Here’s your video introduction to ARRL General Class License Manual Lesson 5.1, Signal Review. The section is primarily review, but let’s spend a few minutes walking through the vocabulary so the concepts are firmly in mind before proceeding to the subsequent sections. This video covers continuous wave (with a brief excursion back to the spark era), carriers, modulation, modes, AM, and Single Side Band. Included is an actual on-the-air demo with a spectrum scope to look at an AM signal showing the carrier and both sidebands, and how each sideband contains all the information. A demonstration follows with just single sideband modulation. The video concludes with an introduction to angle modulation modes such as FM and phase modulation.
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