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In this paper it is shown how a power line can be used to conductively carry and re-radiate 2.45GHz Wi-Fi signals over a distance. This can be useful when a conventional RF links' line-of-sight operation at 2.45GHz is obscured for example in multiple story buildings where Wi-Fi has difficulty penetrating. Commercial Wi-Fi modems were used to transfer data on a power line for up to 65m (non-energised)...
The metal halide lamp is a high energy electric lamp that produces visible light by an electric arc tube and it is a type of high-intensity discharge (HID) that contains a fused quartz and mixture of gases. These lamps inject noise into the smart-grid power line communications (PLC) network. This can have a strong and negative effect when using the PLC system to control the automatic switching of...
The mercury vapor lamp is the oldest high intensity discharge technology lamp that uses an electric arc, and comes in different shapes and designs. It creates a very bright light by using an arc through vaporized mercury in a high pressure tube. This lamp can cause unwanted interference to the smart-grid network or power line communications channel when connected to the channel’s wiring system. In...
Power lines that carry communication signals tend to produce radiated electromagnetic interference (EMI). In this paper it is shown how this, usually negative effect, is used for contactless signal transmission. Commercial PLC modems operating in the 150kHz – 30MHz band are used and LAN signals are contactlessly transmitted and received up to 2m.
In this paper it is shown that conducted interference from a power converter differs when measured with and without a Line Impedance Stabilization Network (LISN). This is problematic as the true Electromagnetic Interference (EMI) of a converter is therefore difficult to characterize. Possible reasons for this difference are discussed showing to the influence of a LISN on measurements.
This paper shows the problematic aspects when estimating radiating current from digital PCB's with attached wires. Variances in the digital waveform, trasmission lines vs. lumped circuits, antenna ground interaction and antenna terminal impedance predictions were difficult to include in a simple lumped circuit model.
This paper deals with specific and difficult concepts when introducing EMC to engineers and technicians. It is based on the authors experience in presenting introductory short courses. Some concepts are difficult to grasp for first time students as it emphasises phenomena and techniques not necessarily found in other subjects. Five concepts are identified, discussed and possible solutions given for...
This paper gives an outline useful for introducing EMC (electromagnetic compatibility) design to first time students. It is based on the universal interference model and the concept of zoning. It structures the introduction to circuit design, filters, connections and shielding. The contributions of grounding and management are also incorporated into the outline.
Over the years a number of vegetation management systems has been evaluated and recommended. The Potch system is also a management system which was specifically developed for semi-arid regions where the rainfall is unreliable. The influence of this system on vegetation condition, was evaluated over four seasons. From the results it appeared that the vegetation condition in all paddocks, barring one,...
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