Antenna system with Diversity function

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2008 Audi S4, 2008 Audi RS 4, 2008 Audi A4, 2007 Audi S4, and 2007 Audi RS 4. However, it is still accessible from the selected car via links, so may be relevant.

The "Symphony" / from MY04, "Concert" /from MY05 and "Chorus" systems have an antenna system with diversity function. This improves and optimizes reception quality.

In addition to the roof antenna and rear window antenna with amplifier, an antenna in the rear or side with an amplifier is also used.

Individual antennas with amplifier are controlled via the Antenna Selection Control Module J515 (Diversity box).

The signal going via the antenna wire (HF) from Antenna Selection Control Module J515 into the Radio R is checked and the result is output back to the Antenna Selection Control Module J515 via an additional antenna connection (IF).

If the antenna signal is too weak, the Antenna Selection Control Module J515 switches to another antenna (diversity function).

This switching process is neither seen nor heard.

The procedure is the same as "switching diversity".

With "phase diversity" , the Radio R has two internal tuners with one input each (AM/FM1, FM2).

If the signal received is interrupted, both signals are digitalized and separated in the tuners in the Radio R so that the disrupted signals are blocked out as much as possible.

If the reception signal is not disrupted, the Radio R constantly compares which antenna (amplifier) has the strongest reception. This is then transferred

In this case, the second tuner checks the frequency band in the background for better reception frequencies for the selected station. If a better signal is found, this tuner switches to reception and the other to the background.