This annexure relates to sub-regulation 6(4)(a) of these Schedule B Regulations. The intention of the information provided in this annexure is to assist competent persons or any other person involved in the determination of radio frequency interference levels. The information is not meant to be prescriptive or limiting of the standards and techniques that may be used and that may provide results with a higher level of accuracy. The options stated may be considered as the minimum standards applicable to carry out radio frequency interference level predictions.
| 1. |
ITU Recommendation ITU-R P.1144 - Guide to the application of the propagation methods of Radiocommunication Study Group 3. This recommendation lists the ITU-R radio wave propagation prediction methods that may be used for the different applications. The options applicable to radio frequency interference predictions that relate to Schedule A of these Regulations, are listed below. |
| 1.1. |
Recommendation ITU-R P.452 - Service employing stations on the surface of the Earth; interference |
| 1.2. |
Recommendation ITU-R P.526 - Propagation by diffraction |
| 1.3. |
Recommendation ITU-R P.528 - Aeronautical mobile |
| 1.4. |
Recommendation ITU-R P530 - Line-of-sight fixed links |
| 1.5. |
Recommendation ITU-R P.617 - Trans-horizon fixed links |
| 1.6. |
Recommendation ITU-R P.2001 - Terrestrial services |
| 2. |
The Longley-Rice model accepted by the Federal Communications Commission in the United States of America may also be used as it is employed in a number of computerised prediction programmes on the market. |
| 3. |
Other methods for determining the propagation path loss may also be used with agreement of the management authority. |
Stamp Duties Act, 1968 (Act 77 of 1968)
