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...

Best viewed in high quality. Burt, K1OIK reviews the Flex 5000A Software Defined amateur radio.

This is a one valve [tube] radio that believe it or not I constructed 48 years ago. It remained lost but was discovered again during a recent house move. The valve used is a battery R.F. pentode dating from around 1948 on a B7G base. The type number is DF91 or the American equivalent, the 1T4....

VHF SSB Weak Signal Highlight Video

If you’ve ever wondered what a Hamfest is, then this episode is for you. We visit Jackson Amateur Radio Club’s ‘2006 Capital City Hamfest’. We’ve got an ARRL net being called, highlights from the Skywarn Forum, ARRL Katrina Review, an amateur radio Satellite Demonstration and lots...

On Saturday, April 21, 2007, The University of Tennessee Amateur Radio Club (UTARC) flew an experimental weather balloon to test an APRS transmitter and on-board video. The following is a 10 minute highlight video of the flight from pre-launch, to launch, ascent, cutdown, descent, landing, and...

Many mobile antenna installers fail to follow simple rules in their installation. This often results in a setup that has high losses or poor radiation patterns. High losses rob you of your output power. !! This is a VERY simplified video covering a complex subject.

The 211 Transmitting Tube is a high-power vacuum tube. Because of the power this tube requires general tube testers are not able t The 211 Transmitting Tube is a high-power vacuum tube. Because of the power this tube requires general tube testers are not able to interrogate this tube. I have...

Clip of 80m high rotaiting antena on the train platform. HF large antena for broadcast Radio station from 3Mhz to 30Mhz installation on the train platforn to rotating antenna pattern. Very impressive.

This little four-valve radio has not yet been identified. I'm hoping that somebody can identify it for me or help me to do so. It measures 6"deep, 7 high and 10 wide. The only labels it has on the front is the company name of 'Freed Eisemann' and on the rear of the internal metal chassis is a...