Kopp Free-control Mode D'emploi page 26

GB
Signalreduzierung der Funkübertragung in %
Signal reduction of the radio transmission in % (reference values)
Material
Rain, snow
Metal, metal grid, aluminium lining
Reinforced concrete
Brick, chipboards
Timber, gypsum, glass uncoated
Signal dispersion
Transmitter
actual wall
thickness
24 cm
low loss
Receiver
26
actual wall
thickness
55 cm
high loss
Signal reduction
ca. 60 – 100%
ca. 90%
ca. 75%
ca. 30%
ca. 10%
Receiver