| 摘要 |
PROBLEM TO BE SOLVED: To easily confirm a reception level. SOLUTION: A mixer 5 mixes a high frequency signal outputted from an RF amplifier 3 with a local oscillation wave outputted from a frequency synthesizer 4. An intermediate frequency amplifier 7 amplifies an intermediate frequency signal from a band pass filter 6. A reception level detection circuit 8 detects an output level of the intermediate frequency amplifier 7, that is, a reception level and generates a drive signal so that a luminous intensity of a light emitting element 9 is proportional to the detected reception level. Thus, the light emitting element 9 emits a light with the luminous intensity in response to the strength of the reception level.
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