Audi TT Roadster, Service Training

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Infotainment
Legend:
J393 Convenience system central control unit
J503 Control unit with display for radio and
navigation
R24 Aerial amplifier
R50 Navigation aerial
R65 Telephone aerial
R86 Aerial amplifier, mobile telephone
R93 Radio aerial 2
R111 Aerial amplifier -2-
R126 Telephone bracket
The BNS 5.0 and RNS-E radio navigation systems
have FM tuners with switched diversity.
In these radios, aerial switching takes place in an
external aerial amplifier with aerial selection.
The radio has an aerial input (HF signal) and a signal
output (IF signal).
The IF signal is evaluated by an aerial amplifier.
If the signal is too weak, this aerial amplifier
switches to the other aerial. In vehicles equipped with a radio navigation system
without TV tuner, the serial selection function is
integrated in aerial amplifier -2- R111.
Aerial amplifier -2- R111 receives signals from both
radio aerials and can switch between both aerials
when FM reception is desired. When AM reception
is desired, aerial amplifier -2- R111 is always
switched to the stub aerial.
Aerial system for radio navigation systems (without TV tuner)