4-5
4
Fig.4-4-4a EME Installation against cylindrical obstacle
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 4-4-4a (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 4-4-4a; L
B
(dB)
iv) Determine whether the loss (L
B
) is allowable.
Chart 4-4-4a The loss due to cylindrical obstacle
Example
i) R:5
ii) d:02m
iii) L
B
:1dB (approx.)
iv) Allowable
*Under lower elevation angle area, sometimes the communication might be impossible due to fading
or weather condition.
NOTE
d=0.2m
Pole
or
Mast
R=5m
Summary of Contents for JUE-95LT -
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Page 21: ...2 5 2 2 2 3 Coaxial cable CFQ 5924A3 Fig 2 2 3 Coaxial Cable...
Page 25: ...2 9 2 2 4 2 EME NAF 253LT Fig 2 4 2 EME NAF 253LT Unit mm Mass Approx 2 4 kg Color N9...
Page 26: ...2 10 2 4 3 IME NTF 782LT Fig 2 4 3 IME Unit mm Mass Approx 1 3kg LT LT LT LT LT...
Page 29: ...2 13 2 2 5 2 EXT PSU NBD 843A Fig 2 5 2 EXT PSU NBD 843A Unit mm Mass Approx 8kg...
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