| 摘要 |
PURPOSE:To save the packing space as well as to simplify the circuit constitution by providing the variable frequency socillator to each circuit for the sharing purpose in the repeating installation in which the carrier is inserted again via the carrier inserting oscillator when the reception level lowers less than the prescribed level. CONSTITUTION:The multi-frequency signals received through antenna 8 are amplified by receiver 1, 1' and 1'' of each circuit and then applied to circulator 4 via switch 2. And the transmission frequency which is deviated by the deviation frequency compared with the reception frequency via the output of deviation frequency oscillator 6 is obtained at diviation frequency converter 5 to be transmitted through antenna 9 and via transmitter 7, 7' and 7''. At the same time, when the reception level lowers less than the prescribed level, the output of carrier inserting oscillator 10, which can vary the frequency of oscillator 12 to the prescribed frequency of each circuit via controller 11, is switched by switch 2 and then applied to circulator 4 to be then supplied to transmitter 7, 7' and 7'' each in the form of the transmission frequency. |
