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Maximum transfer of energy occurs when the input Z of the cable and antenna are the same.

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Q: Why should the impedences of dipole and cable should be matched in an antenna?
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And which clauses should be matched with and who clauses?

And which clauses should be matched with and who clauses.


Will a simple Dipole antenna pickup digital TV?

From what I have researched and discovered your normal antenna that you have should suffice in picking up the digital signal. Mine at home is working fine with it. Just be careful because the stores are going to try and say you need to get a new antenna when in reality there is not a single difference in design or material or calibration of any sort. That person has not had trouble so far because it has not switched to strictly digital yet.


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The cost of repairing drywall damage would depend on how much damage is done. If you were to buy the drywall it ranges from $10 to $30 a sheet. Plus if you hired someone then it would cost more for labor then it would if you did it yourself.


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A wavelength of 11 meters puts you in the citizen's band. Most equipment uses vertical antennas, and so should you to have the best reception on both ends of a call. There are many ways to assemble a dipole, from a straight wire, to a ladder line, to a coaxial bazooka, to . . . . And many ways to connect your feedline to the radio transceiver: with or without a balun, with or without a balanced feedline, and so forth. Try Googling for dipole antennas, and see what you come up with.


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How does yagi-uda antenna differ from a folded dipole a loop antenna and a helical antenna?

Wow, your question on how a yagi-uda differs from a folded dipole, a loop antenna, and a helical antenna relates very much to how does a lawn mower engine relate to a V-8. The principals in all the antennas remains much the same. So I will deal with them in the order asked. The Yagi in its simplest form consists of 3 elements. The center element is the driven element and is essentially a dipole. Behind it is a slightly larger element called a reflector which does just that, it reflects signals to and from the dipole and in front there is the smaller director which helps focus energy. This is a directional antenna with gain. The folded dipole goes back to the basic dipole except it has makes a full loop. They are just as about as long as regular dipoles. With the loop of wire out there, they tend to have a wider band width than regular dipoles - but are not as tolerant of being used at even multiples of their cut frequency as the wires tend to cancel out each other. Oh, btw, yagi's have been made using folded dipoles. You must use ladder line or a 4:1 balun on folded dipoles, with perhaps the exception of the terminated folded dipole which has a resistor where the two elements of the dipole come together. The loop antenna? Which loop? I assume you are talking the traditional loop and not the magnetic loop. The full loop is normally computed to be 1005/frequency=feet. While you could take the time to tune the antenna, it might just be easier to put in a balun and an antenna tuner. The main advantage of a loop over the previous reviewed antennas is that it does fairly well even though fairly close to the ground where the previous 2 antennas should be at least 1/2 a wave length up for good performance. Helical antennas are generally good for just one band. In fact, due to the loading they cause they are best if used on a single frequency as their feed line requires them to be provided the connecting feed the is the electrical equivalent of a 1/2 wave at that frequency of operation. This may work well at VHF and above as an entire band can be tuned satisfactory, but in HF it would limit you to a very small segment of the band. Helical antennas definitely are the lawn mower engines of the antenna world. Look up antenna elmer on your favorite search engine. You have entered into a world where there is still a lot homework left to be done.


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