| 摘要 |
PURPOSE:To enable to easily install separately the high frequency part and the MODEM part, by using optical fibers for the transmission of IF signal between the high frequency and MODEM part. CONSTITUTION:The micro wave reception signal inputted to the reception antenna 11 is rejected for unnecessary components with the band pass filter 12, and fed to one input of the frequency converter 14 after EF amplification 13 and mixed with the signal from the reception local oscillator 15 fed to another input. The IF signal developed at the output of the converter 14 is fed to the light emitting element 17 after amplification 16 and electric-photo conversion is made. The light output developed is transmitted via the optecal fiber 18, it is hohto-electric converted at the photo detection element 19 to cause electric IF signal again. It is FM demodulated at the demodulator 21 and outputted from the terminal 22 after IF amplification 20. On the other hand, the modulation input inputted from the terminal 31 is fed to the modulator 32 and transmitted from the transmission antenna 42 via inverse path, after rejecting unnecessary components at the band pass filter 41. |
