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Topic: Rain fade

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	Rain fade - Wikipedia, the free encyclopedia
		In satellite communications, rain fade refers to the absorption of a microwave Radio Frequency (RF) signal by rain or snow, and is especially prevalent in frequencies above 11 GHz.
		From 5 to 20 percent of rain fade or satellite signal attenuation may also be caused by rain, snow or ice on the downlink antenna reflector, radome or feed horn.
		Possible ways to overcome rain fade are site diversity, uplink power control, variable rate encoding, receiving antennas larger than the requested size for normal weather conditions, and super hydrophobic rain, snow and ice repellent coatings.
	en.wikipedia.org /wiki/Rain_fade (202 words)

	Rain Attenuation on Ku-Band and C-Band Satellite Transmissions (Site not responding. Last check: 2007-10-19)
		The rain fade margin is the amount of extra power Telesat adds to the signal strength to compensate for the possibility of rain attenuation.
		Terrestrial microwave transmissions are more susceptible to the effects of rain attenuation because their signal paths are entirely in the troposphere, and the signal may pass through an entire rain cell.
		The rain fade margin is a component of the link margin, and is a calculation of expected rain attenuation over one year.
	www.telesat.ca /satellites/transmissions/rain-attenuation.htm (901 words)

	Rain Fade
		Rain fade is one of the most common, and often most misunderstood, phenomena to affect satellite signals.
		Rain outage will only occur during the heaviest rains (convective and stratiform are the most predominant types) with only a small portion of the transmission path experiencing attenuation.
		Rain fade seems to correlate very closely with the volume of raindrops (expressed in cubic wavelengths) along the path of propagation.
	www.spacecom.com /customer_tools/html/body_rain_fade.htm (512 words)

	Satellite TV rain fade signal loss outage? Reduce attenuation, snow, ice buildup with super hydrophobic dish & radome ...
		This loss of signal at the receiving antenna contributes 5-20% to what is commonly referred to as rain fade or rain attenuation.
		Weather induced rain fade problems are the number 1 complaint of satellite television subscribers (Consumer Reports, November 2005).
		WX2100 is a long-lasting, super hydrophobic coating that repels rain, snow and ice, keeping satellite dishes and radomes dry even in heavy precipitation and preventing the buildup of snow and ice.
	www.wx2100.com (157 words)

	Satellite Footprints by Dish Size - Noise Discussion, Terrestrial Interference (TI), Rain Fade, Free Space Loss, Earth ...
		Since rain only forms in the troposphere, which extends seven miles above the earth, and satellites in geostationary orbit are 35,800 km above the earth, a signal travelling through a rain cell will experience attenuation during only a small portion of its transmission path.
		For C-band it is not as critical, in regards to Ku-band, however, the diameter of a rain drop is definitely detrimental to passage of Ku/Ka-band signals.
		Rain fade does not cause noise to enter your system but it does prevent signal from being as strong as you may require.
	www.geo-orbit.org /sizepgs/Noise.html (4779 words)

	WX2100 significantly reduces weather-related satellite TV reception problems. - Cytonix
		Rain, snow and ice covering a satellite dish contribute to interruptions of TV reception.
		Together with atmospheric precipitation, this loss of signal is commonly referred to as “rain fade”.
		In heavy rain, a film of water can accumulate on the satellite dish resulting in poor video, loss of color and/or sound and in some cases the picture may drop out all together.
	www.prleap.com /pr/37051 (453 words)

	7 Years of ACTS Technology Verification Experiments
		As the dominant cause for signal impairment, rain attenuation is a function of frequency, elevation angle, rain intensity, raindrop size distribution, and raindrop temperature.
		Fades of 20 dB or larger were observed at least 0.1 percent of the time in subtropical rain zones and 0.01 percent of the time in a dry rain zone.
		Selecting a subtropical rain zone (Cocoa, Florida) and using a tipping bucket rain gauge to collect rainfall data over a 10-month period, Glenn’s researchers conducted the Wet Antenna Experiment to analyze the contribution that a wet feed and wet reflector antenna have on the signal path losses at Ka-band frequencies.
	www.grc.nasa.gov /WWW/RT1999/6000/6100acosta.html (830 words)

	HW5 ECpE 5656 (Site not responding. Last check: 2007-10-19)
		In the problems which follow, rain fade margins will be analyzed to determine the availability of the system under conditions of rain on the uplinks and rain on the downlinks.
		The rain fade margin on the inbound downlink.
		Start with the fade margin value you found for the inbound uplink in Question #1, and determine the operating point of the transponder, by establishing the input back off in the uplink rain fade.
	www.ee.vt.edu /~ee5656/hw5.htm (1345 words)

	King Controls: rain shield
		This loss of signal is commonly referred to as “rain fade” or signal attenuation.
		In many cases, the loss of signal strength due to rain is not more than the rain fade margin, so you can still be watching TV when it rains.
		You lose picture when there is enough water in the atmosphere to completely block the signal, or more likely when the signal loss caused by a combination of water in the atmosphere and water on the dish and LNB exceed the rain fade margin.
	www.kingcontrols.com /Template.asp?page=rain+shield (526 words)

	Current and past projects on systems analyses, designs and concepts \| CRC
		At 30/20 GHz, rain attenuation is severe and the provision of a simple power margin at the terminal and spacecraft is very inefficient to maintain a given link availability.
		Statistical analysis of the data showed that rain fade event can be detected with a low false alarm probability and the fade depth estimated to within one (1) dB at worst.
		Given the large rain attenuation at 30/20 GHz, there exists an optimum orbit location for a given coverage area where the required rain margin for maintaining a link availability is the most uniform.
	www.crc.ca /en/html/rss/home/projects/systems?pfon=yes (859 words)

	Rain fade on PBS - SatelliteGuys.US
		Yes Ku band is always susecptible to rain fade and rain fade can happen even when it's not raining directly on your area.
		I'm guessing the reason you ask this question is you've seen those products which claim to help prevent rain fade by preventing water from sticking to the dish.
		Of course there is signal fade caused by big BLACK clouds and Rain Shield will NOT help with that, but water droplets on the dish do indeed fragment the signal.
	www.satelliteguys.us /showthread.php?t=51202 (838 words)

	DBSTalk.Com - Rain Fade
		Signal fade is nothing to worry about, but if you're really worried about it, you should ask your dealer about a dish cover.
		Having a rain fade event when Hercule Poirot is about to reveal the killer always seems like it's hours long.
		But just to bring some perspective to the situation, after my 30 minute rain fade event, I was able to watch TV again.
	www.dbstalk.com /printthread.php?t=5695 (1568 words)

	Influence of time interval and filter bandwidth on measured rain fade slope
		The rate of change of rain attenuation, or ‘fade slope,’ observed on a microwave link, is dependant on system parameters of the receiver.
		This paper assesses its dependence on two data processing parameters: the time interval over which the fade slope is defined, and the low-pass filter bandwidth used to remove tropospheric scintillation.
		In general, the fade slope always depends strongly on at least one of the two parameters.
	www.agu.org /pubs/crossref/2004/2002RS002837.shtml (231 words)

	Satellite Rain Fade - ABC Reception Advice
		You may experience satellite rain fade if you receive ABC TV via a home satellite dish, or if part of the signal transmission path from the ABC studio to your antenna uses a satellite link.
		Rain fade is characterised by ‘pixellation’ of the picture, where the image breaks into blocks.
		Unfortunately there is little that can be done to aviod rain fade, however the disruption to reception should be temporary.
	www.abc.net.au /reception/tv/sat_rainfade.htm (231 words)

	Superdish Rain Fade? - SatelliteGuys.US
		Compared with the Dish500 rain fade will probably be less for the circularly polarized lnb's at 110 and 119.
		I have known lower powered satellites to have less rain fade in the past, such as Primestar and C-Band where people have said that they had less problems with rain fade with those satellites than with Dish or Direct.
		C band frequencies are much less susceptible to rain fade than are Ku bands.
	www.satelliteguys.us /showthread.php?t=197 (756 words)

	Rain Fade Dish Kits - HDTV Phase 3 - Wave Frontier
		Get the 24 inch Rain Fade Dish Anodized, powder coated, steel constructed 5 year warranty rain dish kit that will give you 2.5 db.
		Rain fade problems or losing signals on your single satellite?
		Reflectors are finished with Thermo Set Powder Coat - A Hydrophobic Agent is added to the finish to increase water and snow repellant action - Mounts are manufactured from Galvanized Steel and E coated for maximum protection - Feed support systems clamp to preformed satellites 101W-110W-119W degree Birds- Average overall gain through 10.7-12.75 Ghz.
	www.criscros.net /Rain_fade_dish.html (402 words)

	hydrophobic coating, radome, antenna, dish, rain fade attenuation, Fluorothane, WX2100
		Operational values during the rainiest periods are typically 5 inches of rain per hour at intermittent wind speeds of 15 meters per second.
		An apparatus for simulating heavy rain was developed to produce 10 to 60 inches of rain per hour with impact speeds of 25 to 45 meters per second and drop sizes statistically conforming to the Army data.
		The scattered droplets have a drop size distribution similar to heavy rain, reaching the test panels at a rate of 10 inches per hour.
	www.cytonix.com /coatingdata.html (747 words)

	KING DOME RAIN FADE SOLUTION 1830
		With home satellite dishes, the loss of signal strength due to rain is usually not more than the rain fade margin, so you can still be watching TV when it rains.
		This occurs when there is enough water in the atmosphere to completely block the signal, or more likely when the signal loss caused by the combination of water in the atmosphere and water on the dish and LNB or dome exceed the rain fade margin.
		Dome Magic eliminates the negative effects of rain and dew on the dome.
	store.wmjmarine.com /c16975.html (485 words)

	Rain Fade - DBSTalk.Com
		If you get a good signal on a clear day (80 or higher), rain fade will only happen in the most severe storms or when there is a VERY thick cloud layer between you and the satellite.
		I get rain fade an averge of 3 times per year and snow fade once per winter, with exception of this past winter when I got it twice.
		Another way to avoid rain fade is to install a larger dish.
	www.dbstalk.com /showthread.php?p=38116 (1601 words)

	Home Theater Spot: Gainmaster Dish and Rain Fade? (Site not responding. Last check: 2007-10-19)
		I'm able to keep the signal during moderate rain (moderate is a relative term when you live in Florida) with the Gainmaster that would knock out the signal with the regular triple LNB dish.
		Maybe dish aiming is contributing to the rain fade resistance, but I believe the Gainmaster is better.
		Bottom line in my opinion is that in the deep south, nothing short of a 10-meter dish is going to keep rain fade at bay 100% during the cloudbursts we sometimes experience.
	www.hometheaterspot.com /htsthreads/showflat.php?Number=613029 (965 words)

	rain fade question - High Def Forum - Your High Definition Community & High Definition Resource
		I have had both up during rain (why is a long story) and the triple LNB woud lose signal where the old single LNB did not.
		Two - If you are picking up an HD signal OTA from a local station you are using the UHF band (200-400 MHz) which is much less vulnerable to rain fades that a satellite downlink that works at 12 GHZ.
		I live in Wash. DC and have never experienced a rain fade on an OTA channel.
	www.highdefforum.com /showthread.php?t=10876 (758 words)

	New H20, bad rain fade problem - High Def Forum - Your High Definition Community & High Definition Resource
		The three storms that I have had in my neighborhood were light rains--not big thundercouds and such, and certainly not torrential rains.
		From listening to them explain the process it is the signal strength outside that is of greatest concern because they expect to drop the signal down once it gets to the filter on the back side of the receiver.
		The tech also said that my rain fade may improve with time with stronger satellites coming online.
	www.highdefforum.com /showthread.php?p=156934#post156934 (456 words)

	Rain Fade Solution - Digital Forum
		If you live on the west coast of BC, the 20 inch dish is too small for the rain we get, especially on the 82`sat.
		I have two 24 inch dishes and have next to no rain fade.
		I've never had rain fade (in 3 years of service) on with 20 inch dish in Victoria.
	www.digitalhome.ca /forum/showthread.php?t=26705 (721 words)

	Rain Fade - Compare Prices, Reviews and Buy at NexTag - Price - Review
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		The Sun's rays can be your vehicles most persistant enemy.
		Made with fade-resistant Dupont SolarMax - Spinner can withstand daily UV rays, rain and snow - All installation hardware included Add a splash of color to your outdoor decor with...
	www.nextag.com /rain-fade/search-html (407 words)

	Dish swap to reduce rain fade - Digital Forum
		Seem to be getting more and more rain fade this year (I'm in Edmonton), to the point where I'm seriously considering a dish swap.
		But I can't see them taking away the one objection that most cable cos were saying as a reason to not get satellite; that being rain fade.
		Whereas now most times rain fade affects your viewing for maybe an hour at a time.
	www.digitalhome.ca /forum/showthread.php?p=398884#post398884 (1130 words)

	Waugh's WC hopes fade in rain
		Waugh was dropped from the one-day side in February and replaced as captain by Ricky Ponting, then left out of a preliminary 30-man World Cup squad announced by selectors last week.
		The 37-year-old was to captain New South Wales in a 40-overs-a-side practice match against Australia in Sydney on Tuesday, but heavy rain overnight and in the morning forced officials to cancel the fixture.
		The match was Waugh's last real chance to press his claims for selection before the final 15-man World Cup squad is named on December 31.
	www.rediff.com /wc2003/2002/dec/10steve.htm (219 words)

	An inexpensive rain fade countermeasure technique for DA-TDMA satellite systems - Celandroni, Potorti', Rizzo ... (Site not responding. Last check: 2007-10-19)
		Abstract: Rain attenuation countermeasure systems for geostationary satellite transmissions have been proposed that use a variety of methods.
		This paper presents a technique which only requires a burst modem that is able to vary its bit and coding rate on a sub-burst basis coupled with a convolutional encoder/Viterbi decoder.
		A complete method for predicting the attenuation at the receive time is described for two different DA-TDMA systems, using centralised and distributed control, respectively.
	citeseer.ist.psu.edu /482498.html (368 words)

	rain fade - a Whatis.com definition
		Rain fade is an interruption of wireless communication signals as a result of rain or snow droplets whose separation approximates the signal wavelengths.
		The phenomenon can affect satellite Internet connections as well as satellite television and other systems.
		Find white papers, products and vendors related to rain fade.
	whatis.techtarget.com /gDefinition/0,294236,sid44_gci529672,00.html (239 words)

	TPA Software - More Fades
		Right-click on the Fade Scheme link you would like to download.
		Select either your Fade-It folder if you are using Fade-it or your WavMan folder if you are using WavMan.
		Once the file has finished downloading click the Refresh button on the Fade Designer/Control Panel window to load the new Fade Scheme.
	www.tpasoft.com /fades/1.html (110 words)

	REDUCE RAIN FADE SIGNAL ATTENUATION LOSS OUTAGE, SNOW, ICE BUILDUP WITH SUPER HYDROPHOBIC SATELLITE TV DISH & ...
		Keywords: rain fade, TV signal loss, super hydrophobic, superhydrophobic, super-hydrophobic coating, satellite dish, radome, Ku Band, Ka Band.
		Fluorothane MW applied to microwave dishes and radomes may be expected to remain superhydrophobic for 10 years or more.
		The coating is rain resistant after 6 hours, substantially cures in 24 hours and is fully cured in 5 to 10 days.
	www.cytonix.com /wx2100.html (900 words)

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