Rain effect on microvave link

[laucinieks]

Wanted to ask is it possible in ICS telecom to calculate how rain effects microwave link. if yes, can rain broke link and if yes how could i tell if so.
i hope someone will get my idea.

[zeuscane]

The answer is Yes

Please read this document.

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regards
zeuscane

[laucinieks]

Can't read because reputation too small :)
maybe can send to my email janisgr@gmail.com or post another link

[zeuscane]

Sent by email

regards
zeuscane

Can't read because reputation too small :)
maybe can send to my email janisgr@gmail.com or post another link

[laucinieks]

One more question
microwave link is broken when i set rain precipitation (mm/h) so big that path reliability isnt as big as it needed to expect, right?

[lynt123]

depending on the frequency band in use rain will attennuate the signal by a certain amount of DB per CM squared. here is the formula for what its worth Ap = A001 0.12 p−(0.546 − 0.0043 log10 p). Ap is the loss in dbm. I should also mention that the lower the freq the less rain has an effect. although rain effects all bands the higher the freq the more noticable the effect.

in plain language a fog will chop about 3db, light rain 5 db, moderate rain 7 db, heavy rain 10 db, time to build an ark 12+ db usually its the 12+ db that causes loss of signal. Of corse it also depends on how far you are from the source but generally you can use the above guide as a rule of thumb.

the picture below illustrates the general efffect

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and here is a generalised chart of a typical attenuation curve.

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[laucinieks]

i can't see those picture either because my rep is too small maybe you can send pictures to my email

[lynt123]

the first picture is just a representation of 2 sites and the signal streangth between the transmitter and the reciever. The second is a graph showing the attenuation typacally seen based on the rain density and the area of the rain in the path.

If i get time ill copy and email them for you.