| 摘要 |
PURPOSE:To prevent the generation of mutual modulation between an antenna signal and an output signal of an RF modulator by making the direction of the antenna signal in a signal line and the direction of a modulator signal at a coupling section identical. CONSTITUTION:An antenna signal is distributed to an output section 4 to a tuner in a VTR and a booster mixer 15 by a distributer 3. The booster mixer 15 has an RF amplifier 6 and a mixer 17. A direction A of the antenna signal path in the signal line 17a and a direction V of an output path from the RF modulator 9 at a coupling section 17b are directed the same in the mixer 17. Even when the antenna input signal with a large level is given in the VTR reproducing mode, the antenna signal is inputted to the coupling section 17b while being attenuated largely. Thus, the beat of a picture due to the mutual modulation between the antenna signal and the output signal of the RF modulator 9 in not caused.
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