How does a TV tune its frequency?

Thread Starter

davidGG

Joined Dec 22, 2012
51
I've experimented with radios and the only way to change the frequency is by tuning the tank circuit which is either by varying the capacitor or inductor.

How does a TV do this when I change the channel with a remote? Is there some sort of rotating part in the TV?
 

MrChips

Joined Oct 2, 2009
30,708
The frequency generation part of the local oscillator is tuned using phase-locked loop and frequency division.

The tank circuit is tuned using varactor diodes.
 
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