MOBILE AND TRANSPORTABLE PHONES To be able to place and receive telephone calls for various wireless applications — a telephone for the construction site, or on a boat, for example — you may want to consider a transportable phone. Vehicleinstalled phones used to be the primary type of cellular phone, and are still important for many users. CAR CELLULAR TELEPHONE COMPONENTS A typical cellular phone installation for an automobile consists of four basic components: the power source, the control head, the transceiver/logic unit, and the antenna (see Figure ). Most problems with installed car phones are a result of poor or improper. | The Cellular Connection A Guide to Cellular Telephones Fourth Edition. Robert A. Steuernagel Copyright 2000 John Wiley Sons Inc. ISBNs 0-471-31652-0 Paper 0-471-20340-8 Electronic 8 MOBILE AND TRANSPORTABLE PHONES To be able to place and receive telephone calls for various wireless applications a telephone for the construction site or on a boat for example you may want to consider a transportable phone. Vehicle-installed phones used to be the primary type of cellular phone and are still important for many users. CAR CELLULAR TELEPHONE COMPONENTS A typical cellular phone installation for an automobile consists of four basic components the power source the control head the transceiver logic unit and the antenna see Figure . Most problems with installed car phones are a result of poor or improper installation resulting from the need to connect several components on many different vehicle models. These components are incorporated into a single unit in the transportable and portable cellphone but should be considered logical parts of any cellular phone. Many vehicle-installed phones have some of these components incorporated into a single multi-functional component. Power Source In most cellular phone installations the phone receives its power from an automobile battery. If it is part of a permanent installation the 75 76 MOBILE AND TRANSPORTABLE PHONES Figure A TYPICAL INSTALLATION A typical cellular phone installation consists of four basic components 1 power source 2 control head 3 transceiver logic unit and 4 antenna. phone may be permanently connected or hardwired to the vehicle s electrical system. In a portable system or one that is intended to be removed periodically for security reasons or for use away from the car a quick-disconnect plug or an adapter that lets the phone take its power from the car s cigarette lighter may be used. Control Head The part of a mobile cellular phone called the control head consists of the receiver and cradle with .
