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2. Single-sideband modulation - Wikipedia

   en.wikipedia.org/wiki/Single-sideband_modulation

   In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently.

3. Sideband - Wikipedia

   en.wikipedia.org/wiki/Sideband

   The power of an AM radio signal plotted against frequency. fc is the carrier frequency, fm is the maximum modulation frequency. In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, that are the result of the modulation process. The sidebands carry the information transmitted by the radio ...

4. Scattering parameters - Wikipedia

   en.wikipedia.org/wiki/Scattering_parameters

   Although applicable at any frequency, S-parameters are mostly used for networks operating at radio frequency (RF) and microwave frequencies. S-parameters in common use - the conventional S-parameters - are linear quantities (not power quantities, as in the below mentioned 'power waves' approach by Kaneyuki Kurokawa (黒川兼行)).

5. Product detector - Wikipedia

   en.wikipedia.org/wiki/Product_detector

   The frequency of the local oscillator must be the same as the frequency of the carrier, or else the output message will fade in and out in the case of AM, or be frequency shifted in the case of SSB; Once the frequency is matched, the phase of the carrier must be obtained, or else the demodulated message will be attenuated, but the noise will ...

6. In-phase and quadrature components - Wikipedia

   en.wikipedia.org/wiki/In-phase_and_quadrature...

   The two amplitude-modulated components are known as the in-phase component (I, thin blue, decreasing) and the quadrature component (Q, thin red, increasing). A sinusoid with modulation can be decomposed into, or synthesized from, two amplitude-modulated sinusoids that are in quadrature phase , i.e., with a phase offset of one-quarter cycle (90 ...

7. Carrier wave - Wikipedia

   en.wikipedia.org/wiki/Carrier_wave

   The frequency spectrum of a typical radio signal from an AM or FM radio transmitter. The horizontal axis is frequency; the vertical axis is signal amplitude or power. It consists of a signal (C) at the carrier wave frequency f C, with the modulation contained in narrow frequency bands called sidebands (SB) just above and below the carrier.

8. Independent sideband - Wikipedia

   en.wikipedia.org/wiki/Independent_sideband

   ISB is a compromise between double sideband (DSB) and single sideband (SSB) — the other is vestigial sideband (VSB). If the sidebands are out of phase with each other, then phase modulation (PM) of the carrier occurs. AM and PM together then create quadrature amplitude modulation (QAM). ISB may or may not have the carrier suppressed.

9. Two-tone testing - Wikipedia

   en.wikipedia.org/wiki/Two-tone_testing

   Circuit components such as amplifiers can be tested using the two-tone method with a test setup like that shown in the figure. Two signal generators, set to two different frequencies F1 and F2, are fed into a power combiner through circulators. The combiner needs to have good isolation to prevent the signal from one generator being sent to the ...