Re: Dave, one more question (please!!!)
- From: Kevin McMurtrie <mcmurtri@xxxxxxxxxxxxxx>
- Date: Wed, 01 Mar 2006 21:50:53 -0800
In article <5djNf.20$Aj6.16@xxxxxxxx>, "george" <nowhere@xxxxxxxxxxxx>
wrote:
"Dave Martindale" <davem@xxxxxxxxx> wrote in message
news:du3elt$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
RF energy causes electricity to spin in metals at a right angle. If you
have a partial loop, like the letter "C", then you'll get arcing across
the gap. A closed loop conducts electricity and that current flow
radiates the RF back out of it.
Welded metal racks are OK as long as they have no pointed ends. Metal
plates are OK as long as they don't reflect power away from your food.
Spoons are OK. Forks sometimes arc if the tines get enough power.
Broken foil seals on jars arc ferociously. CDs and metal rimmed plates
just barely conduct electricity so they get incinerated by arcing.
Back to the original question-
Silica gel shouldn't be microwaved because it explodes under that
much power. It can even destroy the oven because there's so much
microwave energy left over with nowhere to go. Bake it in a
conventional oven or buy new gel.
.
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- From: Dave Martindale
- Re: Dave, one more question (please!!!)
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