1. "It takes lots of power if the antenna is significantly smaller than the wavelength of interest." 04:00 2. He wants to construct a lambda antenna, but what about spatial sampling theorem? 07:30 3. X(omega - omega_c) 13:20 3. "Frequency Division Multiplexing: Frequencies have to be high compared to the message frequency." 25:00 4. Modulation and aliasing? 25:45
How to see conjugate symmetry? 15:45 Multiplying cosine with a function so the product becomes 1 is a bad idea, as with the zeros the function would have to go to infinity. 22:30 Synchronous modulation. 22:50 (You have to be exactly synchronized in phase?) Red and blue Dirac? 26:45
Just checked the MIT OCW playlist and it's there. Maybe you are using a different playlist? MIT OCW's playlist: ru-vid.com/group/PLUl4u3cNGP61kdPAOC7CzFjJZ8f1eMUxs. Best wishes on your studies!
and then, sidebands appear out of nowhere, by choosing the correct formula, none of these professors actually know, in a technical way, how those sidebands appear in a technical sense. it is called amplitude modulation because when originally thought up the composite showed an amplitude modulation and the changing of the plate voltage of the tube, no one suspected the presence of sidebands until over a decade later. And here we are teaching with composite waveforms to perpetuate the misnaming. It is like the direction of electron current flow, professors just keep teaching what is passed along even if it is wrong, because they can not unlearn what they initially learned. So, do you, after watching this, know where the sidebands came from without resorting to parroting the formulas above....I did not think so.
15:57 for anyone else curious. I believe you are correct Sergio and that the instructor missed the negative sign as e^(jwt) = cos(wt)+j sin(wt) but e^(-jwt) = cos(wt) -j sin(wt).
The course materials is very much IT technology and the explanation of, And it spams my understanding in the objective analysis due the information containing IT technology in the mere example of a module. Much rather have a business module explanation which gets into the different types of business within a control list in enumerated way,which presents meta data or styles of a business which might determine the provisions in ramifications to create an off sets that has been procured.
Weed plays those tricks on your mind, making you think you have had an epiphany of brilliance, some revelation of pure genius. Really though, you are just confused. Revisit your idea when you are sober and lucid and you realize how dumb your idea was.
