5 hours ago
- A 3D printer's heatbed can act as an antenna, but its traces are designed for DC heating, not RF optimization.
- Using a NanoVNA, the experiment found SWR notches around 1 GHz, 130 MHz, and 43 MHz, indicating potential radio reception frequencies.
- Within a mile of a high-power FM transmitter (e.g., 30+ kW), the heatbed can pick up clear stereo FM signals.