The tuned circuit:
The three pronged thing at the top is the antenna (see here). The curly -wurly thing is the coil. The two opposed bars with the oblique arrow are the capacitor. The symbol at the bottom represents (the electrical connection to Mother) Earth, the place all electrons go when their work is done.
Radio signals are transmitted by alternating currents which flow in and out of the transmitting antenna. These currents produce electromagnetic waves which propagate far and wide, diminishing in power with distance. The waves reach the receiving antenna and induce an alternating current in it which is fed to the tuned circuit pictured above. The antenna receives all manner of waves of different frequencies. It is a bit promiscuous like that;)
The coil tends to resist high frequency alternating currents but allows to pass through the lower frequency currents. Capacitors pass high frequency alternating currents and resist those of lower frequency. A wonderful thing occurs when a coil and capacitor are simultaneously fed in parallel a mixture of alternating currents of various frequencies: All frequencies but one pass through the tuned circuit to earth and are lost. The tuned frequency is magnified in the same way that a crystal goblet or bell resonates when sung to at the right pitch. This magnified signal can then be decoded-see Part Three.
To adjust the tuned frequency, you can adjust the value of either the coil or the capacitor, (or both). The tuning knob on most radio sets adjusts the capacitor.
Coils are a bit Trad because they hate change. Capacitors are a bit Rad because they love change. To hear God’s broadcast in real time, one has to be both Trad and Rad simultaneously and tune and balance both tendencies until His Signal comes through loud and clear. I posit that a good Catholic possesses both tendencies but can vary them as required to hear the Holy Spirit addressing the age.
Yes, you’ve guessed it, I am a both-and person, not an either-or one.