Schematic of the 4 tube radio, experimentally built in a way of the radio-pioneers (1910-1945). The radio acts as a cascade type receiver when the antenna coil has a high self-inductance, with lower self-inductances of the antenna coil you can put in a mixing process with the oscillator. Perhaps...

Since 1923, NIST radio station WWV has provided round-the-clock shortwave broadcasts of time and frequency signals. WWV\'s audio signal is also offered by telephone: dial (303) 499-7111 (not toll-free). A sister station, WWVH, was established in 1948 in Hawaii, and its signal can be heard by...

Radio hobbyists rescue a retired broadcast transmitter to restore and retune for vintage storytelling on shortwave. More at amfone.net

This is a demo video clip I made of receiving amateur radio PSK 31 transmissions on the amateur radio 40 meter band on 7.035 Mhz using a free software package called "Ham Radio Deluxe". I down loaded the software from http://www.ham-radio-deluxe.com. In this demo, I fed the receiver...