Pages: (1) (2) (3) (4) (5) (6) (7) (8) Modulation page // Oscillator Page

(continued from <-- Page Three)

If you can, please go to the wide screen edition of this page for a much clearer, bigger diagram. That page has the same text as this one and you can continue this discussion from there.

<---Continued from page three

By the way, that second frequency is made by a circuit called a local oscillator; local because the signal is made right in your rig as opposed to the incoming signal which comes from tens, hundreds, or even thousands of miles away. It's also an oscillator because electricity oscillates back and forth in this circuit. It goes back and forth so fast that it becomes a radio frequency.

So, now we have a much slower signal coming out of the mixer, at usually 455 thousand cycles a second. Once again we kick up the voltage by running this frequency through an I.F. (intermediate frequency) amplifier, which also purifies the signal and selects just the frequency we want. It surely is easier to amplify a signal at 455 thousand cycles a second than 27 million, for sure!