Amateur Radio

The local 200 kW, 612 kHz AM broadcast station, located 20 km away as the crow flies, is quite readable on this simple crystal radio employi...

A heavy 2 m x 2 m floor-standing wooden showcase in the shack appeared to be suitable as a frame for a crystal radio loop antenna.  As luck ...

Here are the schematics of two parallel-tuned versions of my  'Compact Loudspeaker Crystal Radio' . Parallel - tuned Compact Lou...

A fully tarnished, shiny black silver artefact was tried out as a detector in place of the germanium transistor in my series-tuned, shunt-fe...

A vintage telephone carbon microphone, which possesses multiple contacts between carbon granules and metal, was tried out as a detector, r...

A vintage unmarked inductor/transformer had been lying neglected in my junkbox for decades and I had to resurrect it. Resistance checks sh...

After several failed attempts to build an FM Crystal Radio with a diode detector, a dual-gate mosfet version was tried out but also in vai...

The problem with my ' Portable AM Crystal Radio ' is that it works well only when close to an overhead CATV cable working as a passi...