Antenna: Description and Operation

91 Integrated aerial system

Aerial diversity
Like its predecessor, the 911 Carrera features aerial diversity as standard (in conjunction with PCM). The aerials are incorporated into the windscreen and ensure excellent reception.

The system switches over to another aerial if the signal for one aerial is inadequate or there is too much interference. One of the aerials is defined as the main aerial and is directly controlled. When tuned to FM (VHF), the radio supplies a so-called ZF signal to the aerial diversity control unit. The control unit determines the signal quality from this signal. In case of low signal quality, alternative aerials (3 in all) are activated in succession until the signal from one aerial is assessed as "good".

NOTE: The system is not designed to receive AM since the switchover of the aerials would result in audible interference.







Telephone aerial
The telephone aerial is designed for GSM 900/1800 MHz. It also supports the US telephone networks AMPS and PCS 1900.

The aerial is located under the cowl frame cover (front right of luggage compartment in front of the front windscreen). The aerials on RHD and LHD vehicles are identical in terms of electrics but represent mirror-images of each other in terms of their mechanical configuration. The aerial and its terminals are corrosion- and water-proof.

The terminal impedance is 50 ohm.