The radio transmitter devices supported by the project include KT0803.
I2cConnectionSettings settings = new I2cConnectionSettings(1, Kt0803.DefaultI2cAddress);
I2cDevice device = I2cDevice.Create(settings);
// The radio is running on FM 106.6MHz
using (Kt0803 radio = new Kt0803(device, 106.6, Region.China))
{
// Connect Raspberry Pi or other sound sources to the 3.5mm earphone jack of the module
}
KT0803: https://cdn.datasheetspdf.com/pdf-down/K/T/0/KT0803L-KTMicro.pdf