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- W972961305 abstract "The best method to avoid fading in the shortwave is diversity reception. There are three versions of diversity reception—frequency diversity reception, spatial diversity reception, and polarization diversity reception. This chapter discusses all these methods. Frequency diversity reception is based on the differential fading of different shortwave frequencies. Spatial diversity reception depends on the movement of the wave from place to place as it fades. This is largely due to the ionosphere being unstable heightwise, and therefore, the signal walks about a bit. The polarity of the transcendental electromagnetic wave that forms the shortwave signal is messed up, to say the least. Despite as much as 30 dB difference between the vertical and horizontal polarization, it rarely matters on shortwave whether or not the polarity of the receiver antenna matches that of the transmitter antenna. The reason is that the polarity of the incoming signal keeps shifting and rotating. The IF/audio combiner might be a simple voting logic signal selector on the audio signal. It will select whichever of the two to five receivers is putting out the strongest signal, or if two or more are putting out equally strong signals, it will select according to a protocol. Another type of combiner operates at the IF frequency of the receivers. This combiner takes the signal and suppresses the carrier and one sideband, then reinserts a strong local carrier from an oscillator circuit. Still another method for the combiner is synchronous AM reception—an updated version of the Farnsworth or Crosley method." @default.
- W972961305 created "2016-06-24" @default.
- W972961305 creator A5060202923 @default.
- W972961305 date "2000-01-01" @default.
- W972961305 modified "2023-09-24" @default.
- W972961305 title "Diversity Reception Techniques" @default.
- W972961305 doi "https://doi.org/10.1016/b978-075067319-8/50020-3" @default.
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