PicoFox - Open Source Fox Transmitter

More power, adjustable output, USB-C charging, and much more.

Out of the box PicoFox is a great little fox transmitter for the 2-meter amateur band but what it becomes is up to you. With open-source hardware and software built around the RP2040 microcontroller (the same chip used in the Raspberry Pi Pico) the PicoFox can be anything you'd like it to be. There's ample CPU, flash, and GPIO available if you want to add features like sensors or interactivity. The transmitter can generate a frequency or phase modulated signal with up to 2.5kHz (data) bandwidth so APRS and most other digital modes are well within the range of possibilities.

Ships fully assembled in a beautiful injection molded enclosure. Includes a rechargeable battery and antenna. Source materials available on my GitHub.

Key Features:

• Transmits FM in the 144–148 MHz band (ITU Zone 1: 144–146 MHz).
• Configured by editing a text file — no software or terminal needed.
• Transmits any 5kHz 16-bit PCM WAV file. (Example file provided, of course.)
• Automatic Morse code ID with configurable tone, speed, and spacing.
• RF output up to 65mW (18dBm). Adjustable down to 0.1mW (-10dBm).
• Charges over USB.
• Complete and fully assembled, including enclosure, rechargeable battery, antenna.
• Expansion header provides:
  • 9 GPIOs (including I2C, SPI, UART, ADC).
  • Regulated 3.3V and raw battery voltage.
  • Two additional SI5351 clock outputs.
• Upgrade footprint on back (secret projects in the works).