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#1
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![]() "Rob" napisa³ w wiadomo¶ci ... Szczepan Bialek wrote: So you think the electron emission from your transmitter antenna is something not in the textbooks but still happening in reality? In reality the electrons escape from all charged bodies. Because a dipole does not need a ground, it is a symmetric antenna which is not driven relative to ground. Do you mean the antenna with the two legs where the one leg is connected to the shield of a coax? That is not a correct way to feed a dipole! There must be a balun between the coax and the dipole. The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png S* |
#2
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"Szczepan Bialek" wrote in message
... The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png S* Good morning again Szczepan. The caption to that diagram is "Coax and antenna both acting as radiators instead of only the antenna." Note carefully - coax AND antenna BOTH acting as radiators. Directly below that illustration is another one showing the usual operation of a dipole. Regards, Ian. |
#3
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Szczepan Bialek wrote:
"Rob" napisa³ w wiadomo¶ci ... Szczepan Bialek wrote: So you think the electron emission from your transmitter antenna is something not in the textbooks but still happening in reality? In reality the electrons escape from all charged bodies. So you do know that it is not related to transmitting a signal, after all? Because a dipole does not need a ground, it is a symmetric antenna which is not driven relative to ground. Do you mean the antenna with the two legs where the one leg is connected to the shield of a coax? That is not a correct way to feed a dipole! There must be a balun between the coax and the dipole. The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png S* The color someone used in an illustrative diagram has no significance in the operation of the antenna. Both the halves of the dipole are involved in the radiation. |
#4
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![]() "Rob" napisa³ w wiadomo¶ci ... Szczepan Bialek wrote: Do you mean the antenna with the two legs where the one leg is connected to the shield of a coax? That is not a correct way to feed a dipole! There must be a balun between the coax and the dipole. The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png The color someone used in an illustrative diagram has no significance in the operation of the antenna. Both the halves of the dipole are involved in the radiation. If it is feed by the two wires transmission line: http://www.deltadx.net/ABCDx/Sections/Antennas.htm http://www.deltadx.net/ABCDx/Section...le-Ladder2.gif S* |
#5
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Szczepan Bialek wrote:
"Rob" napisa³ w wiadomo¶ci ... Szczepan Bialek wrote: Do you mean the antenna with the two legs where the one leg is connected to the shield of a coax? That is not a correct way to feed a dipole! There must be a balun between the coax and the dipole. The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png The color someone used in an illustrative diagram has no significance in the operation of the antenna. Both the halves of the dipole are involved in the radiation. If it is feed by the two wires transmission line: http://www.deltadx.net/ABCDx/Sections/Antennas.htm http://www.deltadx.net/ABCDx/Section...le-Ladder2.gif S* Did you notice there is no connection to ground required? |
#6
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![]() "Rob" napisa³ w wiadomo¶ci ... Szczepan Bialek wrote: "Rob" napisa3 w wiadomo?ci ... Szczepan Bialek wrote: Do you mean the antenna with the two legs where the one leg is connected to the shield of a coax? That is not a correct way to feed a dipole! There must be a balun between the coax and the dipole. The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png The color someone used in an illustrative diagram has no significance in the operation of the antenna. Both the halves of the dipole are involved in the radiation. If it is feed by the two wires transmission line: http://www.deltadx.net/ABCDx/Sections/Antennas.htm http://www.deltadx.net/ABCDx/Section...le-Ladder2.gif S* Did you notice there is no connection to ground required? Jimp wrote: "Only end fed monopoles need radials". Marconi wrote that all antennas needs ground. It is obvious that "the antenna with the two legs where the one leg is connected to the shield of a coax" is the Marconi antenna. It is not the dipole antenna. The rest of your antennas (small power) can have the ground from AC supply or chassis. S* |
#7
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Szczepan Bialek wrote:
"Rob" napisa³ w wiadomo¶ci ... Szczepan Bialek wrote: "Rob" napisa3 w wiadomo?ci ... Szczepan Bialek wrote: Do you mean the antenna with the two legs where the one leg is connected to the shield of a coax? That is not a correct way to feed a dipole! There must be a balun between the coax and the dipole. The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png The color someone used in an illustrative diagram has no significance in the operation of the antenna. Both the halves of the dipole are involved in the radiation. If it is feed by the two wires transmission line: http://www.deltadx.net/ABCDx/Sections/Antennas.htm http://www.deltadx.net/ABCDx/Section...le-Ladder2.gif S* Did you notice there is no connection to ground required? Jimp wrote: "Only end fed monopoles need radials". Marconi wrote that all antennas needs ground. Marconi was wrong. |
#8
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Szczepan Bialek wrote:
"Rob" napisa? w wiadomo?ci ... Szczepan Bialek wrote: "Rob" napisa3 w wiadomo?ci ... Szczepan Bialek wrote: Do you mean the antenna with the two legs where the one leg is connected to the shield of a coax? That is not a correct way to feed a dipole! There must be a balun between the coax and the dipole. The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png The color someone used in an illustrative diagram has no significance in the operation of the antenna. Both the halves of the dipole are involved in the radiation. If it is feed by the two wires transmission line: http://www.deltadx.net/ABCDx/Sections/Antennas.htm http://www.deltadx.net/ABCDx/Section...le-Ladder2.gif S* Did you notice there is no connection to ground required? Jimp wrote: "Only end fed monopoles need radials". Marconi wrote that all antennas needs ground. Jimp has read modern literature and is correct while Marconi was wrong. It is obvious that "the antenna with the two legs where the one leg is connected to the shield of a coax" is the Marconi antenna. No, it is not "obvious", it is nonsense to call a dipole a Marconi antenna. A Marconi antenna by definition is an end fed monopole one quarter wavelength high. It is not the dipole antenna. A dipole most certainly IS a dipole. The rest of your antennas (small power) can have the ground from AC supply or chassis. Babbling nonsense. You are an ignorant, ineducable idiot. |
#9
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![]() "Szczepan Bialek" wrote in message ... snip Marconi wrote that all antennas needs ground. It is obvious that "the antenna with the two legs where the one leg is connected to the shield of a coax" is the Marconi antenna. It is not the dipole antenna. The rest of your antennas (small power) can have the ground from AC supply or chassis. S* Brilliant! I wish there were some way to preserve these teachings. Maybe I can take a course and learn how to write. Then, if I had a pencil, I could copy it all down, if I had some paper. Would that work? "Sal" (KD6VKW) |
#10
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Szczepan Bialek wrote:
"Rob" napisa? w wiadomo?ci ... Szczepan Bialek wrote: Do you mean the antenna with the two legs where the one leg is connected to the shield of a coax? That is not a correct way to feed a dipole! There must be a balun between the coax and the dipole. The balun only improve the monopole . The only one leg is red (radiate): http://en.wikipedia.org/wiki/File:Di...ebandbalun.png The color someone used in an illustrative diagram has no significance in the operation of the antenna. Both the halves of the dipole are involved in the radiation. If it is feed by the two wires transmission line: http://www.deltadx.net/ABCDx/Sections/Antennas.htm http://www.deltadx.net/ABCDx/Section...le-Ladder2.gif S* Not "if", moron, always. READ your own link. If a dipole is fed with coax AND if there is NO balun device, then common mode current flows on the outside of the coax and the coax ALSO radiates. If a dipole is fed with coax AND if there IS a balun device, then there is no feedline radiation. In either case, the dipole radiates from both halves. That is what your link says happens but you are too stupid to read it and can only look at the pictures and misinterpret what they mean. |
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