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Are there tvs made with built-in antennas that do not need an antenna hooked up to them?
Wiki User
∙ 11y ago
There are a few small, portable televisions that have inbuilt aerials. They have been around in the analog days and new versions have digital receivers.
The thing that they all have in common is that they don't work well. The built in aerial needs a very strong signal to be effective. Some people are lucky enough to use them in good signal areas, most others have to put up with intermittent pictures or very limited channels.
If you can, try before you buy and in the areas that you will be using it if you buy it.
Wiki User
∙ 11y ago
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Can aluminum be used as an antenna?
Yes, many antennas are made from aluminum.
What are antennas made of?
Antennas can be made of various materials, with common ones being metal, such as aluminum or copper. The choice of material depends on the frequency and desired characteristics of the antenna. Additionally, antennas may also contain non-metallic components like plastic or ceramic for structural support or insulation.
How can you tell the difference between a CB antenna and a VHF antenna?
The CB antenna is made for a limited band of frequencies and the VHF is a wide band antenna made for higher freqs. A CB antenna will not make a good tv antenna. A CB ant. is mounted on the vertical and tv ants. are mounted horiz. in the USA. VHF antennas are much smaller as they are for higher frequencies. Usually, they have many elements (rods) and will go from long in the back to short in the front. Certain CB antennas (beams) are mounted horizontally, but all of the elements are roughly the same length - and about twice as long as a VHF antenna. The elements on a horizontal CB antenna are roughly 18 feet from end to end.
Why would an Eclipse antenna not go down all the way?
Some electric powered antennas were made to not totally retract. 4 to 8 inches retracted size is about normal. Some electric powered antennas were made to not totally retract, 8 to 10 inches is about normal retraction length.
What are the advantage of trap dipole antenna?
A dipole antenna, is a radio antenna that can be made of a simple wire, with a center-fed driven element. It consists of two metal conductors of rod or wire, oriented parallel and collinear with each other (in line with each other), with a small space between them. The radio frequency voltage is applied to the antenna at the center, between the two conductors. These antennas are the simplest practical antennas from a theoretical point of view. They are used alone as antennas, notably in traditional "rabbit ears" television antennas, and as the driven element in many other types of antennas, such as the Yagi. Dipole antennas were invented by German physicist Heinrich Hertz around 1886 in his pioneering experiments with radio waves.
How plasma antenna works?
A plasma antenna is a type of antenna in which the metal conducting elements of a conventional antenna are replaced by plasma. A new antenna made of plasma (a gas heated to the point that the electrons are ripped free of atoms and molecules) works just like conventional metal antennas except that it vanishes when you turn it off.
Why are satillites antennas curved?
Satellite antennas are typically curved to allow them to receive signals from a wider range of directions. This is due to the fact that the curved surface increases the gain of the antenna allowing it to better receive signals from any direction. Curved antennas also help reduce the amount of noise that is picked up resulting in a clearer signal. Additionally curved antennas often have a larger reception area than straight antennas which allows them to pick up a wider range of frequencies. There are a few different types of curved antennas that are used for satellite communications. The most common type is the parabolic antenna which is made up of a parabolic reflector and a feed horn. This type of antenna is highly directional meaning that it can focus on one particular satellite in the sky. Other types of curved antennas include Yagi antennas which can receive signals from a number of different directions and helical antennas which are used for receiving signals from a single satellite. The use of curved antennas in satellite communication systems has numerous advantages. They allow for a wider range of frequencies to be received resulting in a clearer signal. They also reduce noise resulting in a clearer signal. Lastly curved antennas are often more efficient than straight antennas meaning that they can pick up signals from further away.
What is the need for antennas what are transmitting antennas what are receiving antennas?
Antennas transfer energy from a cable into the airwaves efficiently. Any transmit antenna can also be a receive antenna and viceversa. If you wish to transmit high power from an antenna, usually heat generation or high voltage is a concern that can destroy the antenna. To prevent problems, high power antennas require thicker wires and sometimes insulators to prevent overheating/burning and arcing. Many antennas can simply be made of wire of a simple length and they'll be very efficient. The length of an antenna changes it's efficiency to the cable. If you want the antenna to be efficient, you must size it to match the cable impedance. Usually the length of a single wire exiting above a metal plate is one quarter wavelength or 1/4 x 11,803/frequency in megahertz. For FM radio on an automobile, some antennas have motors that extend out of the body of the car. The height (inches) should be 1/4 x 11,803/100 megahertz or just under 30 inches. TV antennas above a house are most often a set of half wavelength wires, so change the 1/4 to 1/2 in the formula above. They use many different wire lengths to cover all the frequencies in the television band, which extends from about 50 megahertz to around 600 megahertz. Cell phone frequencies were picked partly to make the antennas small and partly so that cell phone reception can enter buildings with rebar reinforcement. Cell phone frequencies are roughly 800 megahertz and 1800 megahertz. Receiver antennas are often made smaller than either transmit or transceiver antennas. If you open up the back of an older transistor radio, you are likely to find a bar made of ferrite material with an insulator and wire wrapped around that. The wire is wrapped a number of turns to match the impedance required by the circuit. The ferrite bar is able to focus signals to itself which in turn induces a current in the coil. While impedance is an important issue, simple dipole antennas can be sized by the 468/Frequency in mHz formula. It will give the the length of an antenna in feet. You divide the outcome by 2 to find out what each side length should be. The impedance of an antenna can ofter be adjusted by its shape. The 90 degree V shape yields a near perfect 50 ohms impedance which is commonly used for transmitters and transceivers where as the flat top diode has a higher impedance. The ARRL has good books on antennas. You might want to go to the library and look at a few of them.
Make Sure You're Set For Dtv With a New TV Antenna?
You’ve probably seen the commercials 100 times, asking you if you’re ready for the switch to DTV, but are you ready? If not, you should have been, because the government made the switch whether you were ready or not. All DTV means is that the government standard for television broadcasting switched from analog to digital. This doesn’t sound like a big deal, except some TVs and TV antennas can’t handle the conversion. So, what do you do? You’ll have to go out and find yourself a new TV antenna that can receive the digital signal. If you’ve never shopped for a TV antenna, don’t worry. It’s not too difficult to procure one. You just need to know where to look and what to look for. There are several types of antennas on the market, but you’re going to want to find one that will help you pull that DTV signal, and not the older, analog signal. Now, you can find HDTV antennas on the market, as opposed to just regular TV antennas. Obviously, these won’t do you any good if you don’t have an HDTV, but you should still be able to get great reception with one, even if you’re in standard definition. Make sure you look for an HDTV antenna when you do your shopping. The next thing you need to decide is if you want an indoor or an outdoor antenna. This is pretty much as easy as it sounds, do you want your antenna to be station indoors or outdoors? Standard TV antennas are station indoors and are attached directly to the TV. Outdoor antennas, though, can be mounted on the roof, with a cable run to the TV you’re trying to get a signal on. While the outdoor antenna may be a little harder to set up, you’re going to get a much better picture than with the standard indoor antenna. The final thing you need to consider is price. With the upgrade in technology, TV antennas have really come down in price. You can find a simple, indoor antenna for as little as $7, but even if you go for the top of the line, you won’t have to spend more than about $60 for a high- quality, outdoor HDTV antenna. So, if you’re having trouble with the DTV signal, you may need to go out and get yourself a new TV antenna. Make sure you check out the HDTV antennas and whether or not you want an indoor or outdoor antenna, and you’ll be all set.
Why are antennas white?
That's the color they are made with.
How Do Cell Phone Booster Antennas Work?
Many people find themselves frustrated with their cell phone's poor reception. Frequently, people attempt to employ cell phone booster antennas to improve their signal. There are two main types of cell phone booster antennas: small ones applied to the outside of the phone and large arrays used to improve coverage in buildings.Personal booster antennasFirst, it is important to research antenna boosters before purchasing one. There are home-consumer cell phone booster antennas that do work. Many cell phones have an external antenna port that is connected to a car kit or another external antenna adapter. Basically, this means plugging the phone into a larger antenna, either mounted on the car like a radio antenna or in the house. By giving the phone a longer antenna, these improve signal strength. Cell phones work on a line of sight system. Added antenna height adds height to the overall device, meaning that the phone is able to get better reception, especially in hilly areas. Without an external antenna port, users are forced to attempt to use one of the wireless adapters which are not as effective. Some people do report slightly improved reception with these stick-on antennas but usually only with antennas made by reputable companies. Always make sure to select an antenna from a reputable wireless company, such as Wilson, LG or Palm, instead of choosing a cheap device.It is important to research antenna boosters before purchasing one Commerical booster antennasOnce again, Wilson is noted for making high-quality booster antennas for office buildings and malls. These boosters are dishes mounted on the roof and are technically called repeater systems. This means that the dish captures the signal and then rebroadcasts it with greater strength. While not practical for home use, these devices are a fantastic choice for large office buildings, schools, hospitals and other buildings that experience difficultly with cell signal.When it comes to choosing a cell phone booster antenna, it is best to choose an additional external antenna that is mounted outside a home or car. Businesses can also install dishes that amplify and rebroadcast the cell signal. Users should always choose a device from a reputable electronics company rather than from a late night TV advertisement or a dollar store.
Do European cars have radio antennas?
yes European cars have antennas i own a 1994 golf gti that was made in Italy and it has one
