Station selecting apparatus

H - Electricity – 04 – B

Patent

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Details

325/111

H04B 1/26 (2006.01) H03D 7/16 (2006.01) H03J 7/06 (2006.01)

Patent

CA 2020387

A station selecting apparatus has a first mixer and a first local oscillation circuit for frequency converting the input signals (television signals) into a first intermediate frequency signal. A second mixer and a second local oscillation circuit convert the first intermediate frequency signal into a second intermediate frequency signal. A variable voltage device capable of varying a direct current fixed voltage in stages provides a signal for controlling the second local oscillator. The minimum potential width of the direct current voltage is set so that the frequency displacement (unit variation amount) of the second local oscillator obtained by the potential difference is smaller than the frequency resolution of the first local oscillator.

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