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Questions tagged [magnetron]

A magnetron tube is a metal clad glass tube with a hot cathode in the center which is surrounded by a powerful magnet. It is a low-cost way to generate ~10 GHz microwaves of high intensity but not a stable frequency. It is good for cooking food but no longer used for Radar. The Klystron tube is a much better microwave generator.

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Microwave magnetron connections reversable F, FA?

The two connections on a microwave magnetron are labeled F (filament) and FA (filament anode), both being either ends of a heated filament powered by a 3V AC supply, and the FA connection being ...
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Testing Industrial Magnetron with Megohm meter?

Magnetrons can have a variety of failure modes, I'm trying to come up with a better test besides applying high voltage in a system and blowing fuses, or blindly swapping it out for a new one when an ...
MadHatter's user avatar
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Selection of diode and transformer for a 1500 W magnetron [closed]

I have a 1500 W magnetron. What diode and transformer can I use for it?
Erfan Mozafari's user avatar
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2 answers
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Power supply for 9.4 GHz magnetron [closed]

I need a power supplier for a magnetron with following specifications. Can someone help me out with the design? Frequency 9380 to 9440 MHz (Fixed) Output power (Peak) 25 kW Duty cycle / Pulse ...
Aurimas Karosas's user avatar
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1 answer
63 views

CW magnetron operation [closed]

What limits the duty cycle for turning the magnetron of a microwave oven on? What is the maximum width of the magnetron turning on time in one cycle, if the switching cycle is 30 seconds (on + off). ...
Mohammad Elmorsy's user avatar
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Heating of water by magnetron

I want to know how to calculate heating effects of magnetron. How much heat will be generated in water by 3kW output 2.45GHz magnetron?
Qwerty's user avatar
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Could a DIY 1 kW portable version of the military non-lethal microwave beam active denial system (ADS) be made?

How would one create a portable 1 kW microwave emitter that projects out a 95 GHz beam to about 5 - 10 feet? What kind of components would be required? I recently came across this fascinating video ...
emtinkerer's user avatar
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2 answers
202 views

How to generate microwave band frequencies like 85GHz? Is there a DIY device or parts kit to do this? [closed]

Let's say I want to build a device that generates and sends out a microwave of some arbitrary specific frequency to a short distance, say 1 - 2 feet. For example, 95 GHz. Is there a straightforward ...
emjunkie's user avatar
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What does information on a 2m319J D622 magnetron label imply?

I been looking for a 2m319J D622 magnetron at reasonable $. I see the D622 also D623 and D625 ,, What do the values imply, I've been unable to find any info..
xtal's user avatar
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Connecting microwave oven magnetron with coaxial cable (for a simple plasma torch)

I would like to try and build a basic microwave plasma torch using an oven magnetron. I've had experience with S-Band RF back in my physical chemistry days but am not liking the prices for waveguides. ...
nitrous dude's user avatar
3 votes
1 answer
520 views

What dictates the current drawn by a magnetron's anode?

Typically AFAIK in a magnetron from a commercial microwave oven, the cathode filament is heated by a 3.3V 10A supply, generating a cloud of electrons by thermionic emission. The anode cavity resonator ...
Oliver Walters's user avatar
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Is a microwave's cooking cavity of particular dimensions according to the characteristics of the input microwave feed?

i.e. if I were to connect the magnetron inside my microwave to a slightly different steel box (see pic) of a different size and shape (provided the volume inside was roughly similar to the one in my ...
Oliver Walters's user avatar
1 vote
2 answers
399 views

How is the frequency in the label behind microwave ovens determined? How could one measure the frequency?

It is very common online for people on youtube, forums, and other social media to bring up the following fun home experiment to "measure the speed of light" using chocolate and a microwave ...
Maximal Ideal's user avatar
2 votes
1 answer
615 views

Understand magnetron monitor circuit

I'm trying to understand the lightbulb monitor section of the following circuit, the 2200 uF cap, zener, choke, and bulb. Everything else is a standard microwave oven circuit. The magnetron will not ...
PWalsh's user avatar
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Magnetron as receiver

If a magnetron is heated, but no high voltage applied, and microwave power of matching frequency is externally applied to its "output", would that produce a voltage across the HV terminals? ...
dronus's user avatar
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Can I extend the the antenna of a magnetron with a cable?

If I connect a piece of heavy copper wire or copper rod to the antenna cap of a magnetron can I guide the current so that microwaves would be emitted further away?
Manu de Hanoi's user avatar
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Microwave Turntable Absorption

Do microwaves turntables absorb some microwave radiation when being used? I heard that they can act as a minimum load on the magnetron. If this is true, can I interchange microwave turntables? Edit: ...
Steve's user avatar
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Using a non-time domain equation for a nonlinear equation based device in QUCS

I'm trying to model a magnetron oscillator source in QUCS. I am only interested in the output of the magnetron, not how it is powered. Traditionally a magnetron is modeled the same as many oscillators,...
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Why is a microwave oven equipped with a waveguide? [duplicate]

In a microwave oven, the magnetron connects to the waveguide.  Magnetrons produce microwaves, which are guided into the cooking chamber by waveguides. Why don't we directly connect the magnetron to ...
Prerna 's user avatar
-1 votes
2 answers
148 views

How reflection occuring in antenna fed by transmission line affects performance?

Transmission line considered is lossless. Basically the configuration is simple. For transmitter side : a non ideal source (can be voltage current or power) feeding a transmission line (TL1) with ...
SUNITA GUPTA's user avatar
3 votes
5 answers
2k views

Can a lower voltage overheat a magnetron?

Background I am working on a microwave oven that starts to emit an odor after 2 minutes of full heating despite otherwise working correctly. The smell is the same as that "sweet", ...
kackle123's user avatar
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3 answers
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Drive a magnetron with low power via a CCFL backlight driver

[EDIT] My real question here is: can a magnetron from a microwave oven be used to output low power microwaves? If so, how can I achieve this? If not, what is a source for low power microwaves? In this ...
iamnotgoodwithcomputer's user avatar
5 votes
2 answers
815 views

How is it possible that emitting electrons create alternating charges in the cavities of a magnetron?

In a magnetron, electrons are emitted from the cathode and create alternating charges in cavities (fig). These alternating charges produce oscillations in the cavities which result in electromagnetic ...
Prerna's user avatar
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2 answers
400 views

In what pattern does the electrons get emitted from cathode in thermionic emission?

We have structure with an cathode and filament at the center. A cylindrical shaped anode with cavities surrounds the cathode (fig 1). When the cathode get heated the electrons are emitted from cathode ...
Prerna's user avatar
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6 answers
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Magnetron Working Principle

I was reading this simple description of magnetron working principle. Can you explain me why when electrons go near the cavities, they start to resonate at microwave frequency? I do not see the link ...
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Microwave oven: How can I temporarily limit the startup load?

Problem: It's a common problem for "NON-inverter" type microwave ovens to pop circuit breakers, and mine is no exception. UPDATE Jan 2021: Extension / power strip added, (mentioned below) ...
DaaBoss's user avatar
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13 votes
4 answers
6k views

What causes loss of power over lifetime of a magnetron?

The power of a magnetron declines over time\$^1\$. While not noticable for most consumer applications (A 2000-hour lifetime would last over 20 years if the device is used only 15 minutes a day), this ...
Joren Vaes's user avatar
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6 votes
2 answers
2k views

UHF Tesla coil powered by low voltage?

I want to know if it is possible to use a 2.4 GHz magnetron as a oscillator for a Tesla coil circuit. The idea is to use a oscillating relay-driven step up transformer (12 V to 10 kV) and then charge ...
South African Railfan's user avatar