| 摘要 |
PURPOSE:To measure a carrier wave power/noise power ratio (C/N), by calculating the power ratio of outputs of two filters different in a pass band width. CONSTITUTION:The band width B2 of second BPF3 is set narrowly in a range imparting no strain to a passing signal component and the band width B1 of first BPF2 is set in a range receiving no influence of the other signal so as to be made wider than the band width B2. Then, an input signal 1 is allowed to pass through first BPF2 and only the noise of the input signal 1 receives band restriction. The output signal 5 of first BPF2 passes through second BPF3 and only the noise of the signal 5 receives band restriction. Next, powers of the output signal 5 of first BPF2 and the output signal 4 of second BPF3 are respectively measured by power measuring instruments 6, 7 and measured values 8, 9 are guided to a C/N operation circuit 10 to receive operation.
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