What type of oscillators are used to input a wide range of frequencies to the IF amplifier?

What type of oscillators are used to input a wide range of frequencies to the IF amplifier? Correct Answer Variable frequency oscillators

The local oscillator is usually a variable frequency oscillator or a frequency synthesizer so that its frequency can be adjusted over a relatively wide range. As the local-oscillator frequency is changed, the mixer translates a wide range of input frequencies to the fixed IF.
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