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  • 1 Post By Terryl3

Rain attenuation and Solutions for it

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Old 12-17-2015, 08:33 PM   #1
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Default Rain attenuation and Solutions for it

What is Rain attenuation?
Rain attenuation, refers to attenuation caused when electromagnetic wave enters into rain layer, which includes the attenuation caused by rain drops absorption and scattering.

There are solution we can use as following:
Improve transmission power, increase transmission antenna area,using antenna with larger area, LNB and receiver with higher sensibility, Fine adjust the antenna El &AZ angle and LNB Pol. Angle to the optimum position.; add a rain-proof shed for protection if the antenna is installed outdoor.

To read the original article, please refer to Antesky webiste.
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Old 12-18-2015, 11:36 AM   #2
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The only thing that really worked for us broadcasters was to use a bigger dish.

At the cable TV head ends we used 20 to 30 foot diameter dishes on "C" band feeds, and 10 to 25 foot dishes for any "Ku" band feed, but the "C" band has less of a problem with rain fade due to the lower frequency's involved.

If you have rain fade problems with a consumer dish then go with a 1 meter size dish, or as large an elliptical dish as you can get for that location if useing multiple satellites/LNB's.

But with consumer grade LNB's and standard tuners on the FTA receivers all you can do is change the dish out to a larger size and use a higher grade of low loss coax rated out to 3 GHz.

For about every 3 inches of dish diameter increase over what you have now you will maybe gain about 2 to 3 dB of signal improvement on the "kU" band signals.

But don't expect miracles on "kU" band in sever weather, if there is a ton of rain up in that cloud your going to get a fade-out, 12 GHz signals do not like a ton of water vapor in the way
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Old 12-24-2015, 11:49 AM   #3
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Wait 15-20 minutes, it will probably blow over!
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Old 03-11-2018, 02:43 PM   #4
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Winegard makes larger (than Dish Network) dishes that you can put your Dish Network LNB[s] onto. They will increase your signal level dramatically. (I have one).
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