Home-Built Radio Rules

The FCC's treatment of home-built devices could stand an update

3 min read

As a youngster, I loved reading about home-brewed electronic projects. One, I recall distinctly, was ”a tuna-can radio,” a low-power transmitter that could be put in a package no bigger than 5 ounces of albacore.

I thought about that circuit again decades later when I came across something called a cantenna. Another mashup of radio and recycling, this homemade Wi-Fi antenna can supposedly boost your wireless range. A little research revealed other antenna configurations that promised even better results, including those of the FabFi collaboration in Afghanistan, which uses ”common building materials and off-the-shelf electronics to transmit wireless Ethernet signals across distances of up to several miles,” according to the Jalalabad FabLab’s Web site.

Keep Reading ↓Show less

This article is for IEEE members only. Join IEEE to access our full archive.

Join the world’s largest professional organization devoted to engineering and applied sciences and get access to all of Spectrum’s articles, podcasts, and special reports. Learn more →

If you're already an IEEE member, please sign in to continue reading.

Membership includes:

  • Get unlimited access to IEEE Spectrum content
  • Follow your favorite topics to create a personalized feed of IEEE Spectrum content
  • Save Spectrum articles to read later
  • Network with other technology professionals
  • Establish a professional profile
  • Create a group to share and collaborate on projects
  • Discover IEEE events and activities
  • Join and participate in discussions

From WinZips to Cat GIFs, Jacob Ziv’s Algorithms Have Powered Decades of Compression

The lossless-compression pioneer received the 2021 IEEE Medal of Honor

11 min read
Photo of Jacob Ziv
Photo: Rami Shlush

Lossless data compression seems a bit like a magic trick. Its cousin, lossy compression, is easier to comprehend. Lossy algorithms are used to get music into the popular MP3 format and turn a digital image into a standard JPEG file. They do this by selectively removing bits, taking what scientists know about the way we see and hear to determine which bits we'd least miss. But no one can make the case that the resulting file is a perfect replica of the original.

Not so with lossless data compression. Bits do disappear, making the data file dramatically smaller and thus easier to store and transmit. The important difference is that the bits reappear on command. It's as if the bits are rabbits in a magician's act, disappearing and then reappearing from inside a hat at the wave of a wand.

Keep Reading ↓Show less