Broadcasting FM radio from your computer can be very simple or very expensive. We're going to show you 2 inexpensive options for transferring music from PC to FM radio.
Steps

Step 1. Determine who your target audience is
If you are in the United States, the FCC has clear rules that govern how much energy and power can be used to broadcast your message.

Step 2. If streaming to a home stereo system or to a portable sound system Boombox is what you are looking for, then buy an MP3 FM radio transmitter

Step 3. Connect the MP3-FM radio transmitter to the speaker or headphone jack on your computer

Step 4. Load the playlist into Windows Media Player or other media playback application and click the Play button

Step 5. Enjoy the tunes
Method 1 of 1: Use a PCI Card

Step 1. Purchase an FM transmitter that plugs into a PCI slot on your personal computer

Step 2. Connect the interconnect cable from the speaker / headphone out connector on the PC sound card to the audio input on the transmitter

Step 3. Download the supplied software

Step 4. Select an empty frequency to transmit

Step 5. Load your favorite playlist into your media player and click the Play button

Step 6. Enjoy tunes
Advice
- Enable the microphone for playback by unchecking the box next to the "Mute" option on the mixer on your PC sound card. This will allow you to preview songs.
- Use Skype to broadcast radio programs.
- Accept song requests via email from friends and neighbors.
Warnings
- In the United States, a license is required to officially use an FM transmitter that does not comply with certain regulations. The two methods in this article are legal. But there are more powerful transmitters on the market that are not licensed in the United States. If you do not pay attention to this point, then you can run into problems.
- See https://www.fcc.gov/mb/audio/lpfm/index.html for details on obtaining a "Low Power FM" license.