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Masthead Amplifiers
Masthead Amplifiers (sometimes called Pre-Amplifiers) are usually used with aerials and, as the name suggests, can be placed on the aerial mast (although this does not have to be the case) to this end they are contained in waterproof boxes. A masthead amplifier is designed to enhance the signal at its strongest point, which is close to the aerial.
Some Masthead Amplifiers have a static fixed gain and others have a variable gain. they usually come with their own separate power supply, but sometime they can be powered by some distribution amplifiers.
Masthead amplifiers usually come either with one output (1 way) or 4 outputs (4 way).
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