What are the characteristics of reflex klystron?
This microwave generator, is a Klystron that works on reflections and oscillations in a single cavity, which has a variable frequency. Reflex Klystron consists of an electron gun, a cathode filament, an anode cavity, and an electrode at the cathode potential. It provides low power and has low efficiency.
What is the working principle of reflex klystron?
Working Principle of Reflex Klystron Reflex Klystron works on the principle of velocity and current modulation. The electron beam is injected from the cathode. The electron beam passes through the accelerating anode. The electron moves in the tube with uniform velocity until it reaches the cavity.
What modes are generally used in a reflex klystron?
What modes are generally used in a reflex klystron? Ans. 1 ¾ and 2 ¾ are the most commonly used modes in a practical reflex klystron.
What are klystrons used for?
A klystron is a specialized linear-beam vacuum tube, invented in 1937 by American electrical engineers Russell and Sigurd Varian, which is used as an amplifier for high radio frequencies, from UHF up into the microwave range.
What are the limitations of reflex klystron?
Drawbacks or disadvantages of Klystron Following are the disadvantages of Klystron: ➨Two cavity klystron amplifier is not low-noise device. Due to this fact, usually it is used in the transmitter and not in the receiver. ➨It is a narrow band device due to use of resonant cavities.
What is Gunn power supply?
The Gunn power supply delivers the DC and control voltages required for the operation of the Gunn oscillator and PIN modulator and. enables the demodulated microwave signal to be quantitatively evaluated. Furthermore, this unit has various inputs and outputs. for experiments on modulation and characteristics.
Who invented the klystron?
Sigurd Fergus Varian
Russell Harrison Varian
Klystron/Inventors
The brothers Russell and Sigurd Varian of Stanford University are the inventors of the klystron. Their prototype was completed in August 1937. Upon publication in 1939,[1] news of the klystron immediately influenced the work of US and UK researchers working on radar equipment.
What is the maximum theoretical efficiency of the reflex klystron?
22.7%
The maximum electronic efficiency of reflexive klystron is 22.7%.
What are the advantages of reflex klystron?
Following are the benefits or advantages of Klystron: ➨It operates at higher efficiencies. ➨In klystron, each cavity operates independently and there is no mutual coupling.
What is pin modulator?
Pin Modulator are used to provide amplitude or pulse modulation in wide range of microwave to study many applications. These modulators uses PIN diode which is mounted across the waveguide line with RF isolated DC bias lead passing to an external TNC (F) Technical Specifications: Band : X. Frequency (GHz) : 8.2 – 12.4.
Why Gunn diode is called diode?
The Gunn diode or transferred electron device can be termed a diode because it has two electrodes. This negative resistance region means that the current flow in diode increases in the negative resistance region when the voltage falls – the inverse of the normal effect in any other positive resistance element.
What is reflex klystron used for?
Reflex klystron is a single cavity klystron that can be used as low power microwave oscillator. Due to the DC voltage in the cavity, a Radio Frequency (RF) noise is generated. The electron beam injected from the cathode is velocity modulated by the cavity gap voltage.
What is the difference between two-cavity and reflex klystron?
Like a two-cavity klystron, a reflex klystron utilizes the phenomenon of velocity and current modulation to produce oscillations. However, there exist variation in constructional structure and the respective applications of the two. A reflex klystron consists of a single cavity that performs the action of both buncher and catcher cavity.
Can reflex klystron be used as microwave oscillator?
Reflex klystron is a single cavity klystron that can be used as low power microwave oscillator. Due to the DC voltage in the cavity, a Radio Frequency (RF) noise is generated.
What is transit time of reflex klystron?
2. What is transit time? Ans. It is the time taken by the electrons to travel from cathode to anode. 3. What is the operating principle of reflex klystron? Ans. It works on the principle of velocity modulation and current modulation. The operating principle of reflex klystron is clearly explained from the following figure: 4.