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- W246167033 abstract "The C.C.I. specifications for the signal/noise ratio of microwave relay systems set an upper limit for the noise of travelling-wave tubes used in such a system.It is shown that two noise components of the travelling-wave tube, namely the background noise and the frequency-modulation noise, affect the signal/noise ratio of the relay system. Background noise is the conventional type of tube noise and is represented by the noise figure. The frequency-modulation noise is a frequency modulation of the carrier by noise and is characterized by its relation to the r.m.s. value of the frequency deviation. Ion oscillation present in travelling-wave tubes with poor vacuum will also cause frequency modulation.Techniques for the measurement of the noise components are described in the paper. The results of measurements on several travelling-wave tubes are compared with the upper limits specified for noise components in a relay system." @default.
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- W246167033 date "1958-05-01" @default.
- W246167033 modified "2023-09-27" @default.
- W246167033 title "Frequency noise in travelling-wave tubes" @default.
- W246167033 doi "https://doi.org/10.1049/pi-b-1.1958.0180" @default.
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