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Topic: VHF

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Very high frequency

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	Very high frequency - Wikipedia, the free encyclopedia
		Common uses for VHF are FM radio broadcast at 88–108 MHz and television broadcast (together with UHF).
		VHF range is a function of transmitter power, receiver sensitivity, and the distance to the horizon, since VHF signals propagate under normal conditions as a line-of-sight phenomenon.
		The VHF TV band in Australia was originally allocated channels 1 to 10 - with the 2, 7 and 9 frequencies assigned for the initial services in Sydney and Melbourne, and later the same frequencies would be assigned in Brisbane, Adelaide and Perth.
	en.wikipedia.org /wiki/VHF (1481 words)

	Encyclopedia :: encyclopedia : VHF omnidirectional range (Site not responding. Last check: 2007-10-22)
		VORs broadcast a VHF radio signal encoding both the identity of the station and the angle to it, telling the pilot in what direction he lies from the VOR station, referred to as the radial.
		Each VOR operates on a radio frequency assigned to it between 108.0 megahertz (MHz) and 117.95 MHz, which is in the VHF (very high frequency) range.
		VHF was selected because it travels only in straight lines, resisting bending due to atmospheric effects, thereby making angle measurements accurate.
	www.hallencyclopedia.com /VHF_omnidirectional_range (1920 words)

	VHF ( Very High Frequency) (Site not responding. Last check: 2007-10-22)
		The VHF spectrum is defined as the part of the electromagnetic spectrum which includes any radiation with a wavelength between 1 and 10 metres and a frequency between 30 and 300 megahertz.
		VHF signals are widely employed for television and radio transmissions.
		VHF electromagnetic waves, unlike longer electromagnetic waves, are not strongly reflected from the atmosphere; therefore, they do not bend readily around the Earth's curvature and cannot be transmitted beyond the horizon.
	safety.inmarsat.com /vhf.htm?language=EN&textonly=False (444 words)

	BoatUS BoatTECH Guides: VHF Radios
		VHF is a line-of-sight system, which means the radio waves won't bend to follow the curvature of the earth.
		Unlike VHF radios, SSBs require a large ground plane in order to radiate its signal which except on metal hulls, needs to be installed in the form of a large copper mesh panel (sometimes built onto the fiberglass hull).
		VHFs are handy in an emergency, but they have other uses: telephone calls to shore, obtaining supplies and services such as marina reservations, and boat operations like drawbridge openings and communicating with commercial and other recreational vessels.
	www.boatus.com /boattech/vhf.htm (1409 words)

	VHF Radio FAQ
		On all Shakespeare VHF Marine antennas the beam width is between 24 and 26 degrees.
		VHF antennas come in gain categories, like 3-dB, 9-dB, etc., which are a measure of how efficiently the antenna deals with the signal it is fed from the radio.
		Handheld VHF's are limited to a maximun of six wattsoutput, compared to a fixed mount unit's 25 watts, but it should be noted that antenna height limits VHF range more than wattage.
	www.catfleet21.org /rigging/June.htm (2040 words)

	Australian Antarctic Division - The Davis VHF radar
		VHF radars (otherwise known as Mesosphere-Stratosphere-Troposphere or MST radars) are used to measure wind speed and direction over a wide range of heights in the middle atmosphere.
		The wind plays a critical role in the state of the atmosphere: It is the wind that makes the summer polar mesosphere (near 86 km in altitude) the coldest region of the earth’s environment at around -130°C, and it is the spring-time wind that holds the ozone hole together.
		It was found that the VHF radar return from this part of the atmosphere was much stronger than at other times of the year.
	www.aad.gov.au /?casid=11405 (504 words)

	OSMB - VHF Radios (Site not responding. Last check: 2007-10-22)
		VHF Marine Radios provide many more advantages to the boater than CB radios or cell phones.
		VHF signal is locatable: Even if you're lost in the fog, the Coast Guard can locate you by the VHF signal from your radio.
		An ideal combination is a mounted VHF radio with a hand-held as a back-up.
	www.marinebd.osmb.state.or.us /Safety/VHFradios.html (703 words)

	VHF BLR & RASS
		VHF radars in the past have been used to mainly measure winds to as high as possible in the atmosphere.
		The longer wavelength VHF radars are not susceptible to bird echoes.
		The acoustic frequencies used for the VHF RASS are lower giving much less attenuation as they travel but tend to have larger beamwidths than for UHF.
	www.physics.adelaide.edu.au /atmospheric/bl.html (581 words)

	Garmin: VHF 725 (Site not responding. Last check: 2007-10-22)
		Garmin® made the VHF 725 waterproof so that constant saltwater spray or an accidental dunk in the bait well won't dampen its performance.
		Additionally, a backlit display and keypad make it a breeze to operate the VHF 725 in the dark, while all of the unit's key functions—including squelch, volume adjustment, channel selection, weather alert, and Tri-Watch monitoring—are accessible by the waterproof keypad.
		The Garmin VHF 725: A hardworking marine radio that's definitely not afraid of the water.
	www.garmin.com /products/vhf725 (171 words)

	Wavelength Training (VHF) (Site not responding. Last check: 2007-10-22)
		With a vhf radio you can talk to other boats, the Coastguard etc and often a minor mishap can be prevented from turning into a major distress alert by simply talking to people over the radio.
		With vhf the coastguard and lifeboats can find you even when you do not know where you are by homing in onto your radio signal.
		Also covered is the new generation of vhf radios incorporating digital selective calling to other vessels and push button distress calling - one push of the button and your position, identity, and nature of distress is sent in a one digital burst.
	www.wavelengthtraining.co.uk /vhf.htm (284 words)

	VHF omnidirectional range - Free net encyclopedia (Site not responding. Last check: 2007-10-22)
		This article is about the radio navigation aid, see vestibulo-ocular reflex for the important eye movement that has provided insight into cerebellum-dependent motor learning.
		Image:D-VOR PEK.JPG VOR, short for VHF Omni-directional Radio Range, is a type of radio navigation system for aircraft.
		The Local Area Augmentation System is planned to use the same VHF frequency band for its correction message.
	www.netipedia.com /index.php/VHF_omnidirectional_range (2020 words)

	UTARC - N5XU VHF/UHF Station (Site not responding. Last check: 2007-10-22)
		Amplifiers and power supplies, which generally do not require adjustment after they are turned on and plugged in, are all located to one side, out of the way.
		During VHF contests, there is still sufficient room for two operators to sit at the table, usually one to operate the six meter radio, and another to operate the other radios.
		The HF radio is a Realistic HTX-100, a 10 meter mono-band mobile radio that became popular during the peak of the last solar cycle.
	n5xu.ae.utexas.edu /n5xu/vhf.shtml (1077 words)

	VHF
		"VHF have produced music of rare democratic brilliance, a music that eschews virtuosity in favour of a group aesthetic.
		He is currently a member of +minus, VHF and a trio with Eddie Prévost and Mark Wastell.
		His primary influences are the music and writing of Morton Feldman, the experimentation of Alvin Lucier, Pierre Schaeffer and Eliane Radigue, and the visual art of the American Abstract Expressionists.
	www.brucesfingers.co.uk /publicity/vhf/vhf.html (557 words)

	Ohio DNR Div. of Watercraft: Ohio River Boating: VHF Radio Use (Site not responding. Last check: 2007-10-22)
		The Division of Watercraft encourages all boaters using the Ohio River to install a VHF radio in their watercraft.
		The VHF radio may produce a vital link in obtaining help in the event of an "on-the-water" emergency.
		For normal radio operation: Select Channel 9 (a recognized hailing channel), state the name of the vessel you are attempting to contact, then your vessel's name and call numbers once; when the other craft responds, switch to another channel to talk.
	www.dnr.state.oh.us /watercraft/boat/ohriver/vhf.htm (360 words)

	VHF - a definition from Whatis.com - see also: very high frequency
		In the VHF band, electromagnetic fields are affected by the earth's ionosphere and troposphere.
		Auroral, meteor-scatter, and EME (earth-moon-earth, also called moonbounce) propagation take place on occasion, but these modes do not offer reliable communication and are of interest primarily to amateur radio operators.
		The VHF band is popular for mobile two-way radio communication.
	searchnetworking.techtarget.com /sDefinition/0,,sid7_gci506990,00.html (332 words)

	VHF omnidirectional range (Site not responding. Last check: 2007-10-22)
		A more accurate D-VOR (Differential VOR) ground station, co-located with [[DME.]] VOR, short for VHF Omni-directional Range, is a type of radio navigation system for aircraft.
		Oddly the airways have become so important to air traffic control that aircraft are forced to follow them even when they are using GPS for navigation.
		However this also means that the signals do not operate "over the horizon", VOR is line-of-sight only, limiting the operating radius to 160 km.
	vhf-omnidirectional-range.kiwiki.homeip.net (1916 words)

	Pat's Boating in Canada: VHF Marine Radio (Site not responding. Last check: 2007-10-22)
		VHF radio licence: Licences for a ship's VHF radio station may be exempted for recreational boat radios.
		New boats are now being sold with VHF radios as standard equipment, sending people onto the water without a proper operator's licence which would at least ensure they know basic radio procedure.
		Once a vessel has responded to your call, you must move to one of the VHF working channels authorized for pleasure boats to continue.
	boating.ncf.ca /vhf.html (1197 words)

	WA VHF Group - View Document
		The West Australian V.H.F. Group (Incorporated) is based in Perth, and is the single largest license holder and operator of terrestrial VHF, UHF and SHF beacons in Australia.
		The co-ordinated, long-term investigation of VHF (and higher frequency) radio propagation has resulted in a greater understanding of anomalous propagation; the models developed in the Amateur Service have been used to identify the source and propagation mechanism of sporadic co-channel interference to Emergency Services’ VHF communications, and to develop mitigation strategies.
		The WA VHF Group views the Amateur Service as providing an invaluable resource for the development of leading edge skills and technologies in the field of radio propagation and channel coding mechanisms.
	vhf.worldsbest.com.au (271 words)

	VHF Antennas : Antennas: VHF UHF
		Quarter Wave with radials - VHF quarter wave antenna mainly for scanner usage, The quarter wave antenna is an easily designed and constructed antenna for whatever frequency you want, although with the following design, you may to limit it to the VHF and UHF bands due to the physical size.
		Shrunken Quad - VHF quad antenna for transmitter hunting.
		VHF TX Loop - VHF Antenna in a lunchbox.
	www.dxzone.com /catalog/Antennas/VHF_UHF (2077 words)

	HDTVi UHF/VHF Indoor Antenna
		The solution is a quality indoor antenna, which can pick up all local HDTV channels; one that will look great next to your television and one that is easy to install.
		The Terk HDTVi is the only indoor HDTV antenna optimized for both UHF and VHF reception (channels 2-69).
		It is tuned for optimal HDTV reception with a unique design that utilizes elements and dipoles for receiving both UHF and VHF HDTV broadcasts, allowing you to receive more stations.
	www.smarthome.com /7744hi.html (302 words)

	ipedia.com: Ultra high frequency Article (Site not responding. Last check: 2007-10-22)
		UHF and VHF are the most common frequency bands for television.
		UHF frequencies have higher attenuation from atmospheric moisture and benefit less from 'bounce', or the reflection of signals off the ionosphere back to earth, when compared to VHF frequencies.
		A drawback to this is the very large number of small relay transmitters needed to fill in gaps in the main transmitters' coverage, which would not have been necessary wth a VHF system due to its different propagation characteristics.
	www.ipedia.com /ultra_high_frequency.html (500 words)

	Open Directory - Recreation: Radio: Amateur: VHF (Site not responding. Last check: 2007-10-22)
		DK5YA VHF: The World of DX Above 50 Mhz - 50 and 144 Mhz news, Aurora information, clubs and groups, moonbouncing, expeditions, hardware, forum, meteorscatter, satellites, software, solar and tropo weather news.
		VHF UHF Contesters - W9ICE Indianapolis Carmel Experimenters.
		VHF and UHF QRP operation - Contains 2m, 70cm and 23cm logs, PIC guidance and details of Sheffield's sewer gas destructor lamps.
	dmoz.org /Recreation/Radio/Amateur/VHF (1551 words)

	B-VHF :: Broadband VHF Platform (Site not responding. Last check: 2007-10-22)
		The prime goal of the B-VHF project is to verify the feasibility of a broadband VHF aeronautical communications system based on the MC-CDMA technology and to demonstrate its benefits to the aeronautical community.
		As a modern full-digital system, it will provide sufficient capacity and fulfil security and safety requirements for future voice and data services at affordable cost, while increasing overall spectral efficiency of aeronautical VHF communications.
		This programme is 50% funded by the European Commission under Framework 6.
	www.b-vhf.org /b-vhf (94 words)

	VHF omnidirectional range \| TutorGig.co.uk Encyclopedia (Site not responding. Last check: 2007-10-22)
		'VOR', de sus siglas en ingles VHF Omni-directional Radio Range, is a type of radio navigation system for aircraft.
		Popular Music See all 219 results in VHF omnidirectional range..
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	www.tutorgig.co.uk /ed/VHF_omnidirectional_range (2057 words)

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