PeterD wrote:
On 28 Dec 2006 18:28:36 -0800, "Father Haskell"
wrote:

PeterD wrote:
On 28 Dec 2006 09:59:01 -0800, "Father Haskell"
wrote:

PeterD wrote:
On 28 Dec 2006 09:09:15 GMT, jasen wrote:

On 2006-12-27, Roddy Meatstick.............. wrote:
Father Haskell wrote:
What goodies do I have?

See if you can figure out why they can't make a QUIET fan in a microwave.
it takes quite a breeze to cool the magnetron


Bye.
Jasen
The fan's job is more than cooling the magnetron. The blades of the
fan are used to disperse the microwaves inside the oven to help
prevent cooking hot spots. Some of the noise is due to the size of the
blades (they are more efficient at dispersing the microwaves than at
moving air!)

Some microwave ovens with turntables have quieter fans because the
need to disperse the microwaves is less of a problem with the
turntable.
The fan I pulled had plastic blades.
Turntable oven? They don't use the fan for disperal usually. (and they
are often times quieter, too!)
Do they sell anything other than turntable models any more?

Probably not! g The turntables work so much better...

I think they all have turntables now. I took apart an early one that
didn't have a turntable. It did have an aluminum bladed unpowered fan in
the top. The air from the fan turned the deflector the deflector
redirected the microwaves throughout the oven. The microwaves were
rotating instead of the food. Same difference.
Aren't infrared waves higher frequency? Why ain't a toaster over faster?