Question about Garmin Gmu 44 Magnetometer P/n 011-00870-00

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What are the applications of very low frequency electromagnetics?

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Very low frequency electromagnetics is used in mineral exploration and water exploration. In the air VLF is used with it's airborne optically pumped gradiometer magnetometer systems.

Posted on Jul 31, 2013

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Posted on Jan 02, 2017

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I have solar panels / solar invertor with a battery backup. I am getting a lot of line disturbances. Will EMI filters help??


Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.


Having harmonic disturbance problems?
Thinking about Power Quality?
Having harmonic disturbance problems?
Check out Enerdoor's Harmonic Filter series!
Ex: http://www.enerdoor.com/news/view/thinking-about-power-quality

Jul 17, 2017 | Solar Computers & Internet

1 Answer

Can a dvd player be used as an antenna


No. An antenna is a "tuned" device used to radiate or receive electromagnetic signals. Its length and shape is a function of the electromagnetic signal frequencies it is designed to radiate or receive. An antenna is designed to "resonate" at its operating frequency for greatest efficiency. A DVD player is not an antenna. It is not designed to radiaite or receive electromagnetic signals. However, it generates electromagnetic signals by decoding information from a spinning DVD disk. Antennas do not "generate" signals. Antennas only convey signals.

May 02, 2014 | Televison & Video

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FRS 2Way Radio 14 Channel Conair Expedition MODEL FRS200SLV MANUAL


Here is some information that might help.
Range can vary due to topographical and atmospheric conditions. Voice transmissions on some channels are not permitted by law.
Use in DUPLEX mode, Repeater stations can re-transmit your signal over a wider area giving you extended range depending on the location, height and availability of the local repeater station.

For information on the locations of repeater sites in your area visit the manufactures website or look-up UHF channels and frequencies for your area.
Note: some channels / Frequency's are to be Avoided.
UHF Repeater operation is used when long distance communication is required, unless specifically needed use of the repeater channels is to be avoided. Some channels and emergency channels, some are calling channels for establishing communication and some are customary road vehicle channels.
You will need to look these channels up for your Area.

Other stuff on this subject on safety and safe operation.
Electromagnetic Interference/Compatibility
Nearly every electronic device is susceptible to electromagnetic interference (EMI). To avoid the possibility of electromagnetic interference and/or compatibility conflicts, turn off your radio in any location where posted notices instruct you to do so such as healthcaer facilities.

Feb 06, 2014 | Radio Communications

2 Answers

What is UV light?


UV (ultraviolet) light is, according to Wikipedia, "electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays"
"It is so-named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the color violet. These frequencies are invisible to humans, but visible to a number of insects and birds." (wikipedia)

Jul 16, 2013 | Electronics - Others

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What are the applications of a band pass and low pass filters?


A "band pass" filter attenuates all frequencies except those in its specified range. A "low pass" filter attenuates frequencies above a specified frequency (permitting only lower frequencies to "pass"). A "high pass" filter attenuates frequencies below a specified frequency (permitting only higher frequencies to "pass").

For example, a "band pass" filter rated for 500MHz-4GHz will effectively eliminate all frequencies below 500MHz and all frequencies above 4GHz. A "low pass" filter rated at 10KHz will effectively eliminate all frequencies that are above 10KHz. A "high pass" filter rated at 70Hz will effectively eliminate all frequencies that are below 70Hz.

Jul 25, 2011 | Computers & Internet

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How does the electromagnetic spectrum work?


The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation.[1] The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.
The electromagnetic spectrum extends from low frequencies used for modern radio to gamma radiation at the short-wavelength end, covering wavelengths from thousands of kilometers down to a fraction of the size of an atom. The long wavelength limit is the size of the universe itself, while it is thought that the short wavelength limit is in the vicinity of the Planck length, although in principle the spectrum is infinite and continuous. Hope this helps.

Feb 26, 2011 | Refrigerators

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Getting disconnected


Need more INFO... getting disconnected from what ??? the LAN (Local Aria Network) or the WAN (Wide Aria Network) ???, in other words do you loose network connectivity or internet connectivity ???, is it trough wired or wireless connection ???, if it's wired LAN connectivity, check/change the cable from the router to the computer, if it's wired WAN connectivity, check/change the cable from the router to the ISP's modem, if it's trough wireless check for RFI (Radio Frequency Interference) or EMI (electromagnetic interference) move the unit away from any electrical device or radio transmitters, change the frequency of the unit to an other frequency than the default one, etc...

Good luck!

Feb 09, 2011 | Computers & Internet

1 Answer

Want answer about a short note on Electromagnetic spectrum


The electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength. The sun, earth, and other bodies radiate electromagnetic energy of varying wavelengths. Electromagnetic energy passes through space at the speed of light in the form of sinusoidal waves. The wavelength is the distance from wavecrest to wavecrest.

Nov 28, 2010 | Computers & Internet

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What is the sorce of radiowaves


Radio waves are electromagnetic waves occurring on the radio frequency portion of the electromagnetic spectrum, with the range of about 3 Hz to 300 GHz.

Like all electromagnetic waves, radio waves are produced by exited electrons when they return to their normal state. Radio waves can be made to carry information by varying a combination of the amplitude, frequency and phase of the wave within a frequency band.

When electromagnetic radiation impinges upon a conductor, it couples to the conductor, travels along it, and induces an electric current on the surface of that conductor by exciting the electrons of the conducting material. This effect (the skin effect) is used in antennas. Electromagnetic radiation may also cause certain molecules to absorb energy and thus to heat up; this is exploited in microwave ovens. Source(s): wikipedia

Nov 25, 2010 | Computers & Internet

2 Answers

School project


When you talk into the microphone your voice which is sound pressure is converted to electrical voltages then it is increased in power to about half of the power of what the CB will sen out to the antenna. To make the CB radio transmit, there is a circuit that creates the proper frequency or channel. It is then increased to about twice the power of the voice circuit. They are combined together just before it goes into the antenna.It leaves the radio and goes into the antenna where it leaves the antenna as an electromagnetic wave. Electricity in the air with a certain value of frequency and strength. When the CB receives, The antenna picks up a signal, an electromagnetic wave, as it passes by. The electromagnetic wave, which is a small voltage, with a certain frequency and strength, enters the radio where it is processed . It is then increased in power . It is now connected to a speaker. The speaker is also a converter. It converts electrical voltage back to sound pressure so we can hear it. As the electrical voltages make the cone of the speaker move in and out. There is a lot more detail than this but this should help. Many things happen inside the radio that cant be explained in a few paragraphs.

May 14, 2008 | Cobra 29 LTD CB Radio

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