4. Why does noise occur with Avantree Roadtrip's FM transmitter?

The presence of noise when using the FM transmitter function often results from interference with local FM signals. Here’s how to ensure clearer audio transmission:

1. Finding a Vacant FM Channel:

   • The quality of your audio experience heavily relies on the clarity of the FM channel you choose. Generally, vacant FM channels are most commonly found below 90.0MHz and above 107.0MHz.
   • To locate a clean channel, turn on your car radio and scan for frequencies that only produce a constant static or buzz sound, indicating no active broadcasting.

2. Adjusting to Regional Variations:

   • Empty FM channels can vary significantly depending on your location. As you travel and cross into different regions, previously clear channels may develop interference due to local broadcasts.
   • If you start to experience poor audio quality or interference, it’s important to safely scan and switch to another vacant channel that remains free of voices or music.

3. Note on Environmental Interference:

   • Sometimes, passing through certain areas like near traffic lights may cause interference due to electromagnetic signals from these infrastructures. Be aware of changes in audio quality in such locations and be prepared to adjust the FM channel as needed.

By proactively managing and adjusting the FM transmission channel, you can significantly improve your listening experience with the Roadtrip device.