What is the local oscillator with a special vacuum tube called?

What is the local oscillator with a special vacuum tube called?

• A. Reflex Klystron
• B. Crystal Oscillator
• C. Gunn Diode
• D. Magnetron

Answer: (A)

The idea being tested is the specialized vacuum-tube oscillator used as a local reference in microwave systems. A reflex klystron is a compact, tunable vacuum-tube device that provides a stable microwave signal suitable for mixing in receivers. It achieves oscillation with a single resonant cavity and a repeller electrode that feeds part of the electron beam back into the cavity, sustaining the oscillation. By adjusting the bias on the anode and the repeller voltage, you can tune its output frequency to the desired local-oscillator frequency, which is essential for accurate down-conversion to the intermediate frequency. The crystal oscillator uses a crystal resonator (not a vacuum tube) and isn’t a microwave-tube device. The Gunn diode is a solid-state device, not a vacuum tube, and the magnetron is a high-power transmitter oscillator rather than a tunable local oscillator for receivers.

The idea being tested is the specialized vacuum-tube oscillator used as a local reference in microwave systems. A reflex klystron is a compact, tunable vacuum-tube device that provides a stable microwave signal suitable for mixing in receivers. It achieves oscillation with a single resonant cavity and a repeller electrode that feeds part of the electron beam back into the cavity, sustaining the oscillation. By adjusting the bias on the anode and the repeller voltage, you can tune its output frequency to the desired local-oscillator frequency, which is essential for accurate down-conversion to the intermediate frequency. The crystal oscillator uses a crystal resonator (not a vacuum tube) and isn’t a microwave-tube device. The Gunn diode is a solid-state device, not a vacuum tube, and the magnetron is a high-power transmitter oscillator rather than a tunable local oscillator for receivers.