| 摘要 |
A tuner can be switched between AM, FM, and stereo modes of reception without any radio or audio-frequency band-switching, and without any changes being made in the tuning meter connections. Separate AM and FM radio sections have power terminals which are alternately connected to a source of power by a single pole, double throw AM or FM selector switch. The audio outputs of the two radio sections are fed into a mixing amplifier, and the mixing amplifier output is fed to stereo demodulation circuitry. A single tuning meter is connected between the FM section audio output and the AM section automatic gain control.
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