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High frequency (HF) radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters (ten to one hundred metres). Frequencies immediately below HF are denoted Medium-frequency (MF), and the next higher frequencies are known as Very high frequency (VHF). Shortwave (2.310 - 25.820 MHz) overlaps and is slightly lower than HF.

High frequency Video

HAARP (High-Frequency Active Auroral Research Program). THE "Weapon of Mass Destruction". It is the source of artificial weather changes (such as TORNADOS, droughts, floodings, cyclones and tsunamis) and also EARTHQUAKES. Not only that, but the waves that travel into the depths of the ocean heavily hurt and can kill water species, including whales and dolphins. Find more about HAARP now! YouTube it. - FromSoraya
4.37 min. | 4.60 user rating		 HAARP (High Frequency Active Auroral Reasearch Program). Supposed Weather modification, communication disruption and mind control Weapon. Extended Star Wars Defense Initiative (SDI)weapon of the US military. HAARP has the ability of modifying the World's electro-magnetic field.
10.47 min. | 4.81 user rating		 Adults can't hear this ringtone. Trust me, they WON'T BE ABLE TO. It's at a really high frequency, so that's why it only works for teenagers. Try it yourself and see if you can hear it.
1.20 min. | 2.05 user rating		 Sing and Groove's song to help students learn high frequency words.
1.77 min. | 4.69 user rating		 This is a little test made by www.WTF5.com that will show you if you are capable of hearing the annoying teen repelant mosquito sound. The mosquit sound is played at various levels ranging from 30 khz to 10 khz. 99% of the population will be able to hear the sound around 15 khz. Take the test and find out if the Teen repeler repel mosquito machine would work on you. We have tested 2 models of the mosquito machine and it worked quite well. Recent story had teenagers almost rioting a local movie theater. Kids and teens are starting to use the sound as a secret ringtone. Websites are popping up showing people how to make similiar mosquito devices. Common Searches for the Mosquito Device: Mosquito device Mosquito high frequency machine Mosquito high pitch Mosquito repel Mosquito kid repelant Sound that annoys kids Sound that annoys teens How to make the mosquito sound Funny mosquito sound trick Using the mosquito in class
0.72 min. | 1.86 user rating
www.manythings.org Vocabulary & American English Pronunciation Practice. Do this for each word. 1. Read and say the word. 2. Listen and repeat it. 3. Listen and repeat it again. 4. Listen and repeat it again. Within the high frequency words, 2-syllable words are more often accented on the first syllable. If you read Japanese, you can see the meaning of each word during steps 3 and 4. However, you don't need to be able to read Japanese to use this video for reading practice and pronunciation practice. è±åèªã®çºé³ç·´ç¿ è±èªã®åå¼·===================== www.manythings.org American English Pronunciation Practice ã±ãªã¼åå¼ã®ã¤ã³ã¿ã¼ãããä¸ã®è±èªææwww.manythings.org ===================== Category: Education Tags: ESL EFL English Study ESOL TESOL TESL TEFL vocabulary listen and repeat pronunciation high-frequency words 2-syllable American accent reduction remedial reading è±ä¼è©± è±èª çºé³ è±èªææ è±èªã®çºé³ çºé³ç·´ç¿
9.38 min. | 5.0 user rating		 infoshop.index-werke.de stores.ebay.de Durch die patentierte Kombination eines mechanischen Getriebes mit einer Generator/Motor-Einheit, stoÃen unsere Hochfrequenz-Spindeleinheiten auf einer CNC-Drehmaschine in bisher unerreichte Drehzahldimensionen vor (bis zu 60.000 1/min bei einer Ãbersetzung von 0,1). Unsere Hochfrequenz-Spindeleinheiten bieten eine Vielzahl von Vorteilen gegenüber herkömmlichen Hochfrequenz-Lösungen. * kurze Rüstzeiten, ohne störende zusätzliche Verkabelung zur Energieversorgung und Steuerung * universell einsetzbar auf allen Werkzeugträgern * deutlich kürzere Stückzeiten auf Grund des hohen Zerspanvolumens durch die hohe Schnittgeschwindigkeit * sehr wirtschaftlich, da vergleichsweise kostengünstig gegenüber konventionellen Hochfrequenz-Lösungen Speziell bei der Verwendung von kleinen Werkzeugen, ergeben sich daraus völlig neue Bearbeitungsmöglichkeiten mit einer bestechenden Oberflächenqualität. Anwendungsbeispiele: -Oberflächenfinisch von medizinischen Instrumenten -Fräsen des TORX-Profils in Schraubenköpfe -Bohren von Mikrolöchern und wirbeln von Innengewinden -Gravieren (signieren) der Prägeform von Stempeln www.index-werke.de ENGLISH: The patented combination of a mechanical gear and a generator/ motor-unit takes our High Frequency Spindle Units on a CNC lathe to an unsurpassed speed level. Our High Frequency Spindle Units offer a wide range of advantages compared to conventional high frequency solutions: ⢠reduced setup times, without <b>...</b>
0.75 min. | 4.90 user rating		 www.manythings.org Vocabulary & American English Pronunciation Practice. Do this for each word. 1. Read and say the word. 2. Listen and repeat it. 3. Listen and repeat it again. 4. Listen and repeat it again. Within the high frequency words, 2-syllable words are more often accented on the first syllable. If you read Japanese, you can see the meaning of each word during steps 3 and 4. However, you don't need to be able to read Japanese to use this video for reading practice and pronunciation practice. è±åèªã®çºé³ç·´ç¿ è±èªã®åå¼·===================== www.manythings.org American English Pronunciation Practice ã±ãªã¼åå¼ã®ã¤ã³ã¿ã¼ãããä¸ã®è±èªææwww.manythings.org =====================
9.95 min. | 4.46 user rating		 NOTICE: as of 31.03.2011 I have noticed a lot of "Stan Meyer fanboys" and other people commenting, who may be a little bit confused about this video, so I have gone to the trouble of creating this notice for their education... The graphical content of this video is not a replication of Stan Meyers work in any way, and doesn't claim to be a free energy machine or over-unity device. This work is of my own creation, and the idea is open to all who may be willing to use it for their benefit or interests. Please don't be confused and post irrelevant comments about Stan Meyer, as this video is not about his work. I have seen his work just to make people aware, so I do not need the suggestions to see his work thanks. Anyway, onto the more important matters - this video. This video was made to illustrate the effects of possible injection of high frequency AC current and voltage across the plates of the HHO cell. This may be either from a DC square wave with changing duty cycle, or sine wave, from a power oscillator or inverter drive. In my initial idea, tests were planned to be carried out using a home-made inverter, with adjustable output voltage and frequency. A current transformer would be used to measure the line current and a graph would have been plotted against frequency and current, another would have covered frequency and cell voltage. However I have not done either due to other commitments. The whole idea is to use the cell as a capacitor, and then add a custom inductor <b>...</b>
0.28 min. | 4.12 user rating		 The Time Frequency live at the Metro Nightclub There can only be one
4.97 min. | 4.83 user rating

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Federal Government Asks for Closed Courtroom to Protect Goldman Sachs Secrets - AllGov Tweet this news
AllGov--Sergey Aleynikov was arrested by the FBI on charges of stealing computer code that supports Goldman's -high frequency- trading system, which allows the bank ... - Date : Fri, 29 Oct 2010 12:06:48 GMT+00:00
Trading Places - U.S. News & World Report Tweet this news
U.S. News & World Report--By buying or selling shares split seconds ahead of the rest of the market, holding stock for mere moments and then doing it all again, -high---frequency- ... - Date : Mon, 01 Nov 2010 15:08:54 GMT+00:00
Algorithmic Trading: Higher than human - Moneycontrol.com Tweet this news
Moneycontrol.com--Will -High Frequency- Trading make markets more efficient? Or will it lead to unforeseen problems? In India, the debate is far ... - Date : Mon, 01 Nov 2010 04:35:19 GMT+00:00

Electromagnetic spectrum

Visible (optical)Violet * Blue * Green * Yellow * Orange * Red
MicrowavesW band * V band * Q band * Ka band * K band * Ku band * X band * S band * C band * L band
RadioEHF * SHF * UHF * VHF * HF * MF * LF * VLF * ULF * SLF * ELF
Wavelength typesMicrowave * Shortwave * Medium wave * Longwave



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