| 摘要 |
PURPOSE:To make the combining reception for multiple diversity, by combining organically constitutions for double diversity without changing them practically. CONSTITUTION:Input signals, which are controlled to certain levels, on paths A and B are applied to input terminals 1 and 2 respectively. Controlling signals of paths A and B applied to input terminals 3 and 4 are proportional to S/N of signals inputted to terminals 1 and 2. Output signal levels of variable gain amplifiers 12 and 13 are detected by an AGC amplifier 14, and the detection voltage of a route having a higher level out of paths A and B is amplified and is applied as an AGC control voltage to amplifiers 12 and 13. a Combiner 11 combines signals of terminals 1 and 2 in the same phase and in an optimum ratio in accordance with output signal levels of amplifiers 12 and 13 and outputs the result to a terminal 5. A variable attenuator 18 attenuates the output of a signal generator 17 to output the output to a terminal 6. A variable gain amplifier 15 is controlled by the output of the amplifier 14 to amplify the output of the attenuator 18, and an AGC amplifier 16 detects the output signal level of the amplifier 15 and amplifies the DC to give the SGC control voltage to the attenuator 18. |
