elero – Radio system Instructions for range planning The elero radio system offer a high degree of flexibility and ease of installation compared to hard wired systems. However some conditions have to be fulfilled in order to permit defect-free and thus convenient (radio) operation for the user. Basics for radio signals inside buildings Radio waves are electromagnetic waves containing information such as a travel command which is „sent“ from the transmitter to the receiver. The range of the radio signal strongly depends on obstructions, which have to be penetrated. These are the materials used in buildings, which more or less weaken (attenuate) the signal depending on their nature. Poor transmitter and receiver installation locations also have a negative effect on the radio range. The following table and sketches provide information about radio ranges in buildings in relation to the type of material used and the installation location. used:: Radio ranges with respect to different building materials used Line of sight connection: approx. 70m range in corridors, up to 100m in halls Plasterboard / wooden walls: approx. 40m range through a max. of 5 walls brick/ cellular concrete: approx. 30m range through a max. of 3 walls reinforced walls / ceilings: approx. 12m range through a max. of 2 walls Building materials weaken (attenuate) radio signals and are thus partially responsible for reducing the radio range: Material Attenuation wood, plaster, uncoated glass, without metal brick, fibre board iron reinforced concrete metal, aluminium covering 0......10% 5......35% 10......90% 90.....100% elero – Radio system Instructions for range planning Other criteria which reduce the radio range: Installation of the switch on a metal wall Ø- value = 30% range loss Use of a metallic switch surround Ø- value = 30% range loss Hollow lightweight walls with insulation wool on metal foil False ceiling with metal or carbon fibre panels Lead glass or metal coated glass, steel furniture Installation tips: Firewalls, lift shafts, stair wells and supply areas usually have special partitioning. The partitioning, partitioning or radio shadows as they are called, can be overcome by repositioning the transmitter and/or receiver. Alternatively a repeater (amplifier) can be used. Metal plate Metal plate WALL Roller shutter drive with radio receiver Hand-held transmitter WALL Repeater elero – Radio system Instructions for range planning Penetration angle: The angle, at which the radio signal hits the wall is plays an important role. If possible the signals should penetrate as perpendicular to the brickwork as possible. Wall niches are to be avoided. WALL WALL Devices with internal receiver antenna should not be installed on the same side of the wall as the transmitter. It is better to install on the opposite or adjacent wall surface. WALL Wall transmitter elero – Radio system Instructions for range planning Distance between the receiver and other radio sources The distance to other radio sources (e.g. GSM/DECT/Wireless LAN) and high frequency interference sources (computer, Audio and Video systems) should be at least 50 cm. cm > 50cm > 50cm Receiver Use of repeaters: In case of problems with the quality of the reception the use of a radio amplifier or so called „Repeater“ can be helpful. The elero 868 repeater does not require any configuration. It receives the radio signal and relays it thus increasing the range almost two fold. Field intensity measurement device: Elero has developed the RadioTester for optimised transmitter and receiver position determination. The field intensity is displayed simply by three LEDs on the device. These LEDs are used for help in determining the best location.
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