| 摘要 |
PURPOSE:To prevent deterioration in amplitude frequency characteristic near a pilot signal frequency by making a frequency in the pilot frequency band higher than the level of the basic band. CONSTITUTION:Transmission signals and pilot signals of microwave inputted from an antenna 1 are amplified and then band-restricted by a filter 3 to prevent interference with adjoining channels. The signals converted to signals of intermediate frequency band by a frequency converter 4 are band-restricted again by a filter 6 to prevent interference with adjoining channels. At this time, frequency characteristics near the pilot signal deteriorate. However, deterioration in amplitude frequency characteristic near the pilot signal is prevented by giving attenuation in the center frequency of intermediate frequency band to raise the level near the pilot signal frequency relatively by inputting an output of the filter 6 to a variable amplitude frequent equalizer 15. |
