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| howto:hambasics:sections:wavemodulation [2020/11/08 15:26] – [Wave Addition] va7fi | howto:hambasics:sections:wavemodulation [2022/11/04 18:52] (current) – [AM] va7fi |
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| ====== Properties of Waves ====== | ====== Properties of Waves ====== |
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| Here we dive a little more deeply into waves and look at three ways that a "pure" radio wave (called the //carrier//) can be modulated to encode a voice signal (called the //baseband// signal): //AM, SSB, FM//. | Here we dive a little more deeply into waves and look at three ways that a "pure" radio wave (called the //carrier//) can be modulated to encode a voice signal (called the //baseband// signal): //AM, SSB, FM//. |
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| Here are two moving waves (press the play {{/play.png}} button on the bottom left corner of the picture). What's different about them? What's the same? | Here are two moving waves (press the play {{/play.png}} button on the bottom left corner of the picture). What's different about them? What's the same? |
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| {{ggb>howto/hambasics/sections/travelingwave.ggb 800,250}} | {{ggb>/howto/hambasics/sections/travelingwave.ggb 800,250}} |
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| When two waves overlap, they add up together at every point. Here, the <fc #4682b4>blue</fc> and <fc #008000>green</fc> waves are generated and add up together to form the <fc #ff0000>red</fc> wave. You can move the blue and green waves and see the result. To convince yourself that the red wave is really the sum of the blue and green waves, look at points <fc #4682b4>A</fc>, <fc #008000>B</fc>, and <fc #ff0000>C</fc>. You can move the blue or green waves by sliding their phase (<fc #4682b4>φ</fc> and <fc #008000>Φ</fc>) around. You'll see that point <fc #ff0000>C</fc> is always the sum of <fc #4682b4>A</fc> and <fc #008000>B</fc>. | When two waves overlap, they add up together at every point. Here, the <fc #4682b4>blue</fc> and <fc #008000>green</fc> waves are generated and add up together to form the <fc #ff0000>red</fc> wave. You can move the blue and green waves and see the result. To convince yourself that the red wave is really the sum of the blue and green waves, look at points <fc #4682b4>A</fc>, <fc #008000>B</fc>, and <fc #ff0000>C</fc>. You can move the blue or green waves by sliding their phase (<fc #4682b4>φ</fc> and <fc #008000>Φ</fc>) around. You'll see that point <fc #ff0000>C</fc> is always the sum of <fc #4682b4>A</fc> and <fc #008000>B</fc>. |
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| {{ggb>howto/hambasics/sections/waveaddition.ggb 800,500}} | {{ggb>/howto/hambasics/sections/waveaddition.ggb 800,500}} |
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| <WRAP center round important box 80%> | <WRAP center round important box 80%> |
| Let's pause for a minute and highlight that here, we are **multiplying** two waves together (not simply adding them). Later on, we'll see that the electronic component that does that is called a //mixer//, not to be confused with an sound mixer, which does do addition. | Let's pause for a minute and highlight that here, we are **multiplying** two waves together (not simply adding them). Later on, we'll see that the electronic component that does that is called a //mixer//, not to be confused with a sound mixer, which does do addition. |
| </WRAP> | </WRAP> |
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