| 摘要 |
PURPOSE:To improve easy operation of a monitor and control equipment for transmission wave with a simple constitution, by using the same spectrum analyzer to attain the spectrum analyzing functions for both monitor and control of effective radiation power and for a reducing device for distortion of mutual modulation with a transmission system which amplifies in common plural transmission waves. CONSTITUTION:A spectrum analyzer 11 sweeps the area within a transmission frequency band and analyzes it to plural transmission waves themselves as well as the mutual modulation distortions due to those waves. Then the analyzer 11 analyzes the amplitude of each spectrum, and the amplitude data on the transmission wave itself is impressed to a gain variable amplifier 12. The amplifier 12 performs the automatic control based on said amplitude data so that the effective transmission power is set at a prescribed level. While the amplitude data on the mutual modulation distortions is impressed to a mutual modulation distortion reducing device 13. Then the device 13 performs the automatic control so as to reduce the mutual modulation distortions based on said amplitude data. |
