High-Frequency Transmit
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High Frequency Active Auroral Research Program — HAARP is often confused with Project HARP, the High Altitude Research Project (a joint project of The Pentagon and the Canadian Department of National Defence).The High Frequency Active Auroral Research Program (HAARP) is an investigation project … Wikipedia
Ultra high frequency — (UHF) designates a range (band) of electromagnetic waves with frequencies between 300 MHz and 3 GHz (3,000 MHz). Also known as the decimeter band or decimeter wave as the wavelengths range from ten to one decimeters. Radio waves with frequencies… … Wikipedia
Extremely high frequency — Frequency range 30 to 300 GHz ITU Radio Band Numbers 1 2 3 4 5 6 7 8 9 10 … Wikipedia
Very high frequency — (VHF) is the radio frequency range from 30 MHz to 300 MHz. Frequencies immediately below VHF are denoted High frequency (HF), and the next higher frequencies are known as Ultra high frequency (UHF). The frequency allocation is done by ITU. Common … Wikipedia
ultra high frequency — noun 1. any radiofrequency between 300 and 3000 megahertz. Abbrev.: UHF –adjective 2. (of a device) designed to transmit or receive such a frequency …
Frequency modulation — See also: Amplitude modulation In telecommunications, frequency modulation (FM) conveys information over a carrier wave by varying its frequency (contrast this with amplitude modulation, in which the amplitude of the carrier is varied while its… … Wikipedia
Frequency range — A frequency range or frequency band is a range of wave frequencies. It most often refers to either a range of frequencies in sound or a range of frequencies in electromagnetic radiation, which includes light and radio waves. Many radio devices… … Wikipedia
Transmit-after-receive time delay — In telecommunication, transmit after receive time delay is the time interval from removal of rf energy at the local receiver input until the local transmitter is automatically keyed on and the transmitted rf signal amplitude has increased to 90%… … Wikipedia
High-speed multimedia radio — (HSMM), colloquially referred to as the hinternet , is the implementation of wireless data networks over amateur radio frequencies using commercial off the shelf (COTS) hardware such as 802.11 access points and D Star equipment. Licensed amateur… … Wikipedia
high-passfilter — high pass filter (hīʹpăsʹ) n. A filter designed to transmit electromagnetic frequencies above a certain value, while excluding those of a lower frequency. * * * … Universalium
Frequency-shift keying — Passband modulation v · d · e Analog modulation AM · … Wikipedia
