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SEAMCAT always assumes the height of local clutter R , depending on the propagation environment set in the model selection window:
Table 8688: Default clutter height in the ITU-R P1546-1 model (when clutter height option not activated)Anchor T088 T088
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If the receiving antenna height, hr (m), is different from the assumed R value, as shown in Table 86 88 , a correction shall be added to the field strength taken from the curve.
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The field strength must not exceed a maximum value Emax given by:
EMax = Efs dB(
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µV/m) for land paths
where Efs is the free space field strength for 1 kW e.r.p. given by:
Efs = 106.9 - 20 log(d) (dB(mVµV/m)) (Eq. 239)
9 Convert field strength to path loss using following formula:
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Qi(x) = T(x) –x(x) if x £ 0≤ 0.5
Qi(x) = -{T(1-x) – x(1-x)} if x > 0.5
where:
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Dh: 
(km) (asymptotic term defined by horizon distances)
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