Pvt. Grant Aubuchon reports to his squad leader using a high-frequency Manpack radio as his squad prepares for an ambush during Iron Focus 18.1 field training exercise March 20, 2018. (Sgt. John ...

This article is intended to introduce the beginner to the interesting and challenging art of high frequency radio design. It is also intended to entice the seasoned professional to take a deeper look ...

The Department of Veterans Affairs plans to build a nationwide high-frequency radio network to connect its medical facilities in case of an emergency that knocks out other forms of communications -- ...

Ham radio operators are sounding the alarm over the latest threat to their beloved hobby—and this time, it is coming from Wall Street. A group of high-frequency trading firms is asking the Federal ...

FORT HUACHUCA, Ariz. - The U.S. Army's battlespace has long benefited from the use of wireless communications for over 100 years. In fact, it was here in the Southwestern states of Arizona, New Mexico ...

As discussed in Part 1 of this series, as the frequency of a single or coupled tuned circuits is increased, the selectivity decreases to the point that there may be insufficient selectivity at the ...

Ham radio operators have been using the shortwave (“high-frequency” or HF) bands for data communications for over 50 years, but the data rates are much less than those available with dial-up modems.

Recent changes in licensing rules that will no longer require knowing Morse Code will open long-distance ham-radio frequencies to more people by the end of this month, they said. The code requirement ...

Frequency selective levelmeters, also known as frequency selective voltmeters, are commercially-built receivers used in the power utility industry for maintenance and troubleshooting. They have been ...

Two years ago, in my home state of Kentucky, we had a devastating tornado that traveled nearly 200 miles, leveled towns, killed scores of people, and left widespread devastation. When emergency ...