Rain fade refers primarily to the absorption of a microwave radio frequency (RF) signal by atmospheric rain, snow or ice, and losses are especially prevalent at frequencies above 11 GHz. It also refers to the degradation of a signal caused by the electromagnetic interference of the leading edge of a storm front. Rain fade can be caused by precipitation at the uplink or downlink location. However, it does not need to be raining at a location for it to be affected by rain fade, as the signal may pass through precipitation many miles away, especially if the satellite dish has a low look angle. From 5 to 20 percent of rain fade or satellite signal attenuation may also be caused by rain, snow or ice on the uplink or downlink antenna reflector, radome or feed horn.
Possible ways to overcome the effects of rain fade are site diversity, uplink power control, variable rate encoding, receiving antennas larger than the requested size for normal weather conditions, and hydrophobic coatings. Only superhydrophobic, Lotus effect surfaces repel snow and ice.
Read more about Rain Fade: Uplink Power Control, Parallel Fail-over Links, CCIR Interpolation Formula, ITU-R Frequency Scaling Formula
Other articles related to "rain, rain fade, fade":
... Especially at frequencies higher than 10 GHz in heavy rain fall areas, a noticeable degradation occurs, due to the problems caused by and proportional to the amount of rainfall (commonly known as "rain fade ... the satellite network, and allocating a higher power consumption to compensate rain fade loss ... A similar phenomenon, called "snow fade" (where snow or ice accumulation significantly alters the focal point of a dish) can also occur during winter precipitation ...
... moisture and various forms of precipitation (such as rain or snow) in the signal path between end users or ground stations and the satellite being utilized ... This interference with the signal is known as rain fade ... services in tropical areas with heavy rain, use of the C band (4/6 GHz) with a circular polarisation satellite is popular ...
... According to the ITU-R, rain attenuation statistics can be scaled in frequency in the range 7 to 55 GHz by the formula where and f is the frequency in GHz ...
Famous quotes containing the words fade and/or rain:
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