| 摘要 |
PURPOSE:To receive a signal with lower level, by eliminating the level difference after AGC to a number of wave signals. CONSTITUTION:An amplitude limiter 10 decides the upper limit of the signal amplitude passing through a band pass filter 9, and this is done by a saturation amplifier such as differential amplifier, which acts as an amplifier to a low level signal and saturates to a high level signal to be limited to a given level. A plurality of signals level-limited with amplitude limiters V1-Vn corresponding to band pass filters F1-Fn, are synthesized at a synthesis circuit 11 and transmitted to a transmission section. Modulation is made at the section, but since the signal level is arranged for each signal with the amplitude limiters V1-Vn, uniform phase modulation is made to each signal and transmission is made to the earth with the teansmission antenna section. |
