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High frequency (HF) is the ITU designation [1] for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).
High-frequency allocations are still designated for ships, although satellite systems have taken over some of the safety applications previously served by 500 kHz and other frequencies. 2182 kHz is a medium-wave frequency still used for marine emergency communication.
Extremely high frequency or commonly known as "EHF", is a large broadband that span a radius of about (30 GHz to 300 GHz) for the molecular spectra of radio frequencies. It lies between the super high frequency (3 GHz to 30 GHz) band and the far infrared band (300 GHz to 10 15), for which the lower part is the terahertz band.
The spectrum is divided into separate bands, with different names for the electromagnetic waves within each band. From low to high frequency these are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. The electromagnetic waves in each of these bands have different characteristics, such as how they are ...
Electromagnetic – cordless telephone frequency introduced in 2003 10 10: 10 GHz: 3 GHz to 30 GHz: Electromagnetic – super high frequency: 60 GHz: Electromagnetic – 60 GHz Wi-Fi (WiGig) introduced in 2010 10 11: 100 GHz 160.2 GHz: Electromagnetic – peak of cosmic microwave background radiation: 845 GHz: Fastest transistor (December 2006 ...
This prevents casual intruders from gaining access to, for example, encoded confidential information inside an embedded chip or other means of encoding. Technologies at this level include smart chips, magnetic strips, Radio Frequency Identification (RFID), contactless chips or smart chips with embedded identity and biometric data. With the ...
The following radio stations broadcast on AM frequency 1700 kHz: [1] 1700 AM is a Regional broadcast frequency. [2] It is the highest frequency allocated to the AM broadcast band in International Telecommunication Union (ITU) Region 2 (the Americas).
No doubt about the source's authenticity, trustworthiness, or competency. History of complete reliability. B: Usually reliable Minor doubts. History of mostly valid information. C: Fairly reliable Doubts. Provided valid information in the past. D: Not usually reliable Significant doubts. Provided valid information in the past. E: Unreliable