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emission system for radio station type vor station using conventional and radio navigation system
emission system for radio station type vor station using conventional and radio navigation system
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机译:使用常规和无线电导航系统的无线电台类型vor站的发射系统
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摘要
A generator (200) containing a clock (2) and a delay circuit (5), to provide a phase shift for the clock output, generates the sideband signals for a sample of a carrier (P). These signals are applied to a hybrid ring (7) which separates the upper (S1) and lower (S2) sideband signals. Frequency and phase comparators (11,12) allow the sideband signals to be compared with amplified (41,42) outputs of respective voltage controlled oscillators (31,32). This ensures that the upper and lower sideband signals are phase locked and do not contain the carrier or the other sideband frequencies. Low pass filters (21,22) remove harmonics of the modulating frequency. A second hybrid ring (13) recombines signals to provide the two sidebands (Bs,Bc).
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