Radio Frequency System
What is RFC?

RFC is a buried detection system that uses the well known "leaky cable " principle. Two special cables are buried parallel to one another around the perimeter of the site and the area between the two cables forms a sensitive detection area.

RFC can be used in all types of topography and, being buried, the entire system is completely invisible.

RFC is an active system and it creates a sensitive area that extends above ground for between 1 and 0.5 metres.

RFC uses 2 specially manufactured underground cables which are normally buried 25 cms deep and 1.5 metres apart.

The cables are specially constructed with an incomplete screen which will allow radio frequency signals to pass through under certain conditions. One cable carries a radio frequency signal and is called the transmitter cable. The signal will pass through, or "leak" through the screen into the surrounding area. The other cable will allow the radio signal so created to pass through the screen and therefore act as a receiver.

The signal transmitted is continuously compared with the signal received. When a person enters the area of the radio field the received signal will vary due to the effect of the intruders body mass on the field.

The resultant signal is subjected to complex analysis by the sensor to determine whether it has reached the alarm thresholds and also whether it matches particular signal patterns.

When all the criteria are met the signal is passed to a central unit which will interface into most alarm control and monitoring systems.

Surface types

The RFC system can be installed under most surfaces including sand, soil, gravel, paving slabs, asphalt etc.

Topography

The inherent flexibility of the cable allows the system to easily follow ground contours, without altering its performance.

System configuration

Each sensor will have two zones of protection each up to a maximum of 100 metres in length. Each zone will have two cables terminated at one end and connected to the transmitter/receiver at the other.

By linking multiples of this basic configuration any length of perimeter can be protected. The sensors, up to a maximum of 64, are connected to a common 4 core cable. When more than 64 sensors are required, multiple control units are used accordingly

RFC Cable Installation


RFC Signal Generator/Mixer

Components

Sensitive cable - This is the underground cable used to transmit and receive the rf signal. A special screen construction allows the radio frequency signal to pass from one cable to the other.

Receiver/Transmitter - This unit generates the rf signal that is transmitted and compares it with the signal received. It can monitor two independent zones of up to 100m each.

Peripheral Sensor - This unit houses the micro-processor based electronics for the signal analysis and all the communication interfaces for linking into the MX2000 network. All materials used are suitable for direct burial and protected against chemical agents typically found underground.

Communications Cable - This is a 4 core fully screened, cable with protective outer sleeving suitable for direct burial. It links the Peripheral sensor to the central Universal Communications Processor of the MX2000 system.