Reference: Estimation Methods Of Rx/Tx Signal Loss By Physical Obstructions - JRC JUE-95SA Instruction Manual

4.4.4 Reference: Estimation methods of RX/TX signal loss by physical obstructions

Attenuation with the obstacle calculates easily in the following method.
I. Estimation procedure with the chart (for cylindrical obstacles)
i) Estimate the distance (R) from the obstacle;
ii) Estimate the effective diameter (d) of the obstacle; d (m)
iii) Read off the loss (L
iv) Determine whether the loss (L
Fig.4.4.4a EME Installation against cylindrical obstacle
*Under lower elevation angle area, sometimes the communication might be impossible due to fading
or weather condition.
) in the Chart I;
B
) is allowable.
B
Example
i) R:5
ii) d:02m
iii) L
iv) Allowable
Chart 4.4.4b The Loss Due to cylindrical obstacle
NOTE
4-5
R (m)
L (dB)
B
Pole
or
Mast
:1dB (approx.)
B
d=0.2m
R=5m
4