Communication - Mobile Masts
Mobile masts - they have their own jargon? Well yes it appears so.
Mobile mast jargon is very introvert and only really relevant to suppliers or installers on mobile
Many of the terms for mobile mast jargon appear
standard but their implementation or who they are used may not be that simple.
Mobile mast jargon is fairly new and still
Mobile mast jargon.
2G 2G, the second generation or GSM, is the technology currently used in the operation of mobile
3G, or third generation, is the generic term used for the next generation of mobile communications
systems. The new systems will enhance the services available today and offer multimedia and internet access and the
ability to view video footage. The third generation technology used in the UK is called UMTS. These services
operate at 2100 MHz. (2.1GHz).
Aerial/Antenna A device which transmits and receives radio waves. There are different designs in
Analogue First mobile phone technology which was phased out in the UK in 2001 with the introduction
of second generation technology.
Cabin A structure which protects transmitters and receivers from damage. They can be in the form of
large cabins or smaller cabinets.
Cell A geographic area of coverage that a radio base stations covers.
Dish Antenna Dish antenna transmit and receive highly focussed radio waves in one direction.
Electromagnetic Waves/Fields Electromagnetic waves are emitted by many natural and man-made sources
and play a very important part in our lives. Electromagnetic waves are used to transmit and receive signals from
mobiles phones and their base stations. The type of electromagnetic waves mobile phones use is called radio
frequency (RF) waves/fields.
Feeder cable The co-axial cable which connects an antenna to a base station transmitter or
Frequency Frequency is the number of times per second at which an electromagnetic wave oscillates.
It determines the wave's properties and usage. Frequencies are measured in hertz (Hz). 1 Hz is one oscillation per
second, 1 kHz a thousand, 1 MHz is a million and 1GHz is a thousand million. Frequencies between 30 kHz and 300 GHz
are widely used for telecommunication, including broadcast radio and television, and comprise the radio frequency
band. Mobile telephone systems currently operate at 900MHz and 1800MHz.
GSM GSM - Global System for Mobile Communications or Groupe Speciale Mobile is the international,
pan-European operating standard for the current generation of digital cellular mobile communications. It enables
mobile phones to be used across national boundaries. GSM systems are operated by O2 and Vodafone at 900 and 1800
MHz, and by T-Mobile and Orange at 1800MHz.
HPA The Health Protection Agency is an independent body that protects the health and well-being of
everyone in England and Wales. The Agency plays a critical role in protecting people from infectious diseases and
in preventing harm when hazards involving chemicals, poisons or radiation occur. It also prepares for new and
emerging threats, such as a bio-terrorist attack or virulent new strain of disease.
ICNIRP The International Commission on Non-Ionizing Radiation Protection (ICNIRP) is an independent
scientific body which has produced an international set of guidelines for public exposure to radio frequency waves.
These guidelines were recommended in the Stewart Report and adopted by the Government, replacing the National
Radiological Protection Board (NRPB) guidelines. The mobile network operators have accepted these guidelines and
work within them.
Macrocell A macrocell provides the largest area of coverage within a mobile network. The antennas
for macrocells can be mounted on ground-based masts, rooftops or other existing structures. They must be positioned
at a height that is not obstructed by terrain or buildings. Macrocells provide radio coverage over varying
distances depending on the frequency used, the number of calls made and the physical terrain. Macrocell base
stations have a typical power output in tens of watts.
Mast A ground-based structure that supports antennas at a height where they can satisfactorily send
and receive radio waves. A typical mast is 15m high, and of steel lattice or tubular steel construction. New
slimmer versions of masts are now available which can be painted to blend in with their surroundings, disguised as
trees or used in conjunction with street lighting and CCTV cameras. Masts themselves play no part in the
transmission of the radio waves.
Maximum Ground Level Emission Maximum Ground Level Emission or the beam of highest intensity
usually occurs between 50m and 200m from an antenna. The ground level emission within this area is the highest
circling a base station. It is usually many thousands of times lower than international public exposure guidelines.
Emission levels reduce rapidly as the distance increases from the antenna. The highest emissions levels are
directly in front of the antenna, 15m or more off the ground.
Microcell Microcells provide additional coverage and capacity where there are high numbers of users
within urban and suburban macrocells. The antennas for microcells are mounted at street level, typically on the
external walls of existing structures, lamp-posts and other street furniture. Microcell antennas are smaller than
macrocell antennas and when mounted on existing structures can often be disguised as building features. Microcells
provide radio coverage over distances, typically between 300m and 1000m and have lower output powers compared to
macrocells, usually a few watts. NRPB The National Radiological Protection Board (NRPB)', now part of the Health
Protection Agency (HPA), has two main functions: to advance knowledge about the protection of mankind from
radiation hazards and to provide information and advice to persons in the UK with responsibilities relating to
protection from radiation hazards.
Picocell A picocell provides more localised coverage than a microcell. These are normally found
inside buildings where coverage is poor or where there are a high number of users such as airport terminals, train
stations or shopping centres. Radio Base Station A radio base station is a macrocell, microcell or picocell site
and consists of transmitters and receivers in a cabin or cabinet connected to antennas by feeder cable.
Second Generation See 2G
Sectored Antenna Antenna which transmits or receives higher signal levels in a horizontal
direction. The antenna is split into several sectors (typically 3 or 6) to provide 360 degree coverage.
Stub Mast A roof-mounted mast structure which supports multiple antennas at a height where it can
satisfactorily send and receive radio waves. A stub mast is typically 4m - 6m high and of steel lattice
construction. Stub masts themselves play no part in the transmission of radio waves.
Third Generation See 3G
Transmitter Electronic equipment that generates radio frequency electromagnetic energy and is
connected to an antenna via a feeder cable.
UMTS Universal Mobile Telecommunication System (UMTS) is part of the international vision of a
global family of third generation mobile communication systems. The UK refers to this as 3G.
Wavelength Wavelength is the distance in metres between any two 'similar' points on a radio wave.
This portion of the wave is referred to as one complete cycle. The lower the frequency of a wave the longer the
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