Electronic Communications Act, 2005 (Act No. 36 of 2005)ICASANotice regarding Final Radio Frequency Assignment Plans for the Frequency Band 440 to 450 MHz in terms of Regulation 3 of the Radio Frequency Spectrum Regulations, 20157. Co-ordination Requirements |
| 7.1 | Coordination is performed by the Authority during the process of assignment. |
| 7.2 | Planning characteristics in border areas The location, the power, and the antenna heights of all stations in the network should be selected in such a way that their range is confined, as far as possible, to the zone to be covered by the intended service. |
Excessive antenna heights and transmitter outputs should be avoided, by using several locations of reduced height wherever possible. In border areas directional antennas should be used to minimise the interference potential.
The effective radiated power and the height of the antenna should be as low as possible in relation to the area to be served.
| 7.3 | In the event of any interference, the Authority will require affected parties to carry out coordination. If the interference continues to be unresolved after 24 hours, the affected parties may refer the matter to the Authority for a resolution. The Authority will decide the necessary modifications and schedule of modifications to resolve the dispute. The Authority will be guided by the interference resolution process as shown in Appendix B. |
| 7.4 | Assignment holders shall take full advantage of interference mitigation techniques such as antenna discrimination, tilt, polarization, frequency discrimination, shielding/blocking (introduce diffraction loss), site selection, and/or power control to facilitate the coordination of systems. |
| 7.5 | Indicative coordination thresholds for analogue or digital land mobile systems, as per T/R 25-08 17 |
| 7.5.1 | The aim of coordination thresholds is to avoid harmful interference between stations located in neighbouring countries. To achieve this, indicative coordination thresholds are established which should not be exceeded without coordination between neighbouring countries. |
| 7.5.2 | Indicative coordination thresholds for land mobile systems (co-channel, 50% locations, 10% time 18, 10 m receiving antenna height, within a reference bandwidth of 25 kHz, at the border-line) is 20 dB(μV/m). |
| 7.5.3 | For systems using a channel spacing greater than 25 kHz, the following bandwidth conversion formula can be used provided that the spectral power distribution within this channel spacing is uniform within the channel: |
BC = 10 x log10 (channel spacing / 25 kHz), dB
| 7.5.4 | The value (BC) resulting from the formula should be added to the indicative coordination threshold as listed above. |
| 7.5.5 | For all other spectral power distributions, indicative coordination threshold levels should be applied within every 25 kHz bandwidth within the channel spacing. |
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| 17 | Recommendation T/R 25-08: “Planning criteria and cross-border coordination of frequencies for land mobile systems in the range 29.7-470 MHz”, Approved 15 January 1990, Amended 28 September 2018, https://docdb.cept.org/document/909 |
| 18 | In certain situations, the 1% time curves should be used for digital systems, e.g. to better protect analogue systems. |