alre B@home System, Руководство пользователя

Страница: 19 / 25

19
Prefixes to the unit:
Designation Unit Factor Is the equivalent of
Hertz Hz 1 1 Hz
Kilohertz kHz 10³ 1000 Hz
Megahertz MHz 10 6 1000 000 Hz
Gigahertz GHz 10
9
1000 000 000 Hz
Terahertz THz 10
12
1000 000 000 000 Hz
16.3 Signal strength / absorption
The signal strength is reduced by materials on the transmission path between the transmitter and receiver. This is known
as signal attenuation. The degree of attenuation is greatly dependent on the type, thickness and density of the material.
Material Penetration Example
Wood / wood with plasterboard Very good Internal partitions
Plastic Very good Plastic windows
Glass normal, metallised Good Window panes
Bricks Average External wall
Water Average People, aquariums
Concrete with steel reinforcements Poor Solid walls
Metal Very poor Fire doors
Additional attenuation from the following may also have to be taken into consideration:
•
Installation of wireless components in a flush-mounted socket
•
Metal coatings, e.g. on furniture and wall coverings
•
Planted areas
•
High air humidity