why is the frequency of outgoing and incoming signal different in mobile phone ?
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In a mobile phone, it is possible to talk while moving. This becomes possible because of a cellular radio network technology (a replacement of telephone exchange system). Under a cellular radio network a given physical area is divided into smaller parts call cells (or cell zones). To completely cover a given area use of hexagonal cells is a best possible way as shown in the figure.
In every hexagonal cell a radio antenna is installed to receive and send radio signals to and from mobile phones physically present within the cell. All cell antennas present within an area are connected to each other through a network (the way computers are connected in internet). All network related works including handling of all the incoming and outgoing calls are managed by a central control room called Mobile Telephone Switching Office (MTSO). i.e. MTSO is basically a telephone exchange for mobile phone calls. Every cell antenna has a working range of minimum 1.5 to 2 km and maximum up to 48 to 56 or more km area around it. When a mobile phone is switched on, MTSO records its location by identifying the cell in which it is present. When a mobile phone user moves from one cell zone to another cell zone, MTSO of its own switches mobile phone link to new cell antenna. This way, user gets an uninterrupted link to talk while on move. Also, mobile phones use high frequency radio waves for conversation. Audio signals of these waves are better. As mobile phones works on cell division of physical areas they are also referred as cell phones.
In every hexagonal cell a radio antenna is installed to receive and send radio signals to and from mobile phones physically present within the cell. All cell antennas present within an area are connected to each other through a network (the way computers are connected in internet). All network related works including handling of all the incoming and outgoing calls are managed by a central control room called Mobile Telephone Switching Office (MTSO). i.e. MTSO is basically a telephone exchange for mobile phone calls. Every cell antenna has a working range of minimum 1.5 to 2 km and maximum up to 48 to 56 or more km area around it. When a mobile phone is switched on, MTSO records its location by identifying the cell in which it is present. When a mobile phone user moves from one cell zone to another cell zone, MTSO of its own switches mobile phone link to new cell antenna. This way, user gets an uninterrupted link to talk while on move. Also, mobile phones use high frequency radio waves for conversation. Audio signals of these waves are better. As mobile phones works on cell division of physical areas they are also referred as cell phones.
priyanka131:
Thnks for the full explanation of my questions.
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