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

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, etc.) 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.

Demodulation of RCL signals 

The signals for the radio-controlled central locking are demodulated and digitized by the left 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 effective signal (e.g. RCL signal) is separated from the high frequency carrier frequency (transmission frequency).

Equipment 

The left antenna amplifier module (A2/64) is the receiver for AM/FM and RRCL (radio remote central locking). 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 components for each system are diagonally installed.