US Edition2025 One Hertz Challenge: Ham Radio Foxhunt Transmitter
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2025 One Hertz Challenge: Ham Radio Foxhunt Transmitter
submitted their Ham Radio foxhunt transmitter project for the 2025 One Hertz Challenge. This is a clever Spartan build. In order to create a radio beacon for use in a “fox hunt” [Jim] combined a SR-T300 walkie talkie module with a phototransistor and oscillating LED circuit. The phototransistor and oscillating LED are secured face-to-face inside heat shrink tubing which isolates them from ambient light. When the LED flashes on the phototransisto…
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