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A magic tee (or magic T or hybrid tee) is a hybrid or 3 dB coupler used in microwave systems. [1] It is an alternative to the rat-race coupler. In contrast to the rat-race, the three-dimensional structure of the magic tee makes it less readily constructed in planar technologies such as microstrip or stripline.
Rat-race couplers are used to sum two in-phase combined signals with essentially no loss or to equally split an input signal with no resultant phase difference between its outputs. It is also possible to configure the coupler as a 180 degree phase-shifted output divider or to sum two 180 degree phase-shifted combined signals with almost no loss.
Twin turntables were illustrated in the BBC Handbook in 1929, and were advertised for sale in Gramophone magazine in 1931. [3] There was an obvious need for such a setup when the normal music format was 78rpm records that played for five minutes at most and a classical symphony came in a box which might contain ten discs or more.
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