JRC JUE-95SA - Reference: Estimation Methods of RX;TX Signal Loss by Physical Obstructions

4-5
4
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; R (m)
ii) Estimate the effective diameter (d) of the obstacle; d (m)
iii) Read off the loss (L
B
) in the Chart I; L
B
(dB)
iv) Determine whether the loss (L
B
) is allowable.
Chart 4.4.4b The Loss Due to cylindrical obstacle
d=0.2m
Pole
or
Mast
R=5m
Example
i) R:5
ii) d:02m
iii) L
B
:1dB (approx.)
iv) Allowable
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.
NOTE