Antenna amplifier module, function - GF82.62-P-3105-04TU

Filtering and amplifying radio frequency signals 

The electrical filters of the left antenna amplifier module (A2/64) and the right antenna amplifier module (A2/65) select the required frequency bands (AM, FM, TV) from the high-frequency signals received by the rear window antennas.

These filters are configured differently depending on the country (e.g. , ), because the transmitting frequencies are country-specific.

The filtered frequency ranges are then selectively amplified and forwarded over data lines to the corresponding control units, e.g.:

• Audio gateway control unit (N93/1)
• Rear SAM control unit with fuse and relay module (N10/2)

Demodulation of RCL signals 

The signals for the radio remote control central locking (CL) are demodulated and digitized by the left antenna amplifier module (A2/64).

The data prepared in this manner are sent over a separate data line to the rear SAM control unit with fuse and relay module (N10/2) and forwarded to the CAN interior (CAN-B).

During demodulation, the useful signal (e.g. RRCL signal) is separated from the high frequency carrier frequency (transmission frequency).

Equipment for model 211.0 

The functionality of the left antenna amplifier module (A2/64) corresponds to the three equipment variants for radio operation:

• With code (528) HIGH Class USA with AM/FM amplifier with antenna diversity and RRCL receiver as well as 2 TV amplifiers

The right antenna amplifier module (A2/65) with additional TV amplifiers is also required for TV operation. This module also contains the Keyless Go receiver.

With code (528) HIGH Class USA the right antenna amplifier module (A2/65) is purely a passive Keyless Go module because TV reception is no longer applicable.

Equipment for model 211.2 

The left antenna amplifier module (A2/64) is the receiver for AM/FM and radio remote central locking (RRCL). In vehicles with FM diversity the AM amplifier with diversity unit and the radio remote central locking receiver are installed in the same housing. The module is supplemented with a separate 2x-FM-amplifier, amplifier module 1 and the window antenna (A2/71).

Television reception occurs via the right antenna amplifier module (A2/65) in combination with the amplifier module 2, window antenna (A2/72).

To prevent any interference to the radio and TV frequency ranges, the antenna amplifier modules for each system are diagonally installed.