Selection and positioning of antennas SAFEMASTER W Mounting and positioning of antennas Our experience. Your safety.

Comparison of frequencies 433 / 434 and 869 MHz? Antenna selection / gain Antenna selection / gain When choosing an antenna the characteristic and polarisation of antenna and receiver should be similar. It is also important to direct a high gain antenna very precisely to achieve the best transmission characteristic. Line of sight view between the antennas is recommended but not essential. Application areas Depending on the area, distance and possible reflections, the antenna size of 1/4 lambda or 1/2 lambda (higher gain) should be selected. ► 1/4 lambda antennas give a broader spread of signal...

When obstacles such as machinery and plant are in the radio direction path, this can reduce the transmission signal. Mounting height The number of obstacles and the way they are positioned can also have an influence. The length of the cable between radio module and antenna should be as short as possible to keep the losses as low as possible on the transmission signal. For outside applications the antenna cable should always approach and be connected from the bottom to the antenna. If this is not possible a drip loop could be implemented. For protection against weather influences at the cable...

SAFEMASTER W Distances For a reliable reception the correct distance and stable mounting and adjustment is important. It is best is to install the antenna as far as practical from obstacles (buildings, trees, poles, metal objects and other antennas). To avoid lightning strikes on outdoor applications, the antenna should not be mounted close to a lightning rod, and should have an over Voltage transient protection device fitted. For protection against weather influences at the cable antenna junction, weather tape is recommended for protection against ice and snow. Distances When using several fixed...

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