Narrow-band VLF transmitter waves originate from the powerful ground-based VLF transmitters for submarine communications, which are typically over the frequency range of 10–30 kHz. VLF transmitter ...

If you need to generate a radio frequency electrical signal, you will make some form of electronic oscillator. We’ll probably all be used to oscillators using transistors, tubes, logic gates or a host ...

Is your ham radio rig made of iron and steel? Is it mechanically driven? Classified as a World Heritage Site? We didn’t think so. But if you’d like to tune in one that is, or if you’re just a ham ...

U.S. Air Force Staff Sgt. Corey Johnson, Tactical Air Control Party member, communicates with French air force aviators during a tactical exercise Feb. 24, 2016, in Djibouti. Although aviators across ...

DARPA interested looking to eliminate that issue and develop physical structures 1000 times smaller that could handle new long-distance communication applications. At these frequencies, free‐space ...

While everyone is focused on RF signals in the gigahertz-plus range, it’s important to remember that the other end of the electromagnetic spectrum also has its uses. However, signals in ...

A new type of pocket-sized antenna could enable mobile communication in situations where conventional radios don't work, such as underwater, through the ground and over very long distances through air ...