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, ...

MIAMI (CBSMiami) - A massive shortwave radio antenna sits in a cow pasture north of Lake Okeechobee in Central Florida. "We have 14, 100,000-watt transmitters and 23 antennas beaming to all parts of ...

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, ...

The circuit presented here illustrates the fact that in spite of all kinds of new component and technology, it is still possible to design useful, and interesting, circuits. The circuit is based on ...

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 low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½J gang condenser VC1, which determines the carrier frequency of the transmitter in conjunction with inductor L1.