AdvancedA-005-001-010
An apparatus with an oscillator and a class C amplifier would be:
C
Answer
Antennas and transmission lines
Type
A
a fixed-frequency single-sideband transmitter
B
a two-stage regenerative receiver
C
a two-stage CW transmitter
D
a two-stage frequency-modulated transmitter
Answer Notes
A basic two-stage Continuous Wave (CW) transmitter consists of a master oscillator to generate the radio frequency signal and a power amplifier to boost that signal for the antenna. Because a CW signal is simply an unmodulated carrier that is keyed on and off, it does not require linear amplification.
Class C amplifiers are highly efficient but extremely non-linear, meaning they severely distort the amplitude of complex signals. This makes them perfect for simple on/off CW transmission or FM signals, but completely useless for single-sideband (SSB) transmitters, which require linear amplifiers (like Class A or AB) to preserve the complex amplitude variations of the voice signal.
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A circuit depending on positive feedback for its operation would be a:
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In an oscillator where positive feedback is provided through a capacitor in series with a crystal, that type of oscillator is a: