RF-OM
Joined: 03 Aug 2007
Posts: 607
Helped: 113
Location: The Earth
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 13 Jul 2008 7:15 Re: Superheterodyne LO stability,power ,Mixer input impedanc |
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| Thank you for this link. It is interesting. I knew about Heaviside prediction about ionosphere, but never heard about the musical Cats. Regarding my observation it is just an observation. After thinking about it I decided that the reason is probably in big time gap between the time when students learn trigonometry and when they study electrical network theory. When they learn trigonometry they practically concentrate on right triangle solutions and think that they know what it is Sin and other circle functions. They can calculate them and use to solve school problems. Several years later they start to use circular functions for electrical network theory and continue to use mathematical expressions for circular functions but do not understand them right. This is why I think that using trigonometry formulas for explanations of electrical phenomena is good and may help, but often is not enough for good understanding. Often when I am interviewing electrical engineer he is able to discuss all the math behind Fourier transforms, but he is absolutely sure that Sin is the ratio between leg and hypotenuse in the right triangle.
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