|This article does not cite any references or sources. (December 2009)|
Alternative frequency (or AF) is an option that allows a receiver to re-tune to a different frequency that provides the same station, when the first signal becomes too weak (e.g. when moving out of range). This is often used in car stereo systems, enabled by Radio Data System (RDS), or the U.S.-based Radio Broadcast Data System (RBDS).
|This article related to radio communications is a stub. You can help Wikipedia by expanding it.|