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In the Armstrong method, the audio signal and the radio frequency carrier signal are applied to the balanced modulator to generate a double sideband suppressed carrier signal. The phase of this output signal is then shifted 90 degrees with respect to the original carrier. The balanced modulator output can either lead or lag the carrier's phase.
Balanced line actively driven with an asymmetrical signal, but connected to balanced impedances. There are a number of ways that a balanced line can be driven and the signal detected. In all methods, for the continued benefit of good noise immunity, it is essential that the driving and receiving circuit maintain the impedance balance of the line.
[1] [3] In a 1969 review of another book, Robert G. Chambers noted that there were not many textbooks covering these topics, as "since 1953, Kittel's classic Introduction to Solid State Physics has dominated the field so effectively that few competitors have appeared", noting that the third edition continues that legacy. Before continuing, the ...
The phase modulation (φ(t), not shown) is a non-linearly increasing function from 0 to π /2 over the interval 0 < t < 16. The two amplitude-modulated components are known as the in-phase component (I, thin blue, decreasing) and the quadrature component (Q, thin red, increasing).
1922: "Notes on the Theory of Modulation", Proceedings of the Institute of Radio Engineers, volume 10, issue 1, pages 57–64. 1924: A Generalization of Reciprocal Theorem, Bell System Technical Journal 3: 393–399. 1925: Selective Circuits and Static Interference, Bell System Technical Journal, 4:265.
Transmitters feeding a balanced transmission line will need a balun. This transforms the single ended output of the transmitter to a higher impedance balanced output. High power short wave transmission systems typically use 300 ohm balanced lines between the transmitter and antenna. Amateurs often use 300–450 ohm balanced antenna feeders.
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Optical homodyne detection. In electrical engineering, homodyne detection is a method of extracting information encoded as modulation of the phase and/or frequency of an oscillating signal, by comparing that signal with a standard oscillation that would be identical to the signal if it carried null information.