Skip to main content

E8C01:What is Quadrature Amplitude Modulation or QAM?

E8C01E8C

What is Quadrature Amplitude Modulation or QAM?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E8C01 is Transmission of data by modulating the amplitude of two carriers of the same frequency but 90 degrees out of phase.

The key fact is Transmission of data by modulating the amplitude of two carriers of the same frequency but 90 degrees out of phase. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

← E8B11E8C02 →

More questions in E8C

E8C02What is the definition of symbol rate in a digital transmission?E8C03Why should the phase of a PSK signal be changed at the zero crossing of the RF signal?E8C04What technique minimizes the bandwidth of a PSK31 signal?E8C05What is the approximate bandwidth of a 13-WPM International Morse Code transmission?E8C06What is the bandwidth of an FT8 signal?E8C07What is the bandwidth of a 4,800-Hz frequency shift, 9,600-baud ASCII FM transmission?