3 Antenna heights, and h1 h2 If the value of or coincides with one of the heights for which curves are provided, the h1 h2 required transmission loss values may be obtained directly from the plotted curves or the associated tabulations. Otherwise the required transmission loss should be interpolated from transmission losses obtained from two curves using: dB (5) where: : the antenna heights above mean sea level for which the prediction is h1, h2 required (m) : the nearest nominal effective height below or 2 hinf h1 : the nearest nominal effective height above or 2 hsup h1 : transmission loss value for at the required distance Linf hinf : transmission loss value for at the required distance. Lsup hsup 4 Interpolation of transmission loss as a function of distance Unless coincides with one of the distances given in the tabulated values, the transmission loss, d should be linearly interpolated for the logarithm of the distance using: dB (6) where: : distance for which the prediction is required (km) d : nearest tabulation distance less than dinf d : nearest tabulation distance greater than dsup d : transmission loss value for Linf dinf : transmission loss value for Lsup dsup. 5 Interpolation of transmission loss as a function of frequency If the frequency for the prediction is not one of the frequencies represented in the figures of this Recommendation or in the tabulated data, the required transmission loss should be calculated using: dB (7) where: : frequency for which the prediction is required (MHz) f : lower nominal frequency finf : higher nominal frequency fsup : transmission loss value for Linf finf : transmission loss value for Lsup fsup. 6 Interpolation of transmission loss as a function of percentage time Transmission loss values for a given percentage of time should be calculated by interpolation using:
3 Antenna heights, h1 and h2 If the value of h1 or h2 coincides with one of the heights for which curves are provided, the required transmission loss values may be obtained directly from the plotted curves or the associated tabulations. Otherwise the required transmission loss should be interpolated from transmission losses obtained from two curves using: dB (5) where: h1, h2 : the antenna heights above mean sea level for which the prediction is required (m) hinf : the nearest nominal effective height below h1 or 2 hsup : the nearest nominal effective height above h1 or 2 Linf : transmission loss value for hinf at the required distance Lsup : transmission loss value for hsup at the required distance. 4 Interpolation of transmission loss as a function of distance Unless d coincides with one of the distances given in the tabulated values, the transmission loss, should be linearly interpolated for the logarithm of the distance using: dB (6) where: d : distance for which the prediction is required (km) dinf : nearest tabulation distance less than d dsup : nearest tabulation distance greater than d Linf : transmission loss value for dinf Lsup : transmission loss value for dsup. 5 Interpolation of transmission loss as a function of frequency If the frequency for the prediction is not one of the frequencies represented in the figures of this Recommendation or in the tabulated data, the required transmission loss should be calculated using: dB (7) where: f : frequency for which the prediction is required (MHz) finf : lower nominal frequency fsup : higher nominal frequency Linf : transmission loss value for finf Lsup : transmission loss value for fsup. 6 Interpolation of transmission loss as a function of percentage time Transmission loss values for a given percentage of time should be calculated by interpolation using:
R-REC-P.528-3-201202-I!!MSW-E.docx