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Annex 5, § 14 of Recommendation ITU-R P.1546-5 gives a correction to account for the difference between the two antenna heights above ground. This correction is calculated as follows.
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| body | ${\rm{Correction}}\;\; = \;\;20\log \left( {\frac{d}{{{d_{slope}}}}} \right)$ |
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dB (YY)
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Where terrain information is not available, use:
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| body | ${d_{slope}} = \sqrt {{d^2} + {{10}^{ - 6}}{{\left( {{h_a} - {h_2}} \right)}^2}} $ |
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km (YYb)
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If the horizontal distance is less than or equal to 0.04 km the field strength, E, is given by:
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| body | $E = 106.9 - 20\log \left( {{d_{slope}}} \right)$ |
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dB(mV/m) (ZZa)
Otherwise
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| body | E = {E_{inf}} + \left( {{E_{sup}} - {E_{inf}}} \right) \cdot \log \left ( \frac{d_{slope}}{d_{inf}}\right )/log \left ( \frac{d_{sup}}{d_{inf}}\right ) |
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dB(mV/m) (ZZb)
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