Retrofitting Mobile Communication Systems
In general, it is necessary to get approval for the installation of mobile communication systems (car telephone, mobile phone, two-way radios, etc.) in a vehicle that received its type approval after 1st January, 1996.
Mobile two-way radios (telephones) that are retrofitted must have a type approval for this vehicle and be identified with an e.
In the Driver's Manual of its vehicles Porsche has approved mobile telephones and two-way radios with a maximum transmission power of 10 W. Observe the installation specifications and recommendations listed there.
Porsche permits the installation and operation of two-way radios over 10 W for the radio services listed below under the following preconditions:
- The transmission powers in the given frequency range may not exceed the respective Pmax values at the antenna base.
- The installation must be carried out correctly and a non-reflecting adapted external antenna must be used.
- Always observe the operating and installation instructions of the manufacturer for mobile phones, two-way radios and antenna.
- When mobile phones and two-way radios are correctly installed, they are not influenced by important vehicle systems such as ABS, airbag and Motronic. The requirement is, however, that the installation and wiring of these systems is not altered. A wiring arrangement parallel to these systems and their wiring harnesses (especially sensor wires) is not permitted.
| Frequency band | Pmax/Watt Cabrio | Pmax/WCoupe hardtop | Permitted location of antenna |
|---|---|---|---|
| Short wave up to 54 MHz | 10 (PEP) | 50 (PEP) | on vehicle outside |
| Frequency band | Pmax/Watt Cabrio | Pmax/WCoupe hardtop | Permitted location of antenna |
|---|---|---|---|
| 4m band | 10 (eff.) | 20 (eff.) | on vehicle outside |
| 2m band | 10 (eff.) | 50 (eff.) | on vehicle outside |
| 70cm | 10 (eff.) | 50 (eff.) | on vehicle outside |
| 23cm | 10 (eff.) | 20 (eff.) | on vehicle outside |
| C-net | 10 (eff.) | 25 (eff.) | on vehicle outside |
| D-net | 10 (PEP) | 20 (PEP) | on vehicle outside |
| E-net | 10 (PEP) | 10 (PEP) | on vehicle outside |
If a mobile phone or two-way radio is installed which does not conform to Porsche installation conditions, the general certification of the vehicle can be rendered null and void (EU EMV Vehicle regulation 95/54). In this case it is necessary to have EMV experts inspect the Porsche in order to observe the protective goals.
The optimum range of the two-way radios can only be reached with an external antenna. Excessive electro-magnetic fields can occur in the vehicle from the operation of mobile phones and two-way radios without an external antenna or with an external antenna that is incorrectly installed (or defective). In this case, malfunctions of the electronic vehicle systems and damage to health cannot be entirely ruled out.
In general, a suitably chosen antenna location and a reduction of transmission power if necessary ensure adherence to the limit values of the DIN VDE 0848 Part 2 (Protection of persons in a frequency range of 30 kHz to 300 Ghz).