With the misshapen memory of the method that magazine of old to electron describes, the periphery that I think to the method that introduces by this uses closet door makes a kind " super casing antenna " . I do not know what the wire of this antenna is, also do not know to need to have a few rounds after all, but I think this antenna is held out certainly " cruel " , the direction that because you are OK and jolty,closet door changes this antenna turns to the place that you need.
Through increasing an alterable electric capacity, should OK make it a line of first-rate broadcast Duan Tian. Who knows exact parameter?
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In July I had the background careful mathematical consideration, the conclusion that reach is such, if you use the closet door that is a square, the 0-365 PF with the standard is adjustable capacitor, use about 80 feet (25 meters) the line just can achieve a requirement, (the area size of the casing that you choose beardless apprehension antenna)
Closet door is not square of course model, so the length of this line meets some distinguish (perhaps should grow a bit, but the mathematical computation that passes me, differ not quite big, I record specific data is not too clear) . You are OK along closet door quadrilateral burrow, insert club next, such coming that circle a line to make Loop.
Part each line carefully (every the circle maintains 1 centimeter or wider interval is optimal) with reducing the distributinging electric capacity of Loop antenna as far as possible. If you are done not have so do, these additional distributinging electric capacity can affect the frequency of wave band high end to answer.
The company markets the casing of finished product antenna now, the self-restrained method that I introduce is OK the expenditure that big political integrity restricts you, I once saw the harmonious Loop antenna of finished product sell with 100 beauty's round price, but if I am abstained,spend 5 beautiful circles at most.
BTW, the idea of Loop of this closet door is very clever, my general makes my casing antenna by this law, now most those who headache is to rotate aerial decides good place, and won't collapse come down.
The line of day make a present of of receiver (one) (2)
The line of day make a present of of receiver (one)
Aerial is the effect that rise to blast off or receives electromagnetic wave in radio communication technology, of aerial function admirable, often have the effect of get twice the result with half the effort in wireless communication. Tell from the principle, emissive antenna and receving antenna are each other is easy, but discriminating still is in applying actually. One pair launchs the antenna with good performance on rate of some Duan Pin, also be certainly the receving antenna with good performance is received on this paragraphs of frequency, but informal an antenna that can receive, also not be admirable emissive antenna certainly however. Major research and the article of discussion antenna, data slants overweight launchs a respect, actually, about aerial receive a respect to also have very large fine, this, emphasize particularly on to us for the lover that radio receives, often appear particularly important.
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Generally speaking (besides blast off and receive common antenna) , emissive antenna projects the result to highlight and emphasize, often use syntonic antenna (tape antenna) , and receving antenna often uses blame resonance antenna however (broadband antenna) , although receving antenna loop is put in resonance on certain frequency, but the quality factor that aerial loop measures syntonic level (Q is worth) lower still, such antenna basically can regard blame resonance antenna as. If use,think same aerial will finish whole wave band to receive, include V/U wave band, arrive even the reception of 1G above frequency, had better be the broadband antenna that chooses a few manufacturer to pass special design, some broadbands antenna can work inside the frequency limits in 500KHz-1500MHz, but broadband antenna (be not syntonic antenna) the result that receives weak signal always is inferior to tape antenna (syntonic antenna) . As to take an a few meters long lead or the antenna that are other to act as casually complete frequency antenna will do complete frequency to receive, affirmation won't have good effect.
Judge the actor of low quality that an antenna blasts off and receives performance, basically have index of such a few technologies.
One, aerial efficiency
Height of erect of length of frequency of appearance of qualitative, antenna, job, antenna, antenna concerns the conductor material of aerial efficiency and erect antenna.
1, aerial material is qualitative
Choose electric property as far as possible the metallic stuff with low rate of good, resistor, wait like silver-colored, copper, aluminium. Because the cost of silver-colored wire is too high, electrical engineering pure copper cash had better choose in applying actually so. Seductively dressed or made up by copper mine stone after refine, eliminate impurity, want to reduce oxide especially, cathode copper gets after repass electroanalysises, pull silk next. The foreign matter of pure copper of this kind of electrician is little, resistor rate is very low. The wire that factory of electrical wiring of a few normal state-operated produces and enamel-insulated wire belong to this kind of wire. After often still seeing a few town enterprises or SOHO use smelt of reclaiming useless old copper in the market now (second birth copper) manufacturing electrical wiring, place of material of this kind of copper cash contains impurity more, resistor rate is older also, if use this kind of wire to make when aerial, the effect of aerial won't be very good, past contact can increase the white noise when receiving, go against the reception of weak signal. When making antenna with all sorts of wire, sectional it is good that big wire receives the result at sectional small wire. As a result of the collect skin effect of high frequency signal, likewise sectional when, of material of much plied yarn it is good to receive the result at material of odd plied yarn. Aluminous material is in what when making 8 wood antenna, use commonly more.
2, the appearance of aerial
To improve the efficiency of aerial, often use the antenna of different figure in different wave band, LW paragraph with long term aerial is given priority to, MW paragraph with long term aerial and cricoid antenna are given priority to, SW paragraph with long term aerial, occasionally extremely aerial and 8 wood antenna are given priority to, FM paragraph give priority to with antenna of 8 wood antenna and whip shape with V/U wave band, the small wave band of 800M above is given priority to with board shape antenna and paraboloid antenna.
3, working frequency
The job the antenna at different frequency, its efficiency also is different, the efficiency of aerial follows the job to rise and increase of frequency commonly, the efficiency of high frequency antenna is general prep above
Low frequency antenna. The data makes clear: The efficiency of long wave antenna is 10% , 40% , the efficiency of medium wave antenna is 70% , 80% , the efficiency of shortwave antenna is 90% , 95% , ultrashort (FM, V,
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