chapter 2 adn 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| the most elementary reciever device | tuned radio frequency reciever
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| the minimum input RF signal to a reciever required to produce a specified audio signal at output | sensitivity
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| input noise level to a reciever | noise floor
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| the extent to which a reciever can differentiate between the desired signal and other signals | selectivity
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| another name for diode detector | envelope detector
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| another name for synchronous detector or product detector | heterodyne detector
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| the mixer stage in a superheterodyne reciever that mixes the RF signal with a local oscillator signal to form the intermediate frequency signal | first detector
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| small variable cap in parellel with each section of a ganged capacitor | trimmer
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| small variable cap in series with each ganged tuning capacitor in a superheterodyne reciever to provide near perfect tracking at the low end of tuning range | padder capacitor
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| have small internal capacitance that vaires as a function of their reverse bias voltage | varactor diodes
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| another name for varactor diodes | varicap diodes
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| undisired input frequency in a superheterodyne reciever that produces the same intermediate frequency as the desired input signal | image frequency
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| superheterodyne reciever design that has two seperate mixers, local oscillators, and image frequencys to avoid image frequency problems | double conversion
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| distortion that results from undesired mixer outputs | cross modulation
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| another name for mixers | converters/first detectors
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| troubleshooting by injecting an input signal and tracing it throughh a circuit | signal injection
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| impressing a low frequency intelligence signal onto a higher frequency carrier signal | modulation
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| characterised by a nonlinear output versus input signal relationship | nonlinear device
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| band of frequency in a modulator from the creation of sum-frequencies between the carrier and information signals | upper sideband
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| band of freq produced in a modulator from the creation of difference freq between the carrier and information signals | lower sideband
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| measure of hte extent to which a carrier voltage is varied by the intelligence for AM system | percentage modulation
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| another name for percent modulation | modulation index/modulation factor
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| when an excessive intelligence signal overdrives an AM modulator producing modulation over 100% | overmodulation
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| distortion resulting in an overmaodulated AM transmission creating excessive bandwidths | sideband splatter
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| a modulation system where the intelligence is injected into the base of a transistor | base modulation
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| a capacitor that cancels fed-back signals to suppress self oscillation | neutralizing capacitor
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| higher frequency self oscillations in RF amps | parasitic oscillations
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| stage that generates the AM signal | modulated amplifier
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| amplified stage that amplifies a signal prior to reaching the final amplifier stage in a transmitter | driver amplifier
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| ensuring that an oscillator starts by turning the dc on and off | keying
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| improper bias or low carrier signal power in AM modulator | low excitation
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| have modualtion applied to the output of the device | high-level modulation
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| have modulation applied to an input of the device | low-level modulation
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| the decrease in dc output current in an AM modulator usually caused by low excitation | downward modulation
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| instrument used to measure the harmonic content of a signal by displaying a plot of amplitude verses frequency | spectrum analyzer
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| undesired frequency components of a signal | spurs
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| extra frequency components that appear in the spectral display of a signal, signifying distortion | spurious frequencies
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| the baseline on a spectrum analyzer display | noise floor
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| expression specifying the fundamental frequency component of a signal with respect to its largest harmonic in dB | relative harmonic distortion
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| a measure of distortion that takes all significant harmonics into account | total harmonic distortion
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| resistive load used in place of an antenna to test a transmitter without radiating the output signal | dummy antenna
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| grid modulation circuits is a class ___ RF amp | Class A
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| the process of applying modulation to the driver in a transistor modulator | pre-modulation
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| 2 reasons you dont get the bandwidth you sohuld | 1) the TRF(Tuned radio frequency) reciever 2)our implementation of the AM broadcast scheme
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| process of pulling the audio signal out of the carrier and sidebands(RF envelope) | detection (demodulation)
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| the generations of new frequencies by mixing or multiplying two oscillating waveforms | heterodyne
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