Antenna: Description and Operation

91 Integrated Antenna System

Antenna Diversity

NOTE: The system is not designed to receive AM since switchover between the antennas would result in audible interference







Like its predecessor, the 911 Carrera features aerial diversity as standard (in conjunction with PCM). The aerials are incorporated into the windshield and ensure excellent reception. The system switches over to another antenna if the signal for one antenna is inadequate or there is too much interference. One of the antennas 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 antenna diversity control unit. The control unit determines the signal quality from this signal. In case of low signal quality, alternative antenna (3 in all) are activated in succession until the signal from one antenna is assessed as "good".

Telephone Antenna

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

The antenna is located under the cowl frame cover (front right of luggage compartment in front of the front windshield). The antenna and its terminals are corrosion- and water-proof. The terminal impedance is 50 ohm.