The cordless phone is one of those inventions that affect our lives in a positive way, but we don’t even realise it. With a cordless phone, you don’t have to say in one location in your house while you are on a telephone call. You will be able to speak on the phone while moving freely throughout the home, a freedom that we sometimes take for granted.

Have you ever thought about how cordless phones work, or when they were invented? Let’s take a look at how cordless phones work and the history of this important office and home technology.

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The History of the Cordless Phone

The first cordless phones ever were introduced in the 1970s. Long before mobile phones became cheap enough for anyone to afford, a cordless phone was an important accessory in the home that made taking phone calls so much easier.

The very early cordless phones that were used in the 1970s and 80s did not operate very well. They had a limited range and very poor sound quality – because other appliances and walls would interfere with the signals. Also, they were not very secure because people could intercept the signals from other phones –as there were only a limited number of channels.

Over the decades, cordless phones have improved in quality and range, advancements in technology allowing them a much greater frequency range and gradually requiring less power to run. The digital cordless phone was introduced in the 1990s and they were developed with more security, in order to decrease the possibility of eavesdropping. In 1998, cordless phones began being produced to operate at the 2.4 GHz range. This meant that they could be used over a greater distance and they were also out of the frequency range of radio scanners.

When you are buying a cordless phone, there are a lot of factors to consider – such as the battery life, the strength of the radio signal, the range of the phone and the security of the signal and whether or not it can be listened in on.

How Does it Work?

Have you ever looked at your cordless phone and wondered how exactly it works? A cordless phone is much different than a mobile phone. It is not a mobile phone which picks up a signal, it is a traditional land-line which has a radio transmitter and a receiver.

The cordless phone will come with a base, which will plug into your standard phone jack. It will also include a handset for listening and speaking. Instead of the handset communicating with the phone base via a wire, it uses a radio transmitter instead. When the sound comes in from the phone call, it is converted into radio waves which are then broadcast.

The phone has a number of important radio components within it, which will convert the signals into radio waves and broadcast them via the antenna. These components actually use quartz crystals, which set the radio frequencies for receiving and sending. The base and the handset allow you to talk and listen at the same time which is known as a “duplex” frequency pair.

The handset will receive the radio signal and then will convert it into an electrical signal. This electrical signal is the sound that you hear through the speaker, which converts the electrical signal into sound.

When you speak into the receiver, your voice will also be converted into an FM signal. There is a microphone within the handset which will transform your voice into an electrical signal, which it will send to the audio amplifier. The phone handset will broadcast this signal back to the base, which will then convert it into electrical signals and send it back through the phone line. The handset also has a number of other important features, including a keypad, microphone, buzzer and an LCD display. It is operated via a rechargeable battery.

When it comes down to it, your basic cordless phone is really a combination of a telephone and an FM radio receiver or transmitter. Now that you understand how this common piece of phone or office technology works, you will know what to look for when you are purchasing your next phone.