative process often paradoxically create an environment in which creativity flourishes. A simple overview of modern pop, rock, or country music illustrates this principle quite readily. …read more Continue reading Compose Any Song With Twelve Buttons
He’s the Operator of His Pocket Arduino
The band Kraftwerk hit the music scene with its unique electronic sound in the 70s in Germany, opening the door for the electronic music revolution of the following decade. If you’re not familiar with the band, they often had songs with a technology theme as well, and thanks to modern …read more
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
Continue reading Homebrew Loop Antenna Brings the Shortwave World to You
Wire Loop And Amplifier Solve Audio Problem For The Hearing Impaired
Imagine being asked to provide sound reinforcement for a meeting that occurs in a large room, where anyone can be the speaker, and in a situation where microphones would hinder the flow of the meeting. Throw in a couple of attendees who have hearing disabilities, and you’ve got quite a …read more
Continue reading Wire Loop And Amplifier Solve Audio Problem For The Hearing Impaired
Reverse Engineering An Insulin Pump With An SDR And Decapping
Insulin pumps are a medical device used by people with diabetes to automatically deliver a measured dose of insulin into their bloodstream. Traditionally they have involved a canula and separate connected pump, but more recent models have taken the form of a patch with a pump mounted directly upon it. …read more
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High-Style Ball Balancing Platform
If IKEA made ball-balancing PID robots, they’d probably look like this one.
This [Johan Link] build isn’t just about style. A look under the hood reveals not the standard, off-the-shelf microcontroller development board you might expect. Instead, [Johan] designed and built his own board with an ATmega32 to run the three servos that control the platform. The entire apparatus is made from a dozen or so 3D-printed parts that interlock to form the base, the platform, and the housing for the USB webcam that’s perched on an aluminum tube. From that vantage point, the camera’s images are analyzed with OpenCV …read more
Elon Musk’s Boring Company Is Building an 18-Mile Tunnel In Chicago
The loop between downtown Chicago and O’Hare airport will be the Boring Company’s biggest project yet. Continue reading Elon Musk’s Boring Company Is Building an 18-Mile Tunnel In Chicago
[Jeri] Builds a Magnetic Loop Antenna
Most new hams quickly learn that the high-frequency bands are where the action is, and getting on the air somewhere between 40- and 160-meters is the way to make those coveted globe-hopping contacts. Trouble is, the easiest antennas to build — horizontal center-fed dipoles — start to claim a lot of real estate at these wavelengths.
So hacker of note and dedicated amateur radio operator [Jeri Ellsworth (AI6TK)] has started a video series devoted to building a magnetic loop antenna for the 160- and 80-meter bands. The first video, included after the break, is an overview of the rationale behind …read more
