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Air variable capacitors

Jimmyz

Feb 23, 2022
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Feb 23, 2022
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Hello. based on what i see. Air variable capacitors no longer seem to be used in radios. what electronic component has replaced them? Thanks
 

Harald Kapp

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Nov 17, 2011
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Nov 17, 2011
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FIrst varactors (also called varicaps) were used.
Today tuning is mostly done digitally, eg. by synthesizing the local oscillator signal for a superhet's mixer.
Or completely in the digital domain by undersampling (look up SDR - software defined radio).
 
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