Các tế bào connetion P8

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 8.1). Most problems with installed car phones are a result of poor or improper...