The ‘Retro" QRP AM Transceiver board kits

QRO/QRP

The ‘Retro-75’ 75/80 Meter AM Transceiver board kit & The ‘Retro-40’ 40 Meter AM Transceiver board kit This project is a frankly nostalgic look back at our hobby of 50 years ago. It’s now been updated using all modern components. Features: Board size 3.5” x 5.27” Tunable Receiver- 50 kHz, selectable, varicap-tuned 4 kHz receiver…

Single-Layer Helical Round Wire Coil Inductor Online Calculator

DIY

The inductor calculator presented on this page is unique in that it employs the n=0 sheath helix waveguide mode to determine the inductance of a coil, irrespective of its electrical length. This allows for more accurate inductance predictions at high frequencies. Furthermore, the calculator closely follows the National Institute of Standards and Technology (NIST) methodology…