Day for the radio amateur

What is Hellschreiber. Hellschreiber is a German name, meaning "bright writing", or "clear writing". Hellschreiber is anything but a new mode. It was first patented in 1929 which makes it the oldest machine generated data transmission mode used in amateur radio. To put this in perspective, SSB...

Terry, W0VB, describes his rural station for working EME, aurora and meteor weak signals on 2 meters using a Software Defined Radio (SDR) Flex Radio Systems SDR-1000. The video contains an aurora contact with VE3AK and also a tour of Terry's six Yagi array.

Terry, W0VB, describes his rural station for working EME, aurora and meteor weak signals on 2 meters using a Software Defined Radio (SDR) Flex Radio Systems SDR-1000. The video contains an aurora contact with VE3AK and also a tour of Terry's six Yagi array.

During the European Triode Festival 2006 (ETF06) the 100th anniversary of the Triode was celebrated. To honor this Triode Centennial, a copy of the DeForest Audion (the first triode) was made. This video documents the making of the ETF06 Triode.

Special event station from Fort McCalister Georgia working 20 mtrs on 3 Jan 09

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...

Sample of 20 Meter Activity for PSK31 Introduction Video

The Fresno Amateur Radio Club 2008 Field Day held at Pineridge School in Pineridge California, elevation 4843 feet. This is the raising of a portable 75 foot tower.

Experimental receiver for VLF. I received electromagnetic (radio) signals between 14 and 22 KHz with a capacitor of 4,7 NF over the showed coil. The schematic is identical to that of the storm detector IV (with the 6088 Tube), the coil is differently constructed. There is one more transistor...