A magnetic field is applied longitudinally by an external magnet. Connected to a resonant line, it can act as an oscillator. Magnetrons are capable of generating extremely high frequencies and also short bursts of very high power. They are an important source of power in radar systems and in microwave ovens. now i need to change or control for this frequency .how can that ?
It is possible by a change of sizes of resonator volume. The units of automatic control of the frequency of magnetrons use changing the position of the piston inside resonator camera of the magnetron.
You can change the frequency of a magnetron over a small range by changing the match of the output line. This is called frequency pulling and the data may be shown in the performance data by a Reike diagram which shows power, efficiency and frequency as a function of output match on a Smith Chart.
Otherwise Vadym Slyusar is right, this is a standard type of tuneable magnetron.
The frequency can also be changed in manufacture by changing the size of the resonant cavities or by adjusting the capacitive rings, if there are any. A large change in frequency will probably require a change in magnetic field or drive voltage or both.
Vadym Slyusar You mean to change the size of the magnet's core ..I think we can change the frequency in a certain range by changing the voltage exerted
Malcolm White In the event that I do not want to go to the manufacturing process .. Is it possible to control the voltage entering the magnetic core?
The frequency is changed slightly by the current (this is called frequency pushing), which is driven by the voltage, but there is usually only a limited amount of current tuning.
I don't understand what you mean about the voltage entering the magnetic core.
The frequency is mainly determined by the resonant frequency of the resonators around the magnetron. Vadym Slyusar describes how this can be changed by inserting posts into the resonators. Other things like the voltage and magnetic field have to be close to values that are required to make a magnetron of that size and frequency work.
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