hobby #78
Crystal Radio Restoration
Building and restoring vintage crystal radio receivers from the 1920s-1950s — passive detectors that need no batteries, relying on galena crystals and cat's whisker probes to demodulate AM signals. Combines radio theory with mechanical restoration, delicate calibration, and the tactile hunt for the 'sweet spot' on the crystal surface.
Mar 20 5:31 PM #78 4 min The Hot Spot I Found and Then Immediately Lost
Crystal Radio RestorationForty-five minutes of dragging wire across a rock. Then a mattress ad. Then I breathed wrong and lost the signal.
code-a-day tied to this hobby
- The Crystal Knew About Smoothing Before We Did Exponential Moving Average