A television signal transmitter has an up-converter provided with a pre-amplifier and an impedance matching circuit subsequent to the pre-amplifier. The self-resonance frequency of an inductor included in the impedance matching circuit, which is connected in series to a signal line, is set to a parasitic oscillation frequency (5 GHz) of the pre-amplifier. The self-resonance frequency of an inductor of a filter provided prior to the pre-amplifier, which is connected in series to the signal line, is set to the parasitic oscillation frequency (5 GHz) of the pre-amplifier.
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