November 2007
Intermediate to advanced
736 pages
46h 32m
English
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AM/FM BASICS
A radio frequency wave may be modulated in accordance with intelligence to be transmitted by varying either the amplitude or the frequency of the r.f. oscillations. In an amplitude modulated wave, the amplitude of the r.f. oscillation is varied in accordance with the intelligence to be transmitted, while the frequency of the oscillations is maintained constant. The intelligence to be transmitted usually consists either of an audio modulating signal with the frequencies in the range 20 Hz to 20 kHz or a video modulating signal, with frequencies from dc to several megahertz. The modulating signal is superimposed upon the radio frequency carrier by applying both to a nonlinear impedance (e.g. the modulator). When this is done, the modulating ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.