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Old 03-18-2018, 02:44 PM   #1
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Microwaves and Magnets

Can someone resolve a microwave issue for us?
We have a Sport and have run out of room on the metal marker board for any more National Park magnets to fit on it. The only other metal surface to add magnets are the sides of the microwave. Does anyone know if magnets will harm or affect the microwave's performance?
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Old 03-18-2018, 04:04 PM   #2
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As long as you don't put them inside the microwave they should have no effect.
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Old 03-18-2018, 04:21 PM   #3
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They might vibrate a bit when you are towing...and possibly scuff the paint.
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Old 03-19-2018, 11:07 AM   #4
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The "heart" of every microwave.... is a HUGE, POWERFUL MAGNET... It's shaped like a doughnut and aligns the RF-energy through a wave-guide to direct all that RF energy towards your food to heat it up.
There is no harm in placing refrigerator-type magnets on a microwave.
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Old 03-19-2018, 11:47 AM   #5
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As an alternative, you might mount a magnetic board somewhere, and put your magnets there.

I have one on my bathroom door.

Maggie
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Old 03-19-2018, 02:04 PM   #6
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No danger. I have magnets on my vintage Amana Radar Range at home.
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Old 03-19-2018, 02:11 PM   #7
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As a side note on the Microwave technology:

The huge magnet is part of a vacuum tube properly called a "Magnetron" and it works by spinning a cloud of electrons inside the tube past a bunch of cleverly shaped slots that generates the radio frequency it puts out to cook the food. The magnet is what makes the electrons spin.

In the RF engineering trade, a Magnetron tube is often referred to as a "Maggie". Fancy that...

(Traveling Wave Tubes (TWT), another sort of microwave amplifier, are often referred to as "tweets"..just another version of verbal shorthand in the engineering field...that is more-or-less G-rated)

--This has been your random engineering factoid of the day, stay tuned for more weirdness...
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Old 03-19-2018, 03:14 PM   #8
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if you want to destroy the magnetron tube in your uwave, place small bits of metal in it
it you want to create a fire and possibly injure people, place a magnet or a large piece of metal in and turn it on

the screen pattern on the front has holes that are too small for the uwave waves to go through. though the inside is metal, it was DESIGN and tested to be safe. adding more metal is just dangerous
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Old 03-19-2018, 03:21 PM   #9
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Interestingly, there was a brand of microwavable meals that had an aluminum crimped-on lid with a plastic container. They did not require refrigerated storage, IIRC.

The dimensions of the crimped-on rim that remained once the lid was removed were carefully calculated and tested to NOT be a hazard to the oven's tube. Clever engineering let it warm properly without reflecting energy back into the Maggie, and destroying it...wonder how many tubes they blew out testing that idea?

Clever package design, but bland, lousy-tasting food...have not seen them on the market in a long time--think it was soup or something like that...
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Old 03-19-2018, 04:08 PM   #10
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The idea/invention of the microwave oven anecdotally came about as a radar-technician worked on a radar magnetron and noticed the chocolate bar in his shirt pocket melted.... hence, the brand-name "Radar-Range".

Aircraft mfr'd within the last 20 years have their weather radar units automatically switched to "non-transmit" mode when a switch on the landing gear detects the aircraft has landed. This is intended to belay hazards to workers on the airport and to prevent sparks in those nice, large, fuel trucks and other vehicles/airplanes on the ramp. (Prior to that recent improvement we had to remember to switch it off after landing so as to not fry the eyeballs and other organs of those who walked up to the plane to place chocks on the nose-gear-wheels.)
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Old 03-19-2018, 04:32 PM   #11
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Navy E-3 "Hawkeye" radar technicians know how to jumper the "squat switch" circuit if the aircraft is on the ground in hostile territory.

If one engine is running, the radar can be fired up and will kill anything within range of the beam. The cockpit and other windows in the aircraft are carefully shielded to keep the RF out of the cabin.

Not stuff you want to be around at very high power levels...they get well clear of the runway/aircraft carrier before firing that big 'Frisbee' antenna and transmitter up...
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Old 03-24-2018, 09:48 AM   #12
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...and the microwave oven makes a dandy place to store (with it off or unplugged) your sensitive radios and other items should an EMP or Carrington event CME strike. LOL. After an EMP not much is going to work except non electronic items so it is likely an exercise in futility. Our tow vehicles will probably be rendered doa.

Just some interesting trivia. As you were...
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Old 03-25-2018, 10:20 AM   #13
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Quote:
Originally Posted by Msherw View Post
...and the microwave oven makes a dandy place to store (with it off or unplugged) your sensitive radios and other items should an EMP or Carrington event CME strike. LOL. After an EMP not much is going to work except non electronic items so it is likely an exercise in futility. Our tow vehicles will probably be rendered doa.

Just some interesting trivia. As you were...

Really? What about the Faraday-Cage surrounding the electronics (which most folks refer to as the "body" of the vehicle.)

Yet another advantage of an Airstream over SOBs when the Sheet hits the Fans.)
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Old 03-25-2018, 12:32 PM   #14
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The glass in a microwave oven has perforated metal screens to prevent the escape (or ingress) of electromagnetic energy. Trailer and vehicle windows do not.

That said, if you are in the area of an EMP event, you likely have bigger problems than the survival of your electronics.

Al
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