Re: Dave, one more question (please!!!)


"Dave Martindale" <davem@xxxxxxxxx> wrote in message
news:du3elt$rn6$1@xxxxxxxxxxxxxxxxxx

The operating conditions of the magnetron *are* different depending on
whether the oven has an adequate load (energy absorber) in it. With a
suitable load, the microwaves generated by the tube pass into the oven
and little of that energy returns to the tube. With no load, more of
the energy returns to the tube and there will be standing waves set up
in the oven cavity. Now, the magnetron may be designed to withstand
this and not be affected in any long-term way, or it might be damaged if
designed differently. But the waveform present at its output antenna
*does* depend on load, and it's at least plausible that the magnetron in
*some* microwave ovens may be damaged - even if yours is not.

The standing waves in the oven also mean you're more likely to get
arcing from any foreign object in the cavity, but that's not directly
related to how the magnetron reacts to its load.

Dave

Oh good...someone who understands microwaves <g>. I have a question for
you. Why is it that some microwaves (mine, for instance) have a metal rack
in them and they are just fine with that...but all the microwaves I've seen
(mine included) arc if some foreign metal object gets in (like a tiny bit of
foil seal at the top of a jar)???

TIA,
George


.

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