YAFB is an amateur radio fox transmitter designed for an ESP32-S2-Saola-1 and a NiceRF SA818.
Still being worked on and now works fairly well on my bench. Hasn't been tested yet in the field. As of Nov 2023 just sent in to have v4.1 of the board to be made. More updates soon.
My goal is to provide a way to make a cheap alternative fox transmitter. When done you'll be provided with all the files needed to make your own.
1W VHF or UHF transmitter (NiceRF SA818). Configure it over Bluetooth.
This is a CircuitPython port of the fox code from rot13labs.
The rot13labs 2023 Fox Hunt Badge used the SA868 modem to transmit. The model is also capable of receiving (but that capability is not used). The SA868 is a 2W UHF transceiver that operates in the 2 meter and 440 MHz bands. The code uses the low power output configuration: 45 mA and 25dBm. Communications between the Seeed ESP32C3 and the SA868 are doe via UART at 9600 baud.
Basically, you're the fox. You're the transmitter that folks are trying to DF. Make sure you have something awesome for them to find.
How to turn an ordinary retractable measuring tape into a directional VHF antenna (tm). Good for direction finding.