FREQUENCY & FREQUENCY BAND IN MOBILE CELL PHONE

Frequency and Frequency Band in Mobile Cell Phone
Frequency and Frequency Band – The wave produced per second from a medium is called frequency. Specific range of frequencies is called frequency band.. Lear more about Frequency and Frequency Band used in mobile phone and telecommunication.

What is Frequency?

The wave produced per second from any medium is called frequency and is denoted by “F”. Unit of measuring frequency is “Cycles per Second”. It is denoted by C/S. “Cycle per Second” is also known as “HERTZ” Unit. Hertz is denoted by Hz. C/S and Hz are same units. The units bigger than Hertz are correlated as follows:
  • 1000 Hz (Hertz) = 1 KHz (Kilo Hertz)
  • 1000 KHz = 1 MHz (Mega Hertz)
  • 1000 MHz = 1 GHz (Giga Hertz)

Frequency Bands in Mobile Phones

A specific range of frequencies which are used in telecommunication for a particular purpose is called band. This is a part of long series of frequencies.

Band Width or Bandwidth


Bandwidth or Band Width is a term used to define the quantum of frequency space taken by a signal and is necessary for effective transfer of the information carried by the signal.

Dual Band Devices

These are gadgets which have the capability of functioning under two different frequency bands. Generally mobile cell phones work on dual band frequency network. It is designed to work on 900 MHZ and 1800 MHZ. It is called 900 MHz or GSM900 Band. Its bandwidth is between 935 to 960 MHz. 1800 MHz band is called GSM1800 or DCS1800. Its bandwidth ranges from 1805 to 1880 MHz.

Comments

Post a Comment

Popular posts from this blog

SURFACE MOUNT TRANSISTOR IN MOBILE PHONE & THEIR FUNCTION

Image
Surface Mount Transistor in Mobile Phone and Their Function Surface Mount Transistor or SMT Transistor is an SMD electronic component  made up of semiconductor material like silicon or germanium. There are 2 types of Surface Mount Transistors: NPN Type PNP Type Terminals of a Transistor There are three terminals of a surface mount transistor or thru-hole transistor: Ammeter (E) – Flows current on receipt of forward bias. Electrons are emitted in NPN transistors whereas PNP transistors emit ‘ holes ’. Collector (C) – The terminal of the transistor which receives the emitted electrons or holes. Collector always works or reverse bias mode. Base (B) – The layer between ammeter and collector is called base. Base displays the property of showing low resistance in ammeter junction forward bias and high in collector junction reverse bias. Facts about Transistor Indicating Character : Q or V, TR Function : Switching, Amplification, Regulating Voltage.
Read more

MOBILE PHONE AND THEIR ELECTRONIC COMPONENTS FUNCTIONS

Image
Small Parts / Electronic Components of Mobile Phone and Their  Function                               The PCB of a mobile cell phone has several small parts or electronic components. When LEARNING MOBILE REPAIRING , it is important to learn and understand how to identity these small parts or electronic components and understand their function. Identification of these small parts on the PCB OF MOBILE PHONE is easy if you know and understand some of the basic rules. It is also important to understand what to do if any of these small components is faulty. Most of these electronic components are SMD  ( SURFACE MOUNT DEVICES) They don’t have any leads like thru-hole ELECTRONIC COMPONENTS .                                                                                                              Small Parts / Electronic Components of a Mobile Phone: Identification, Faults and Function: 1. Boost Coil Its size is little bigger than coil. It is found in black colour and look
Read more

REMOVE HEADPHONE ICON FROM NOTIFICATION BAR

Image
How to Remove Headphone Icon from Notification Bar Headphone Symbol not going from the Notification Bar of Android Mobile Phone or Headset Icon not going from the Notification Bar is a very common Problem. In this article I will Explain 100% sure solution on How to Remove the Headphone Icon from any Android Mobile Phone if your Phone is Stuck in the Headphone Mode. PS   : This headphone symbol not going away from the notification bar is most common problem in Redmi Note 3, Redmi Note 4, Some Models of Oppo, Nokia, Samsung Duos and LG. These Tips to Fix the Headphone Icon Problem is applicable to all Brands of Android Phone including – Xiaomi (Redmi), Realme, Gionee, Alcatel, Blu, Celkon, Coolpad, Hitech, Fly, Huawei, Lava, Lenovo, Micromax, Oppo, Samsung, Vivo,  Panasonic, ZTE etc. Problems Caused when Head phone Icon Stuck in Notification Bar The phone goes in headphone mode even when the headphone is not plugged-in. When you increase or decrease volume of any Medi
Read more