Site Characterisation for SKA South Africa
MESA has been the EMC and RFI consultant for the South African SKA project since 2006. We have assisted with a wide variety of associated issues that range from applying the correct principles during hardware design to on-site characterisation and monitoring of interference related issues.
Renewable Energy Developments
The impact of renewable energy developments aimed for the Northern Cape centres around the declaration of an Astronomy Geographic Advantage Area 2013. This aims to minimise the contribution of RF interference to the area associated with new developments. MESA assists not only with the impact assessment of these developments, but also with the implementation of the required compliance measures.
Compliance for Lightning Protection
Lighting protection has a natural association with EMC hardening as both concepts rely on identifying where the interference current is flowing. As a result MESA is able to assist with compliance investigations of SANS 62305 series of standards. This includes both evaluating the installed protection systems as well as providing the necessary recommendation to ensure compliance.
Precompliance investigations are a more cost effective method of evaluating a product's likely state of compliance, and provides the developer the opportunity to determine a baseline emission profile. A part of this process can include implementation of mitigation measures in an iterative investigation to determine practical implementation measures to ensure compliance.
Some of the latest developments MESA is focussing on includes an adjustable comb generator capable of covering a frequency range of 100 MHz to 8 GHz with a constant output power of -10 dBm. With a compact form factor, a minimum of 10 hours continuous battery operation, and a constant power output with less than 3 dB variation across the band, it is an ideal reference source for broad band, high attenuation shielding effectiveness measurements. It can also be used for calibration purposes in propagation analysis where we are currently investigating the use of a wideband measurement platform in the form of a fixed wing UAV. The work is being done as part of a masters program involving Stellenbosch University and SKA SA. This platform will have a continuous flying time of close to 2 hours at a minimum ground speed of 30 km/h while carrying a payload of 4 kg. This will enable us to cover significantly larger areas that what can typically be done with other similar measurement systems.
Given MESA's close links to the academic environment, it is only natural that we offer both fundamental and advanced training in a field which sometimes does not receive enough consideration as part of the design process. Given the importance of accurate pre-compliance testing MESA has decided to present a dedicated one-day short course on Reverberation Chamber Calibration and Usage on 29 November 2019.
The course will be held at CPUT's new electrical engineering building making use of their recently calibrated chamber. The objective of this course is to provide a deeper insight into reverberation chamber operation and associated applications through measurements such as calibrated and radiated power characterisation. The relevant standard for reverberation chamber measurements, IEC 61000-4-21, will be used as reference.
The day will consist of a theoretical session in the morning with practical demonstration in the afternoon. Relevant notes will be provided
For registration details and further information please send and email to email@example.com,
Real-time condition monitoring of power lines
High speed cable connector design and optimization
EMI/EMS investigation and mitigation in systems
EMI consultation on the Cahora Bassa HVDC power line
South African Navy Corvette EMC investigation
Pre-compliance testing using alternative sensors
Overhead power line transmission systems
Product development in connection with office network systems
EMC site validation, test planning and result interpretation
RFID antenna designs
Computational electromagnetic modelling of antenna coupling on navy vessels