[SI-LIST] Re: Honey, your conductors are ready!

  • From: Randy Dawson <rdawson16@xxxxxxxxxxx>
  • To: "rhaller@xxxxxxxxxxxxxxxxxxx" <rhaller@xxxxxxxxxxxxxxxxxxx>, "jwalden@xxxxxxxx" <jwalden@xxxxxxxx>
  • Date: Fri, 14 Nov 2014 12:55:47 -0800

Perhaps a better and less destructive test is to measure the wavelength of the 
oven with a chocolate bar.  Take out the turntable, and heat a chocolate bar 
for several seconds.  The melted spots give you the wavelength,  A 2.4GHz oven 
gives you about 4.5 inches between the spots.
Randy Dawson 

> From: rhaller@xxxxxxxxxxxxxxxxxxx
> To: jwalden@xxxxxxxx
> CC: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Honey, your conductors are ready!
> Date: Fri, 14 Nov 2014 20:06:43 +0000
> 
> I just read the experiment to my two daughters 18 and 25.
> The oldest one said, Dad, you don't have to be an engineer to know it's going 
> to ruin the microwave...
> LOL  my wife would never have done it...
> Regards
> Bob Haller
> 
> 
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
> Behalf Of Jeff Walden
> Sent: Thursday, November 13, 2014 5:25 PM
> Cc: si-list
> Subject: [SI-LIST] Re: Honey, your conductors are ready!
> 
> Slow day in China?
> Yuriy, the actual experiment might have really been, "what can I talk my wife 
> into doing"?
> 
> On Thu, Nov 13, 2014 at 4:46 PM, Yuriy Shlepnev <shlepnev@xxxxxxxxxxxxx>
> wrote:
> 
> > Jeff,
> >
> > I would rather do it in virtual reality :-) There is actually software
> > designed to simulate the heating process in microwave ovens - QWED
> > http://www.qwed.com.pl/examp_mheat.html
> >
> > Best regards,
> > Yuriy
> >
> > Yuriy Shlepnev, Ph.D.
> > President, Simberian Inc.
> > 3030 S Torrey Pines Dr. Las Vegas, NV 89146, USA Office
> > +1-702-876-2882; Fax +1-702-482-7903 Cell +1-206-409-2368; Virtual
> > +1-408-627-7706
> > Skype: shlepnev
> >
> > www.simberian.com
> > Simbeor - Accurate, Fast, Easy and Affordable Electromagnetic Signal
> > Integrity Software
> > 2010 and 2011 DesignVision Award Winner
> >
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> > [mailto:si-list-bounce@xxxxxxxxxxxxx]
> > On
> > Behalf Of Loyer, Jeff
> > Sent: Thursday, November 13, 2014 1:21 PM
> > To: si-list (si-list@xxxxxxxxxxxxx)
> > Subject: [SI-LIST] Honey, your conductors are ready!
> >
> > I thought you all might enjoy hearing the results from an experiment I
> > recently concocted (but haven't yet completed).  Here's how it was crafted:
> > Cut 2 identical squares of aluminum foil.  Shape one of those into a
> > ball, really tight and compressed (sphere = minimum surface area).
> > Leave the other one flat (maximum surface area).  Put them both in the
> > microwave and heat them for 15 seconds (not sure of exact time).  See
> > if there's a significant difference in the temperature between them.
> > The flat sheet should be much hotter - more surface area for the
> > microwaves to impinge upon.
> > Here's what I've learned from this exercise so far:
> >
> > 1)      Don't do this unless you're prepared to buy a new microwave, or can
> > live with lots of singe marks.
> >
> > 2)      If you blow the microwave circuit breaker, reset it quickly if you
> > have a freezer on the same circuit.
> >
> > 3)      Don't have your spouse try this while you're in business in China -
> > wait until you can do it properly.
> >
> > 4)      The foil has to be small enough not to contact the walls.
> >
> > As you can guess, I asked my spouse to try it.  I'm in China but was
> > anxious
> > to hear the results.  I should have waited! :-)   Here's the text from her
> > synopsis:
> >
> > "Well.  Our microwave looks like he[ck] - burned the door seal, and
> > put black streaks on the back wall.  My flat piece of foil was not a
> > square - it was a rectangle, so the edges grazed the sides of the box
> > insides as the tray rotated.  There was lots of arcing, sparking, and
> > color.  But as far as
> > Kath and I could tell, neither piece got warm!!!!   Go figure!
> > I could try again.  [note from Jeff: how did I find this woman?!?!] I
> > began with a rectangular piece approximately 4 inches by 6 inches.
> > Should have tried a square.
> > Had difficulty making a ball out of the one piece, after a certain
> > point of compressing it.  It was a little more of a prism than circular.  
> > But close.
> > We weren't clear if you wanted both pieces in the microwave at the
> > same time, or if the test should be run separately for 15 seconds.  We
> > (Kath and
> > I) decided to put them both in, beside each other, but not touching.
> > All the arcing activity caused the ball to roll under the rectangle, though.
> > At
> > least so it seemed.  The pieces were lightly stuck together when we
> > were done."
> >
> > Anyway, I still think it's a cool demonstration of the fundamental
> > principle that a layman can try (if they're brave or dumb).  There's a
> > nice limit that, if the sphere is small enough to equal the skin
> > depth, the two pieces will heat evenly (I think).  I'm anxious to try
> > it when I get home.
> >
> > If you choose to try this in the next week at the risk of your
> > microwave and food in your freezer, please let me know what you find.
> >
> > Cheers,
> > Jeff Loyer
> >
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> 
> --
> Jeffrey L Walden
> 
> EMC/SI RF analysis and product development http://www.linkedin.com/in/emcsirf
> jwalden@xxxxxxxx
> (866)547-5365
> 
> 
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