| 摘要 |
In displaying an antenna level on a display device, a bit error rate is measured by comparing, by a comparator, output signals of a QPSK demodulator and signals obtained by error-correcting those output signals by an error correction circuit and then again adding error correction codes to error-corrected data by a re-encoding circuit. The gain of an AGC amplifier is controlled in accordance with a measured value of the bit error rate, and an antenna value corresponding to the measured value of the bit error rate is displayed on the display device.
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