polarization selector

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Multiplexer — This article is about electronic switching. For telecommunications, see multiplexing. Schematic of a 2 to 1 Multiplexer. It can be equated to a controlled switch … Wikipedia
Majestic 12 — This article is about the purported secret committee called Majestic 12 . For other uses, see Majestic 12 (disambiguation). The 1947 letter, purported to be signed by Harry Truman, authorizing Operation Majestic Twelve . Majestic 12 (also known… … Wikipedia
Cellular network — Top of a cellular radio tower A cellular network is a radio network distributed over land areas called cells, each served by at least one fixed location transceiver known as a cell site or base station. When joined together these cells provide… … Wikipedia

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