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Join Date: Mar 2015
Location: India
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Tuning in Radios

03/27/2015 11:46 AM

Why the capcitor is tuned instead of inductor in a radio, To receive the signal from the transmitter.

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#1

Re: Tuning in Radios

03/27/2015 12:15 PM

As a kid I made several radios where the tuning was done with the inductor.

Some modern radios tune by adjusting the divide-by-n counter in the digital section.

Some really modern radios just adjust the constants being fed into the DSP tuning routines.

Tuning is not always done with the capacitor.

Variable capacitor plates worked and never had problems with intermittent electrical connections while being turned. Thus, they are (or at least were) frequently a good choice.

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#2

Re: Tuning in Radios

03/29/2015 12:52 AM

You can find a variable inductor size and variable capacitor(variac) size. They are about 1:1000 in ratio. Since size complexity comes we prefer C than L.

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#3
In reply to #2

Re: Tuning in Radios

03/29/2015 8:54 AM

A Variac is a variable transformer, not a variable capacitor.

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#4

Re: Tuning in Radios

03/29/2015 1:58 PM

Actually most low power RF tuning nowadays is done by variable capacitance diodes (varicaps) where capacitance is controlled by the diode reverse voltage, requiring no moving parts, so your question is a few decades off. S.M.

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