Codar CR-66 receiver, classic British set, a slice of history.

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...

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...

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....

Observations of electromagnetic (radio) signals on very low frequencies, 0 KHz - 10 KHz. Observed 10 may 2008, approx. 23.00 hour on 4,5. KHz: next to the original radio resonance of 4,5 KHz there is another resonance (spectrum on approx. 10 KHz), that comes in and fades away after 30 minutes....

Clegg 99er is a Compact top quality 6 meter transceiver made in 1961. LCF School LCFschoolThis is a tube unit and will operate on 110vac with a built in power supply or external 12 volt unit. The transmitter is crystal controlled and receiver covers the lower 2 Mhz of the 6 meter amateur...

Clegg 99er is a Compact top quality 6 meter transceiver made in 1961. LCF School LCFschoolThis is a tube unit and will operate on 110vac with a built in power supply or external 12 volt unit. The transmitter is crystal controlled and receiver covers the lower 2 Mhz of the 6 meter amateur...

KC9KEP's first stab at a crystal filer I.F. tube receiver for 80 and 40m. From the 1961 ARRL handbook. More information at: http://www.bignick.net/simple_x/simplex.htm

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...

Just some more video footage of my amateur (Ham) radio/SWL \\\"shack\\\" at my apartment in Denver, Colorado. I was demonstrating some of the features of the Ham Radio Deluxe (HRD) software program as well as the Digital Master780 software which integrates...