BMW E90 Manual page 19

Diversity Module Internal Schematic
Index
Rear-window aerials FM1, FM2,
1
2
3
Band-pass filter for AM signal
Aerial changeover switch for FM
4
5
6
Band-pass filter for FM signal
KL
Control signal or switched
voltage supply from radio
Rad_on
Antenna diversity changeover
Us
Explanation
FM3 and AM
AM aerial amplifier
aerials
FM aerial amplifier
voltage from radio
Index Explanation
7
Band-block filter for IF signal
8
Coaxial line to radio
9
10
Diversity electronics
11
Band-pass filter for IF signal
Demodulator with signal evaluation
12
based on level and noise component
HF
RF signal to radio
ZF
IF signal from radio
DC filter
19
E90 Communication