Coverage - Eemits Communications Ltd

Coverage

Radio frequencies require an almost clear path between two units in order to communicate with one another effectively and clearly. This however is not always possible, so there are a number of solutions available, depending on the need and the circumstances.

Typically, problem sites tend to be:

  • Rural
  • In Building
  • Manufacturing and processing plants
  • Mines
  • Underground
  • Tunnels
  • Airports
  • Railways

Solutions to coverage problems include:

Repeater

Repeaters are used to extend or improve the radio coverage area. When obstructions are placed in between two handsets operating in a back-to-back manner, or when there is a large distance between them, then poor coverage can be an issue with Two Way Radios. This poor coverage is often referred to as black spots or dead zones.

This can happen, for example, on a large and sprawling industrial site or campus. Both problems are equally frustrating and can be avoided by installing Two Way Radio Repeaters.

A repeater acts as a mid-way point for a radio signal. In the case of an obstruction, the repeater is ideally placed on top of the obstruction giving a clear path over or around it. In the case of distance, then a repeater effectively shortens the distance by acting as a hop or bounces to improve the signal and increase the range.

Because a two way radio cannot receive and transmit on the same frequency, a repeater is programmed so that it receives the transmission on one frequency and simultaneously transmits it on another meaning there is no delay in the transmission.

Repeaters are often able to submit performance and diagnostic information back to a central hub, that can be very helpful in enhancing the overall performance of the radio system by providing a thorough performance audit.

Leaky Feeder

A leaky feeder is both antenna and feeder. Like the name suggests, a Leaky Feeder is a length of cable with holes in the outer casing allowing signal to 'leak' from it. This creates a series of small antennas which fill their locations with signal. This means that when it is laid along a tunnel, it doesn't matter how long or twisty it is, the signal will always allow a two way radio connection.

Distributed Antenna System (DAS)

Buildings are made up of a lots of components that can interfere with Radio Frequency (RF) signals. A distributed antenna system (DAS) overcomes these obstacles by using repeater systems with distributed antennas. By routing radio frequency signals through cabling to appropriately distributed antennas located throughout a building or site, DAS alleviates any dead zones or black spots in coverage for two way radio communication.

Passive Antenna

To alleviate the problems of poor radio coverage inside buildings, "passive antennas" can be installed on to the exterior and interior of the building and connected together. The antenna on the inside picks up a small amount of a user's handheld signal and re-radiates it using the outside antenna. During reception, the inside antenna re-radiates the signal picked up by the outside antenna.

There can be considerable loss in the system, especially if a significant run of transmission cable is used.

In-Vehicle Repeater

In vehicle repeaters use a combination of a radio receiver and a radio transmitter to extend two way radio coverage in areas where it may be weak or non-existent.

The system, which can be either fixed in a vehicle, or can be configured as a transportable unit, receives a weak signal and re-transmits it at a higher level.

This solution is particularly cost effective and is used widely among emergency, transport or security services.

Cell Extender

A cell extender is typically used for a specific location to enhance radio coverage where it is essential for two way radio communications to take place. This could be to alleviate dead zones or black spots such as a specific building or basement and are often referred to as in-fill sites.

As a business grows more dead zones may appear and more voice channels may be required, Cell Extenders can be scaled appropriately to meet these new requirements.

Past Projects

Reactive Maintenance Reactive Maintenance

One of Europe's leading emergency response providers is supported by Eemits Communications with a 2 hour Service Level Agreement (SLA) which operates 24/7/365 days a year.

eemits communications - problem solvers eemits communications - problem solvers

It is good that I can just talk to one of the engineers and be talked through problems over the phone, rather than wait for them to come over and incur call out charges.

Middlesbrough Council

We needed a supplier that could offer speed of response in order to ensure continuity of systems. Suppliers need to build relationships with clients in order to understand ongoing requirements to enable them to offer effective solutions.

SembCorp

We have historically used licence free radios for our school and as a result suffered with poor communication and constant failure of the equipment. Eemits provided us with entry level licensed radios with built in panic alarms to compliment our emergency evacuation procedures. Our communications are now exceptionally clear and we are confident that we have been supplied the right product for our needs.

Moor House School

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