Ampegon says it is about to deliver and install its first rotatable shortwave high-power array antenna on the North American continent. The system, which will be installed WBCQ in the United States, ...

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, ...

As a broadcast engineer and shortwave listener, I enjoy not only the efficiency of a shortwave signal propagating through the ionosphere and reaching more the earth than any other broadcast signal, ...

This is a wide band shortwave SW antenna amplifier. The frequency band is 1 to 30 MHz and a medium gain of 15 dB. The input stage is built with MPF102 and the other stages with 2N3904. The power ...

A true monster of a shortwave antenna has been standing near Moosbrunn south of Vienna since 1983. The curtain antenna weighs 320 tons, produces up to 500 kilowatts and has two towers, each 76 meters ...

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 ...

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 ...