Jim Matthews has introduced an innovative Ham Radio foxhunt transmitter for the 2025 One Hertz Challenge. This project showcases a creative approach to building a radio beacon specifically designed for use in fox hunting, a popular activity among radio enthusiasts.
The transmitter combines a SR-T300 walkie-talkie module with a phototransistor and an oscillating LED circuit. By securing these components face-to-face inside heat shrink tubing, Matthews effectively isolates them from ambient light, ensuring optimal performance during the hunt. When the LED flashes, it activates the phototransistor, which in turn powers the radio, transmitting a tone within the UHF band.
Understanding the Fox Hunt
A fox hunt is a competitive game where participants use radio signals to locate a hidden beacon. In this context, Matthews’ circuit serves as the beacon, enhancing the excitement and challenge of the hunt. Powered by a three-volt CR2032 battery, the transmitter emits a strong signal that can reach several hundred yards, specifically at a frequency of 433.5 MHz, which falls within the amateur radio UHF band.
This clever design not only highlights Matthews’ engineering skills but also contributes to the broader ham radio community, where such beacons are essential for challenges and competitions. For those interested in similar technology, exploring the WSPR beacon could provide additional insights into radio beacons and their functionalities.
Matthews’ project exemplifies the spirit of innovation and creativity that the One Hertz Challenge aims to promote, encouraging participants to develop practical solutions that engage and inspire others in the field of amateur radio. As the competition approaches, this transmitter is set to make an impact, showcasing the ingenuity that defines the ham radio community.
