The widespread use of radio by the general public began in the early 1920s. In 1921 there were only around five radio stations broadcasting on a regular basis. In just two years there were hundreds of ...

What does more “juice” mean for agencies? IPT Lithium Polymer Lifesaver Series batteries cover shift after shift without fail. Now, Impact Power Technologies has engineered a new battery that delivers ...

With an aluminium-and-rubber roll cage, 360-degree stereo sound, and large buttons and knobs that are easy to manipulate when ...

Eight police departments and six university campuses are among those who have discovered a new power technology that maximizes their land mobile radio performance. In most incidents, this story began ...

This little radio packs a punch, with two solar panels, hand-crank charging, and a mini power station to charge your phone.

I’m sure many readers have built “crystal radios” that were able to provide audio from local AM radio stations to sensitive earphones using only the RF power from the radio station–no batteries are ...

MATT REYNOLDS, an assistant professor in the electrical and computer engineering department at Duke University, wears other hats, too including that of co-founder of two companies. These days, his ...