| Electronics > Beginners |
| Magnetron frequency |
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| testtube44:
I have a weird idea, what would happen if you replace a magnetron's magnets with electromagnets and vary the magnetism. Could you change the frequency of the microwaves? |
| drussell:
The frequency is mostly influenced by the physical geometry. |
| Alex Eisenhut:
Buy a YIG. https://en.wikipedia.org/wiki/YIG_sphere You are on to something! |
| GeoffreyF:
As others said, the frequency is based on the geometry. The Magnets are big. If you crack the beryllium ceramic insulator while taking a magnetron apart, and you inhale even some dust - you could get berylosis, a fatal disease. With the voltages and energies involved in a Magnetron, if you have to ask, don't. Be thoroughly versed in every single aspect of these devices before you do anything. |
| chris_leyson:
For a standard microwave oven magnetron the anode insulator IS NOT beryllium it's ceramic. I don't know why people people persist with this myth. Read a data sheet for an oven magnetron and there won't be any mention of beryllium. Similarly if it were berylliun there would be a mandatory warning sticker on the magnetron. I work for a company that designs and manufactures microwave ovens so I know what I'm talking about. I've even got some on my desk, in fact a lot of the engineers have one or two lying around, some take the magnets out and one guy cut one in half to show people what the anode block looks like. If anything is going to kill me it won't be the non existant berillium oxide it will be a 4kV inverter and I'm going to make damn sure that doesn't happen. Big high power radar magnetrons, berillium oxide insulator maybe, read the data sheet but little piss ant 1200W ones no. Rant over Anyway, back on topic, some magnetrons have an integral electromagnet to control output power, National YJ1530SP is one example https://www.relltubes.com/filebase/en/src/Datasheets/yj1530sp.pdf. Also, the power spectrum from a magnetron is basically crap, it could easilly be 100MHz wide so it's no good as a signal source, might make a good jammer though. If you want to use a tube try a reflex klystron if you can get one. |
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