Skip to main content

who invented mobile phone

 

Who invented the Cell Phone? Know the story behind the first Mobile Phone

Who invented the cell phone? It is a tricky theory which leads into the world of stiffest competitions of the technical world. Take a look at the events that led to the discovery or invention of the first cell phone



The Cell Phone: Story behind its invention

While everyone knows Graham Bell invented the telephone in 1876, a lot of people have no idea about the inventor of the cell phone. On December 23, 1900, Reginald Fessenden accomplished the feat of developing a cell phone. 

The first wireless phone call was made by him. 

The human voice was able to transmit via radio waves and the signals were sent from one tower to another. His work made way for broadcast radio but also provided the foundation for cell phones and networks. 

William Rae Young:

The work of Fessenden inspired a young engineer named William Rae Young, who proposed that if radio waves were arranged in a hexagonal pattern they could support a telephone network. 

He worked under D.H Ring working in Bell Laboratories. 

Thorough low power transmitter calls were carried around networks. They accounted for handoffs, that is when the caller moves from one tower's broadcast radius to another. But though the theory was sound, the technology that could make it happen was lacking. 

But there was no technology available back then. 

What led to the world’s first cell phone?

AT&T offered some customers the chance to use radio telephones

They were like walkie-talkie transceivers and a very few calls could be made using them. Also no private calls could be held on them as there was lesser scope for them. 

The phones were bulky back then and it was impossible to carry them in my pocket. 

It was in the 1960's that Joel S and RH Frenkeil developed the technology on Young's model. 

AT&T sought permission from the Federal Communications Commission (FCC) to develop a cellular network, Motorola's Martin Cooper made a cheeky move in 1973.

Cooper's team designed the cell phone and gave it it's first design. The phone was named Motorola DynaTAC and was 22.9 centimetres long. The phone weighed 1.1 kilograms. 

The First Cell Phone call:

It was a prank call or a call made to tease the competition. Cooper made the call to Joel Engel, his professional rival who worked at Bell Labs. Since then it took many years to build proper cell phone networks and make cell phones a viable commercial product. Today almost every second person on the planet has a mobile or cell phone with him. 

Comments

Post a Comment

Popular posts from this blog

how to make simple inverter 3000W

how to make simple inverter 3000W   Direct current (DC) power to alternating current (AC) power is converted by inverters, which are electronic devices. During blackouts or when off the grid, a 3000W inverter can be a helpful tool for powering a variety of home appliances and electronic gadgets. Here are some instructions for building a basic 3000W inverter: Prior to beginning the inverter's construction, it's critical to ascertain the power requirements for the devices or appliances that the inverter will be used to power. Most household appliances should be able to be powered by a 3000W inverter, but it's necessary to verify each appliance's power needs to make sure they don't go over the inverter's capability. assemble the necessary elements: A DC power source is among the parts needed to make a 3000W converter. Power transistors, heat sinks, capacitors, resistors, a transformer, a power source (such a battery), an inverter board or kit. The circuit must be p

2 Exploring New Automatic Street Light Circuits for Effective Urban Illumination, or "Enlightening the Night"

 Exploring New Automatic Street Light Circuits for Effective Urban Illumination, or "Enlightening the Night" In this essay, we'll go through two(2) practical yet straightforward automatic street light circuits that employ solar power and 220 V relays. All of the circuits shown here can be used to automatically turn on a lamp at night and turn it off during the day. What is a Street Light Automation System? A device that detects the ambient light level conditions and automatically turns on or off an associated lamp depending on the ambient light level is called an automatic street light system. When it gets too dark in the evening and the light level drops below the device's detecting threshold, it switches on a connected lamp to light up the space. On the other hand, at dawn, when ambient light rises above the device's detecting threshold, it turns OFF the associated bulb. Without any human involvement, the bulb switches automatically on and off at different times

Harmonious Waves: Unveiling the Dynamics of the Pierce Oscillator Circuit"

 Harmonious Waves: Unveiling the Dynamics of the Pierce Oscillator Circuit This article teaches us how to construct straightforward oscillator circuits utilising a single CMOS gate, such as the Hartley oscillator and Pierce oscillator. Both oscillators are examples of low-component-count oscillators that produce incredibly consistent and dependable frequency outputs. Oscillator Pierce A pierce oscillator circuit, like the one depicted in the following picture, can be readily constructed using a single CMOS gate and is based on a crystal oscillator architecture. R1 is used to bias the single CMOS inverter to create a linear amplifier. Through the trimmer capacitor TCI, a crystal is visible linked to the piercing circuit's input and output. The intended circuit is intended to function at the crystal's series resonant frequency. It goes without saying that no positive feedback has been applied in this instance between the circuit's input and output. This is a result of the inp

Thermistors in Temperature Indicator Circuits

 Thermistors in Temperature Indicator Circuits To measure temperatures precisely, you might need a thermometer. In many instances, though, a relative estimate will do and an absolute value is not necessary. An LED may change colour or a basic LED illumination may be used to notify the user that, for instance, an electric drill or hoover cleaner is getting heated. If there was a green light on these monitors to show that the temperature was okay, that would be much better. To alert the user when the equipment gets too hot, the light must progressively change colour as the temperature rises. In this article, we'll design a basic temperature indicator circuit by utilising a PTC thermistor and an NTC. when is common knowledge, an NTC thermistor is a temperature-dependent resistor, meaning that when the temperature rises, the resistor's resistance falls. Because of this, it responds to rising temperatures with a negative resistance, earning it the moniker of negative temperature coe

A Comprehensive Guide to Designing a 12V DC to 220V AC Inverter Circuit & PCB

  A Comprehensive Guide to Designing a 12V DC to 220V AC Inverter Circuit & PCB 12V DC to 220V AC inverter circuit diagram" "12V to 220V inverter circuit design" "DC to AC inverter circuit schematic" "12V inverter circuit with PCB layout" "MOSFET-based inverter circuit" "Transformer-based inverter circuit design" You need an inverter to convert low-voltage DC (Direct Current) power, which is commonly received from a battery or solar panel, into high-voltage AC (Alternating Current) electricity, which is compatible with conventional home equipment. In this manual, we'll look at the design and assembly of a PCB (printed circuit board) and a 12V DC to 220V AC inverter circuit. This article will provide you helpful tips whether you're an electronics enthusiast or looking for a dependable power supply during crises. Before getting into the circuit design, let's establish a list of the fundamental parts required to build