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What is the electromagnetic spectrum?

ELECTROMAGNETIC SPECTRUM

The electromagnetic spectrum is the range of all types of electromagnetic radiation. Radiation is energy that travels and spreads out as it goes - light from a lamp and radio waves from a radio station are both types of electromagnetic radiation.

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RADIO FREQUENCIES

From low to high frequency, the electromagnetic spectrum can be divided into radio, microwave, infrared, visible, ultraviolet, x-ray and gamma ray.

Radio, television, mobile phones, microwaves, satellite communications and radar all use frequencies from about 1 million Hertz (1 MHz) to 100 billion hertz (100 GHz).

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ULTRA HIGH FREQUENCIES

In the UK the telecoms regulator Ofcom licences the use of parts of the radio and microwave spectrum.

Television and mobile phones use the part of the spectrum called ultra high frequency - UHF - which ranges from 300 MHz to 3 GHz.

Before summer 2013, mobile services in the UK could use spectrum at 900 MHz, 1800 MHz, 1900 MHz, 2100 MHz, 2.6 GHz, 3.5GHz.

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DIGITAL TERRESTRIAL TELEVISION

4G is now being activated at a new frequency: 800 MHz.

This frequency has been made available by the move from analogue to digital television. TV previously used frequencies from 470 MHz to 862 MHz.

Now television stops at 790 MHz and new 4G mobile services are being provided that operate between 791 MHz and 862 MHz.

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4G AT 800 MHZ

Since the digital switchover, channels 61 to 69 have been reserved for 4G data signals. This is currently rolling out across the country.

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4G & DTT TOGETHER

TV is transmitted on different sets of frequencies in different parts of the country.

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4G ISSUES WITH DTT

TV is transmitted on different sets of frequencies in different parts of the country.

So, will you be affected?

AFFECTED?

In areas where new 4G mobile services are activating we send postcards to let people know that they may experience TV interference.

If you receive a card and experience new TV interference please contact us for advice on how to resolve it.

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