User Manual

The larger the number the higher the transmission power. For example, 96.3MHz is a higher number than the others

(FYI, its Univision 96.3 FM (https://adafru.it/dBs)!) whereas 95.1 MHz is nice as low, that's not used for any transmission.

Try to find a number that's also not surrounded by high numbers, since it can get 'drowned out' by the nearby

frequencies.

Library Reference

Radio Transmitter control

Start out by initializing the Si4713 chipset with

begin()