Term
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Definition
| Impressing a low-frequency intelligence signal onto a higher-frequency carrier signal. |
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Term
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Definition
| Characterized by a nonlinear output versus input signal relationship. |
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Term
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Definition
| The band of frequencies produced in a modulator from the creation of sum frequencies between the carrier and information signals. |
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Term
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Definition
| The band of frequencies produced in a modulator from the creation of difference frequencies between the carrier and information signals. |
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Term
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Definition
| The measure of the extent to which a carrier voltage is varied by the intelligence for AM signals. |
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Term
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Definition
| Another name for percentage modulation; represented as a decimal quantity between 0 and 1 for AM transmitters. |
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Term
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Definition
| Another name for modulation index. |
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Term
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Definition
| When an excessive intelligence signal overdrives an AM modulator producing percentage modulation over 100%. |
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Term
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Definition
| The distortion resulting in an overmodulated AM transmission creating excessive bandwidths. |
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Term
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Definition
| A modulation system in which the intelligence is injected into the base of a transistor. |
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Term
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Definition
| Modulation in an AM transmitter, intelligence superimposed on the carrier at the last point before the antennae. |
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Term
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Definition
| Modulation in an AM transmitter, intelligence superimposed on the carrier; then the modulated waveform is amplified before reaching the antennae |
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Term
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Definition
| A capacitor that cancels fed-back signals to suppress self-oscillation. |
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Term
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Definition
| Higher-frequency self-oscillations in RF amplifiers. |
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Term
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Definition
| The stage that generates the AM signal. |
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Term
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Definition
| Ensuring that the oscillator starts by turning the DC On and Off. |
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Term
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Definition
| The improper bias or low carrier signal power in an AM modulator. |
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Term
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Definition
| The decrease in DC output current in an AM modulator usually caused by low excitation. |
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Term
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Definition
| An instrument used to measure the harmonic content of a signal by displaying a plot of amplitude versus frequency. |
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Term
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Definition
| The extra frequency components that appear in the spectral display of a signal, signifying distortion. |
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Term
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Definition
| The undesired frequency components of a signal. |
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Term
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Definition
| The baseline on a spectrum analyzer display. |
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Term
| Relative Harmonic Distortion |
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Definition
| The expression specifying the fundamental frequency component of a signal with respect to its largest harmonic in dB. |
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Term
| Total Harmonic Distortion |
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Definition
| A measure of distortion that takes all significant harmonics into account. |
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Term
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Definition
| The resistive load used in place of an antenna to test a transmittor |
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Term
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Definition
| The resistive load used in place of an antenna to test a transmitter without radiating a signal. |
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