Researchers from the University of the Witwatersrand and the University of Bordeaux have unveiled a technology that could revolutionise the way free-space optical links are built. They have demonstrated that information carried by a laser beam can withstand severe atmospheric turbulence without the need for any optical correction. This approach is completely different from all previous FSO systems, which must measure distortions, compensate for them using adaptive optics, and perform complex ca...

Calibration of a fibre optic fusion splicer involves adjusting the power and temperature of the electric arc generated to suit the current environmental conditions. A correctly adjusted arc enables the production of sound splices – both in terms of attenuation and strength. Calibration should therefore always be carried out before the actual welding begins – at the start of work or when conditions change drastically (e.g. a sudden drop in temperature resulting from finishing welding indoors and...

Ballast masts are structures designed for the installation of antennas, lighting, signalling or other equipment on roofs and other flat surfaces, without the need to interfere with the structure of the ground. Their stability is ensured by appropriately selected ballast (usually concrete weight plates), which prevents the mast from toppling under the influence of wind or vibrations. Ballast masts are widely used in temporary and permanent installations, particularly where permanent anchoring of...

SD cards are a key component of CCTV systems and are used in both IP cameras and mobile recorders. Choosing the right card is crucial for stable recording, high-quality footage and reliable operation. In the context of CCTV, the card’s technical specifications – such as capacity, speed class and durability – are particularly important....

When selecting an antenna, it is necessary to obtain information on the location of the nearest transmitters that emit a signal in a specific standard. Such information is provided by customer service offices of the respective operators. It is also worth to verify the frequency of emission assigned to a particular service....