A tour at TenTec

Amateur radio emergency communications Farrisløpet 2008 NRRL, portable operations ...

Amateur Radio Emergency Preparedness Demonstration January 2008 assisting Red Cross and Jefferson Co DES/WMD. HF station setup in less than 10 minutes. Capabilities included HF, VHF, satellite and digital modes, completely self contained and off the grid ...

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...

The X-Band microwave motion detector was moved to 10.25GHz. We explore the output of the HP x421A detector diode attached to the HP x532A X-Band wavemeter, and verify the frequency of operation.