| 摘要 |
A measurement of the group delay and the amplitude response of the upper and lower sidebands of a transmitter is provided by amplitude modulating with a tone a video signal that modulates the transmitter carrier. The frequency of the video signal is changed to provide a search or coverage over the frequency bands of the upper and lower sidebands. A mixing and frequency selection are performed at the transmitter RF output to select a particular upper and lower sideband. An envelope detector demodulates the tone that is amplitude modulated on the selected sideband signal. The amplitude of this detected signal is indicative of the amplitude response and the phase of the detected signal relative to a reference phase is indicative of the group delay at the selected sideband signal.
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