System function RTTI splitter
WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
The antenna output is divided asymmetrically. The IBOC tuner receives a signal attenuated by 1 dB, the head unit a signal attenuated by 10 dB. The level delivered by the active FM antenna is this divided in a ratio of 9:1 (IBOC: RTTI). The antenna output is divided by the splitter with a ratio of 10:1 (IBOC: RTTI). This division of the antenna output is adequate for the CCC to receive the RTTI Data received. The antenna diversity is controlled by the IBOC control module.