Television antenna Wikipedia. A Winegard 6. 8 element VHFUHF aerial antenna. This common multi band antenna type uses a UHF yagi at the front and a VHF log periodic at the back coupled together. A television antenna, or TV aerial, is an antenna specifically designed for the reception of over the air broadcast televisionsignals, which are transmitted at frequencies from about 4. MHz in the VHF band, and 4. MHz in the UHF band in different countries. Television antennas are manufactured in two different types indoor antennas, to be located on top of or next to the television set, and outdoor antennas, mounted on a mast on top of the owners house. Booker T Green Onions Download Music. They can also be mounted in a loft or attic, where the dry conditions and increased elevation are advantageous for reception and antenna longevity. Outdoor antennas are more expensive and difficult to install, but are necessary for adequate reception in fringe areas far from television stations. The most common types of indoor antennas are the dipole1 rabbit ears and loop antennas, and for outdoor antennas the yagi,1log periodic,1 and for UHF channels the multi bay reflective array antenna. DescriptioneditIn most countries, television broadcasting is allowed in the very high frequency VHF band from 4. Download the free trial version below to get started. Doubleclick the downloaded file to install the software. You can meet all emissions requirements and get the high flow needed for your engine to reach its full potential with a performance catalytic converter. Catalytic Exhaust Products manufacture a full line of high flow diesel catalytic converters, as well as exhaust cleaners, purifiers, scrubbers for different types of. MHz, called VHF low band or band I in Europe 1. MHz, called VHF high band or band III in Europe, and in the ultrahigh frequency UHF band from 4. MHz, called band IV and V in Europe. The boundaries of each band vary somewhat in different countries. High To Low Converter Installation Forest' title='High To Low Converter Installation Forest' />To cover this range, antennas generally consist of multiple conductors of different lengths depending on the wavelength of the radio waves they receive. The elements of most antennas are half wave dipoles metal rods half the wavelength of the signal they are intended to receive. The wavelength of a signal equals the speed of light c divided by the frequency. The above range of frequencies is too wide to be covered by a single antenna, so often separate antennas for the VHF and UHF bands are used or a combined antenna that has both VHF and UHF elements mounted on the same boom. During the last decade many countries in the world switched from broadcasting using an older analog television standard to newer digital television DTV. However generally the same broadcast frequencies are used, so the same antennas used for the older analog television will also receive the new DTV broadcasts. Sellers often claim to supply a special digital or high definition television HDTV antenna advised as a replacement for an existing analog television antenna at best this is misinformation to generate sales of unneeded equipment,23 at worst it may leave the viewer with a UHF only antenna in a local market particularly in North America where some digital stations remain on their original high VHF frequencies. Very common rabbit ears indoor antenna. This model also has a loop antenna for UHF reception. Indoor antennas may be mounted on the television itself or stand on a table next to it, connected to the television by a short feedline. Due to space constraints indoor antennas cannot be as large and elaborate as outdoor antennas, and they are not mounted at as high an elevation for these reasons indoor antennas generally do not give as good reception as outdoor antennas. They are often perfectly adequate in urban and suburban areas which are usually within the strong radiation footprint of local television stations, but in rural fringe reception areas only an outdoor antenna may give adequate reception. A few of the simplest indoor antennas are described below, but a great variety of designs and types exist. Many have a dial on the antenna with a number of different settings to alter the antennas reception pattern. This should be rotated with the set on while looking at the screen, until the best picture is obtained. Rabbit earseditThe oldest and most widely used indoor antenna is the rabbit ears or bunny ears, which are often provided with new television sets. It is a simple half wave dipole antenna used to receive the VHF television bands, consisting in the US of 5. MHz band I and 1. MHz band III, with wavelengths of 5. Largest Selection of Electric Motors Controllers in the World, for the Golf Cart Aftermarket. Heavy Duty High Speed High Torque Motors for Electric Golf Carts. Last updated 17 November 2017. About This Manual. This is version 11. XPlane XPlane 11 and XPlane 11. Flagstaff Camping Trailers MAC Series. MAKING YOUR INVESTMENT GO A LONG WAY. Flagstaff takes pride in packing the most value possible into our MAC series. It is constructed of two telescoping rods attached to a base, which extend out to about 1 meter length approximately one quarter wavelength at 5. MHz, and can be collapsed when not in use. For best reception the rods should be adjusted to be a little less than 14 wavelength at the frequency of the television channel being received. However the dipole has a wide bandwidth, so often adequate reception is achieved without adjusting the length. The half wave dipole has a low gain of about 2. Bi this means it is not as directional and sensitive to distant stations as a large rooftop antenna, but its wide angle reception pattern may allow it to receive several stations located in different directions without requiring readjustment when the channel is changed. Dipole antennas are bi directional, that is, they have two main lobes in opposite directions, 1. Instead of being fixed in position like other antennas, the elements are mounted on ball and socket joints and can be adjusted to various angles in a V shape, allowing them to be moved out of the way in crowded quarters. Another reason for the V shape is that when receiving channels at the top of the band with the rods fully extended, the antenna elements will typically resonate at their 3rd harmonic. In this mode the direction of maximum gain the main lobe is no longer perpendicular to the rods, but the radiation pattern will have lobes at an angle to the rods, making it advantageous to be able to adjust them to various angles. Whip antennaeditSome portable televisions use a whip antenna. This consists of a single telescoping rod about a meter long attached to the television, which can be retracted when not in use. It functions as a quarter wavemonopole antenna. The other side of the feedline is connected to the ground plane on the TVs circuit board, which acts as ground. The whip antenna generally has an omnidirectional reception pattern, with maximum sensitivity in directions perpendicular to the antenna axis, and gain similar to the half wave dipole. Loop antennaeditThe UHF channels are often received by a single turn loop antenna. Since a rabbit ears antenna only covers the VHF bands, it is often combined with a UHF loop mounted on the same base to cover all the TV channels. Flat antennaeditSoon after television broadcasting switched from analog to digital broadcasting, indoor antennas have evolved beyond the traditional rabbit ears. RCA is one manufacturer which has commercially sold a flat antenna. Flat antennas are very lightweight, very thin, and square shaped like a thin notebook. They connect to televisions, or to digital converter boxes, with a single coaxial cable, and may be sold with an optional signal amplifier. The amplifier must be plugged into a power source, but the flat antenna does not require a power source. The flat antenna may need some moving around to achieve an optimum reception, but it eliminates a lot of manual manipulation which is inherent in use of the rabbit ears. OutdooreditAn outdoor TV antenna is a high gaindirectional antenna often needed to achieve adequate reception in fringe reception areas, greater than 1. Outdoor antennas have a unidirectional radiation pattern so the correct end of the antenna must be pointed at the TV station.