MICROWAVE OVEN FREQUENCIES : MICROWAVE WITH DROP DOWN DOOR.
Microwave Oven Frequencies
- microwave: kitchen appliance that cooks food by passing an electromagnetic wave through it; heat results from the absorption of energy by the water molecules in the food
- An oven that uses microwaves to cook or heat food
- A microwave oven, or simply a microwave, is a kitchen appliance that cooks or heats food by dielectric heating. This is accomplished by using microwave radiation to heat water and other polarized molecules within the food.
- An appliance for cooking food using microwave energy
- (frequency) the number of occurrences within a given time period; "the frequency of modulation was 40 cycles per second"; "the frequency of his seizures increased as he grew older"
- (frequency) the ratio of the number of observations in a statistical category to the total number of observations
- The fact of being frequent or happening often
- The ratio of the number of actual to possible occurrences of an event
- Frequencies was the debut album by the British techno act LFO, originally released in 1991 (see 1991 in music) by Warp in the UK and by Tommy Boy in the US.
- The rate at which something occurs or is repeated over a particular period of time or in a given sample
RF Microwave Meter by Sper Scientific
Qualifies for FREE Shipping
Evaluate the RF emissions of mobile phone, radio and TV transmission towers, wireless camera, Wi-Fi and LAN detection and installation, microwave oven leakage and other environmental safety concerns. Radio Frequency (RF) is the range of electromagnetic frequencies above the audio range and below infrared light. Features maximum and minimum hold, an audible alarm, and a zero adjustment to eliminate background EMF. The display also indicates overload and low battery. Comes with a soft carrying case and standard 9V battery, which provides approximately 100 hours of use. Dimensions: 5?" x 2?" x 1?" (130 x 56 x 38mm). Weight: 6oz (170g).
84% (17)
Blackberry -- Broken by design
Blackberries are fundamentally broken by design. That damned "Blackberry Buzz" is getting *this* close to me pitching the device.
It emits very high power pulsed RF when exchanging data with cell towers, and causes audio pickup and buzzing in ordinary audio devices. Bothersome and irritating, but also unusual for an ordinary transmitter. It takes a lot of emitted RF power to be picked up by ordinary audio devices. I'm definitely not one of the EMF fraidy-cat tinfoil hat freaks, but I do wonder what this does when a couple of inches from your brain or 'nads.
The Audacity screen shot above is the waveform captured by by computer: this is the sound that comes out of my computer speakers every few minutes if the damned blackberry is in the same room. The pulsed 217 Hz signal is characteristic to the GSM mobile phone standard, but my previous (Nokia 6133) GSM phone NEVER interfered with other equipment. The blackberry manufacturer's (R.I.M.) official statement is that it is not their fault: it's the fault of the audio device, since it isn't adequately shielded against the blackberry radiation. Uh... riiiight....
So I bothered enough to look in the safety manual. Bear in mind lawyers have had their way with this, but it's still scary:
Radio frequency (RF) signals might affect improperly installed or inadequately shielded electronic systems in motor vehicles. (You mean, systems designed and installed before somebody decided high-power RF sources inside motor vehicles would be a neat idea?)
Always keep the BlackBerry device more than 7.88 inches (20 cm) from a pacemaker when the BlackBerry device is turned on. (uh, or else what?)
Turn off all wireless connections on the BlackBerry device in health care facilities. (Must be those pacemakers!)
Do not use the phone on the BlackBerry® device to report a gas leak in the vicinity of the leak. (BOOM!)
To avoid interfering with blasting operations, turn off all wireless connections on the BlackBerry device when in a “blasting area”. (Cue John Cleese: "Oh! Sorry!")
If you do not use a holster equipped with an integrated belt clip supplied or approved by RIM when you carry the BlackBerry device, keep the BlackBerry device at least 0.98 inches (25 mm) from your body when the BlackBerry device is turned on. Carrying solutions that do not come equipped with an integrated belt clip SHOULD NOT be worn or carried on the body. (OK, that's it. It's never going in my pocket again. But I refuse to wear a goofy holster. I guess I'll have to leave it in my backpack or at home. *sob*)
Incidentally, the Blackberry is measured to deposit 1.51 watts of heat per gram of tissue, "well" below the "safe" value of 1.6 watts per gram, the manual states. Interestingly, 1.5 watts per gram is HIGHER than when I use a 1200 watt kettle to boil a liter of water...
The compliance statement:
FCC compliance statement (United States)
FCC Class B Part 15
This device complies with Part 15 of the Federal Communications Commission (FCC) Rules.
Operation is subject to the following two conditions:
- This device may not cause harmful interference. (Uh, FAIL!)
- This device must accept any interference received, including interference that may cause
undesired operation. (Hmm. Let's try it in the microwave oven.)
Other (non-radio) considerations:
Exposure to flashing lights on the BlackBerry device can cause epileptic seizures or blackouts and might be dangerous to you or others. (Oh! So that explains those lost time periods. Thank goodness. I thought those memory lapses were because of the UFO aliens.)
When using the BlackBerry device, take frequent breaks. If you experience
any discomfort in your neck, shoulders, arms, wrists, hands (including thumbs and fingers), or
other parts of the body when using the BlackBerry device, cease use immediately. (uh... what do they know that they aren't telling us?)
Results
The pattern on the marshmallows
We know that c = frequency * wavelength
The wavelength is the distance between burned spots in the marshmallow plate. This can be measured from figure 3 to be 0.11m +- .01m
For frequency we cheat and look at the back of the microwave oven - see figure 4. Microwave ovens work at 2450MHz, the middle of the ISM band. Funny that, I suppose it's what the ISM bands were originally intended for!
So c = 3.21 +- 0.5 * 10^8 m/s
That's close enough to the published value :)
microwave oven frequencies
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SIZE: 9" x 9",MATERIAL: Dura-Plastic
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