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A satellite finder (or sat finder) is a satellite field strength meter used to accurately point satellite dishes at communications satellites in geostationary orbit. [ 14 ] [ 15 ] [ 16 ] Professional satellite finder meters allow better dish alignment and provide received signal parameter values as well.
The downlink satellite signal, quite weak after traveling the great distance (see path loss), is collected with a parabolic receiving dish, which reflects the weak signal to the dish's focal point. [11] Mounted on brackets at the dish's focal point is a device called a feedhorn or collector. [12]
In use, the RDF operator would first tune the receiver to the correct frequency, then manually turn the loop, either listening or watching an S meter to determine the direction of the null (the direction at which a given signal is weakest) of a long wave (LW) or medium wave (AM) broadcast beacon or station (listening for the null is easier than ...
DISH Network L.L.C., often referred to as DISH, an abbreviation for Digital Sky Highway, [1] is an American provider of satellite television and IPTV services and wholly owned subsidiary of EchoStar Corporation.
Local channels in most major cities were available as digital broadcasts over DISH Network using Super Dish, but HDTV has since been moved to the 61.5 and 129 satellites. In 2007, most of the services at the 121° location were moved to the Anik F3 satellite at the 118.75° location.
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The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish. The main advantage of a parabolic antenna is that it has high directivity . It functions similarly to a searchlight or flashlight reflector to direct radio waves in a narrow beam, or receive radio waves from one particular direction only.
A modulated signal is a sequence of symbols, pieces of data represented by a corresponding signal state, e.g. a bit or a few bits, depending upon the modulation scheme being used. Recovering a symbol clock (making a local symbol clock generator synchronous with the remote one) is one of the most important tasks of a demodulator.
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