| 摘要 |
PURPOSE:To attain the bidirectional transmission signal without use of a bidirectional amplifier by connecting a transmission line of the head end and tailend in a loop via a unidirectional amplifier. CONSTITUTION:A receiving signal of an antenna 1 is amplified or frequency- converted/amplified at the head end 2 and transmitted to a transmission line 3 as the 1st signal, and after the signal is amplified at some stages by plural unidirectional amplifiers 10, the signal is fed back to the head end 2, and a receiver 9A can receive a signal during this processing. On the other hand, the 2nd signal having a frequency band oscillated from a transmitter 9B is fed to a line 3 via a branching transmission line 8 and a branching device 7, amplified at the amplifiers 10, and transmitted in the same direction as the 1st signal and reaches the end 2. since the 2nd signal is converted into a frequency in the same frequency band as the 1st signal and transmitted similarly as the 1st signal at the end 2, the 2nd signal is received by all the receivers 9A. |
