Measuring the performance of antennas in absolute terms that can involve a lot of expensive equipment and specialized facilities. For practical applications, especially when building antennas, ...

The National Institute of Information and Communications Technology (NICT, President: TOKUDA Hideyuki, Ph.D.), in collaboration with Electronic Navigation Research Institute, National Institute of ...

Building antennas is a time-honored ham radio tradition. Shortwave antennas tend to be bulky but at VHF frequencies the antenna sizes are pretty manageable. [Fjkaan’s] 2 meter quadrifilar helicoidal ...

Radio World toured VOA’s Greenville, N.C., facility recently. Photos from our visit are shown here. Few would dispute that there has been a marked decline in shortwave broadcasting listenership since ...

This simple little circuit can be used for AM, FM, and Shortwave(SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. It is further more designed to be used on ...

An industry expert offers some suggestions for dealing with the challenges of testing today's high-frequency antennas. A common solution to EMC/EMI test requirements is the rectangular anechoic ...

Vatican Radio agreed Wednesday to reduce some shortwave transmissions to comply with tough Italian environmental regulations. Negotiations on medium-wave broadcasts are continuing. The station is ...

Shortwave is where radio communication began. Once a powerful voice to tell the story of South Africa to the world, this voice has gone silent as Sentech closed down its shortwave broadcasting ...