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# FM Transmitter
Use the Raspberry Pi as an FM transmitter. Works on every Raspberry Pi board.
Use the Raspberry Pi as an FM transmitter. Works on Raspberry Pi board up to 4 (RPi 5 uses different peripherial chip).
Just get an FM receiver, connect a 20 - 40 cm plain wire to the Raspberry Pi's GPIO4 (PIN 7 on GPIO header) to act as an antenna, and you are ready for broadcasting.
@ -33,7 +33,7 @@ Other options:
* -b bandwidth - Specifies the bandwidth in kHz, 100 by default
* -r - Loops the playback
After transmission has begun, simply tune an FM receiver to chosen frequency, you should hear the playback.
After transmission has begun, simply tune an FM receiver to the chosen frequency, and you should hear the playback.
### Raspberry Pi 4
On Raspberry Pi 4 other built-in hardware probably interfers somehow with this software making transmitting not possible on all standard FM broadcasting frequencies. In this case it is recommended to:
1. Compile executable with option to use GPIO21 instead of GPIO4 (PIN 40 on GPIO header):