Raspberry 4 not working

[Kisiekx]

Hello, I made everything like you said. I installed it and then I put this commands: make GPIO21=1 echo "performance"| sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor then I played example audio: sudo ./fm_transmitter -f 92.0 acoustic_guitar_duet.wav and it says that it is broadcasting but it's not. I'm using RPi4b 8gb ram and i read this: https://github.com/markondej/fm_transmitter/issues/102 but nothing did work. Do you have any idea why it is not working?

[CatalinPuscoci]

Try lower frequencies, and I strongly suggest attaching a wire to act as an antenna to that gpio pin if you want to hear it properly. I found myself sticking to 50MHz more often than not.

More details about your setup would be nice too.

[Kisiekx]

I'm using raspberry pi 8gb ram and raspbian. Actually i found out that although i used: make GPIO21=1 not GPIO21 was transmitting but GPIO4. I plugged wire to GPIO4 and it was working but very bad. I tried plugging wire to GPIO21 but nothing was happening.

[TheLiuzhu]

When I first install the code, it don't works at all either. However, after one day(tmr morning), it works PS: This is real ,I am NOT kidding, so maybe wait will help (at least on my RPi4B 4G).