On 11/5/2012 10:47 AM, John Molenda wrote:
I still do not understand I/Qcan some one please tell me what this
means or at least stands for . thanks John kb2huk
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I = In phase: The carrier fed to the detector or modulator is at
zero degrees phase.
Q = Quadrature phase: The carrier fed to the detector or modulator
is 90 degrees out of phase with reference to the in-phase carrier.
By combining the I and Q baseband streams properly many different
transmission modes can be generated or demodulated. A more detailed
explanation is here:
http://en.wikipedia.org/wiki/Quadrature_phase
An excellent explanation of using I/Q techniques for modulation and
demodulation of AM, DSB, and SSB can be found in "Synchronous
Communications," _Proceedings of the IEEE_, December 1956;
republished in same journal in Vol 90, no. 8, August 2002 as a
classic paper. But I don't think it's available free online.
With my best,
Kevin, WB4AIO.
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