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Myths and Legends of Antennae
gareth wrote:
Setting aside the mistaken belief that even licensees of several years' standing have that a short antenna will radiate all the power that is fed to it, even long antennae do not do that! Ignoring the nonsense about licensees and looking at what physicists have to say about antennas, we find that all antennas radiate all the power applied to them minus any resistive loss. Consider the terminated and very-directional Rhombic with legs that are several wavelengths long; the reason for the termination is to absorb the power that does not get radiated and to prevent it being reflected and so making the Rhombic bi-directional instead of uni-directional.. Also, consider the following, if shorter (than the Rhombic) antennae radiate all the power fed to them, there would be no advantage to extending the length of any antenna because the shorter bit would have radiated all the power, and there'd be nothing left for the longer bit to radiate. A ridiculous conclusiong that totally ignores both antenna pattern and the practical issues involved in feeding very short antennas. As it is short (and unterminated) antennae only radiate a small proportion of the power that is fed to them, and that which is not radiated is refelcted back to the feed point considerably out-of-phase with the incident power and so presenting a very reactive impedance. (Yes, OK, on the way back from the reflection, a bit more might get radiated, but I suspect that the out-of-phase wave affects the EM fields thereby reducing the radiative capability) All a giant pile of babbling, confused nonsense that shows a total lack of understanding of how antennas work. -- Jim Pennino |
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Myths and Legends of Antennae
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Myths and Legends of Antennae
"Brian Reay" wrote in message
... As usual, Evans is posting malicious nonsense. Once again, you post gratuitous abuse but without venturing a technical contribution yourself He lacks even a grasp of the most basic antenna theory. Once again, you post gratuitous abuse One of his standard ploys is to utter a load of such techno-nonsense. Another is to hurl abuse. He has less pleasant ploys which, hopefully, you will be spared. Once again, you post gratuitous abuse So, M3OSN, are you having a hard time this weekend which has resulted in you lashing out in all directions in every NG that you frequent? |
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Myths and Legends of Antennae
"Brian Reay" wrote in message
... He has less pleasant ploys which, hopefully, you will be spared. Are you, perhaps, referring to the precedent that you set in 2005 to threaten the liberties and livelihoods of those who did no more than to openly disagree with you on Usenet by sending for them to be arrested by the ploddery? Did it not occur to you that your victims could end up getting the sack from their jobs when you did that? |
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Myths and Legends of Antennae
On 10/26/2014 5:01 PM, gareth wrote:
"Brian Reay" wrote in message ... He has less pleasant ploys which, hopefully, you will be spared. Are you, perhaps, referring to the precedent that you set in 2005 to threaten the liberties and livelihoods of those who did no more than to openly disagree with you on Usenet by sending for them to be arrested by the ploddery? Did it not occur to you that your victims could end up getting the sack from their jobs when you did that? You mean like you purposefully tried to get him sacked for things he did not do - and got docked for it? -- ================== Remove the "x" from my email address Jerry, AI0K ================== |
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