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Radio quiet zone; compliant electric fence; alternatives
Thesis (MEng)--Stellenbosch University, 2023.
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| Format: | Thesis |
| Language: | en_ZA en_ZA |
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Stellenbosch : Stellenbosch University
2023
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| _version_ | 1867613753821888512 |
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| access_status_str | Open Access |
| author | Mabusha, Kabo |
| author2 | Strauss, Johann |
| author_browse | Mabusha, Kabo Strauss, Johann |
| author_facet | Strauss, Johann Mabusha, Kabo |
| author_sort | Mabusha, Kabo |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2023. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/129022 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA en_ZA |
| last_indexed | 2026-06-10T12:41:09.576Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/129022 Radio quiet zone; compliant electric fence; alternatives Mabusha, Kabo Strauss, Johann Stellenbosch University. Faculty of Engineering. Dept. of Electrical and Electronic Engineering. Radio -- Transmitter-receivers Agricultural innovations Radar transmitters Signals and signaling Radio -- Interference Electric fences Thesis (MEng)--Stellenbosch University, 2023. ENGLISH ABSTRACT: When two communities with different requirements need to share the same space, this needs to be negotiated between them. The Karoo desert in the Northern Cape is such a space where the radio telescope and farming community are two of the communities sharing this space. The international astronomy community awarded South Africa the opportunity to construct the largest radio telescope in the world. Radio astronomy uses extremely sensitive receivers known as radio telescopes to detect minute signals from the space. Due to the high sensitivity of the radio telescopes, in order to pick up small signals from far away; corrupting signals from unwanted closer sources may be present. Therefore these receivers require extensive protection from these unwanted signals. Radio astronomy needs to be isolated from a noisy, emission-rich, mostly urbanised technological society in order to be effective. The Karoo is a perfect place to declare a Radio Quiet Zone (RQZ) and this was done by introducing the Astronomy Geographic Advantage Act. Remote as it is, the Northern Cape is home to numerous small livestock farming communities. Small animals in this area are often susceptible to predators like foxes, jackals and caracals. To protect their animals, farmers turned to electric fencing. When touched by an external object, electric fences experience a short and high impedance. The also arc when experiencing a short. This arcing becomes a problem to the radio as- tronomers, due to wide-band noise in the frequency spectrum caused by fast-rising pulses. RFI analysis was carried out on how deferent disturbances on an electric fence affects the MeerKAT and SKA telescopes by being present on the frequency bands where as-tronomy observations are being carried out. Arcing signals from commercial energisers were observed to have sharp and high-magnitude pulses in the time domain (TD) and are present at high frequencies in the frequency domain (FD). The SKA telescopes in the spiral arms would be directly affected by such signals since some of the telescopes are close to the farm perimeter fencing. A proposed solution to reduce arcing in electric fences is formulated and discussed in this project. A comparison of RFI signals based on deferent commercial energisers and disturbance sources was made, and it was observed that these pulses were different for every energiser and disturbance. Detection of distur- bances of the line were shown to relate to changes in impedance that affect the damping of the voltage pulse through simulations. This voltage pulse is used to monitor the fence, and the energiser only injects high voltage pulses into the fence when a living being is the disturbance source. In conclusion, an intelligent energiser that has a control unit is specified to be the solution for reducing possible pulses that can occur in a quiet radio zone (RQZ). AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar. Masters 2023-11-20T12:25:22Z 2024-01-08T19:34:02Z 2023-11-20T12:25:22Z 2024-01-08T19:34:02Z 2023-12 Thesis https://scholar.sun.ac.za/handle/10019.1/129022 en_ZA en_ZA Stellenbosch University xvii, 103 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Radio -- Transmitter-receivers Agricultural innovations Radar transmitters Signals and signaling Radio -- Interference Electric fences Mabusha, Kabo Radio quiet zone; compliant electric fence; alternatives |
| title | Radio quiet zone; compliant electric fence; alternatives |
| title_full | Radio quiet zone; compliant electric fence; alternatives |
| title_fullStr | Radio quiet zone; compliant electric fence; alternatives |
| title_full_unstemmed | Radio quiet zone; compliant electric fence; alternatives |
| title_short | Radio quiet zone; compliant electric fence; alternatives |
| title_sort | radio quiet zone compliant electric fence alternatives |
| topic | Radio -- Transmitter-receivers Agricultural innovations Radar transmitters Signals and signaling Radio -- Interference Electric fences |
| url | https://scholar.sun.ac.za/handle/10019.1/129022 |
| work_keys_str_mv | AT mabushakabo radioquietzonecompliantelectricfencealternatives |