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Article

О возможности одновременного усиления нескольких телевизионных каналов широкополосной мощной ЛБВ

Андреевская Т. М.

The possibilities of use as the output stage television transmitter traveling wave tube to amplify simultaneously several television channels. TWT has a wide bandwidth and a high gain. The simulation of the transformation of multi-frequency signals, including a lest of the television signal. The method of analysis — a quasistationary. Lamp determined by its amplitude and fazo-amplitude external characteristics. The case of sufficiently smooth characteristics that can be approximated by a polynomial of low degree. For a given bandwidth requirements for high-frequency signal and intermodulafion interference investigated for optimal arrangement of three to six TV channels in a given band TWT. We also consider the effect of the phase of each channel at the level of the Raman background.
It is shown that the use of the phase shifter on the even (or odd) channels to reduce intermodulation background caused by combination up to 5 dB at the same total power. The calculations of the nonlinear interaction of the six channels, received frequency and levels of combinational components with different capacities and placement of frequency channels. We give conditions for selection of the total input power TWT in which intermodulation interference is less than the level specified by the standard.