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#11
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Constant impedance response to infinity with point radiation
On Apr 10, 3:58 am, (Richard Harrison)
wrote: Would Art cut and run if his claim of an antenna for HF that deployed in the size of two shoe boxes and that performed as well as an antenna that deployed to a significant fraction of a wavelength were so? I think not. It has always been a fairy tale. Aaah but then sometimes fairy tales come true. If you think art has cut and run because his claims are false I suggest you think again, more likely he has "finally"come to the realization he is wasting his time with people whose eyes are blinkered by the ghosts of the past and reject anything that is not written in a book. The time for disclosure is coming closer and I forecast that when it comes the so called guru's on this group will choke on their word's. Derek |
#12
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Constant impedance response to infinity with point radiation
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#13
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Constant impedance response to infinity with point radiation
On Apr 11, 9:11 am, wrote:
Aaah but then sometimes fairy tales come true. A Cinderella story this is not... Cinderella (French: Cendrillon) is a popular fairy tale embodying a classic folk tale myth-element of unjust oppression/triumphant reward. Thousands of variants are known throughout the world. The word "cinderella" means one who unexpectedly achieves recognition or success after a period of obscurity and neglect. If you think art has cut and run because his claims are false I suggest you think again, more likely he has "finally"come to the realization he is wasting his time with people whose eyes are blinkered by the ghosts of the past and reject anything that is not written in a book. The time for disclosure is coming closer and I forecast that when it comes the so called guru's on this group will choke on their word's. Derek Where is the beef? He sent the antenna to be tested by a ham on this group. Have the tests been completed? No mention yet.. Either he hasn't had time, the snow hasn't melted, or the tests have been completed, but the results not divulged by Art. Take your pick. BTW, I don't blame the tester if he hasn't had time to mess with it.. It's not really his job to do Art's work anyway.. Prior Art has only himself for this dilemma of credibility. A normal person would build the thing and compare it to a known reference. Repeatably, over a period of time over various paths, etc. They would not expect other people to do their work for them. If he can mount his miracle device on a tower, it seems to me he should be capable of also installing a 1/2 wave dipole at the appx same mounting height to act as a reference antenna. I assume his device is horizontally polarized. If not, he can use a reference monopole. He talks of receiving DX with this device. I would hope so.. It's fairly common knowledge that even a very small antenna can be a good receive antenna on that low freq. You have such a high overall level that atmospheric noise is going to be the limiting factor, rather than efficiency of the antenna. The S/N ratio will not be much less than a full size antenna under normal semi noisy conditions. Maybe not any less, unless the noise level is very low. My 44x44 inch diamond MW loop is very good at receiving, and it can provide fairly good signal levels. But I'd never be foolish enough to suggest it would make for an efficient transmitting antenna. But judging by the description he provides of his shoe box size antenna using 22 gauge wire, it's quite possible that my MW loop would out transmit his antenna on 160m. After all, it's bigger, and using a whole lot less turns to tune the antenna. When Art was listening to his DX, why did he not contact the station and request a signal report? Cat got his tongue? 0r maybe he did, and the failure to communicate was just too great for him to bear, much less divulge to the world. Only the shadow knows for sure. Why did Art not have a full size antenna up to have on the air comparisons with said DX station? Or any station for that matter.. Does he fear rejection of his antenna by said DX station? It shouldn't really be an issue, being transmitting is not required to compare the two. But you have to at least take the initiative to put up a reference antenna. Whining to rraa is not going to get it done. Woe is Art. How was the performance of the miracle antenna when you tried it? How did it compare to a full size reference antenna? Did you see the same inefficient type of performance from your version as Art described? How many people have actually been able to hear you through the noise using such an antenna? Do you cheat and let the feed line the bulk of the radiating? Do you actually work 160m at all? Oh, you say you haven't tried it at all, but just like to further the propagation of fairy tales... I get it now. In other words, you about as full of @#$% as he is? I've been choking on his bafflegab for quite a while, so that would be addfing nothing new to add to the program. :/ The only thing you have left is to prove us naysayers wrong. Better get busy. The tooth fairy is not going to do your work for you and stick it under your pillow while you count the sheep. I've already tried small antennas. Except for my mobile where I have no choice, I have no use for small antennas. I don't like having to repeat most everything I say two or three times to get a message through the noise. I tried a half size dipole on 160m, using heavy high Q loading coils. It would have eaten Arts miracle whip for lunch. But to me, it was an inferior radiating device, and was dismantled after only a short time of testing. But Art is going to beat that 120 ft long high Q loaded antenna with a shoe box sized mass of 22 gauge wire, wound in what I consider a perverted manner... Chortle....You slay me, you really do. |
#14
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Constant impedance response to infinity with point radiation
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#15
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Constant impedance response to infinity with point radiation
Art Unwin wrote:
Regards to all as I depart where I will not be privey to your replies and can thus concentrate on other matters. Art Unwin KB9MZ....XG an east ender from the UK)( Make sure the door hits you in the ass. tom K0TAR |
#16
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Constant impedance response to infinity with point radiation
On Apr 11, 11:59 pm, Richard Clark wrote:
Your forecasting ability would be better served if you actually did something. Hi Richard I put your suggestion back to you, give me a convincing argument as to why Art's antenna would not be viable, apart from the knee jerk reaction it was designed by Art therefore it cannot be viable. Derek |
#17
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Constant impedance response to infinity with point radiation
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#18
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Constant impedance response to infinity with point radiation
Derek wrote:
"---give me a convincing argument as to why Art`s antenna should not be viable,---." It may be viable. Light bulb thansmissions have been detected over considerable distances. From clues, Art`s antenna is a full wavelength of small wire coiled to make a dipole. If equilibrium means two equal coils are used to make the dipole, each contains one half wavelength of wire. Each coil fits (almost) in a shoebox. Such a dipole doesn`t radiate as a fullwave antenna, although Art`s clue is that his antenna doesn`t radiate perpendicular to the axis. That would be true for a straight fullwave antenna remote from ground. Terman says on page 868 of his 1955 opus: "The result is a directional pattern in which the maximum of radiation occurs at an angle with respect to the wire axis which is the case shown in Fig. 23-6 is approximately 64 degrees (see Fig. 23-4a)." I`d wager Art`s antenna radiates more as a halfwave dipole radiates. I posted an excerpt earlier that said that experimenters had found a short insulating whip could be wound with almost twice the resonant length of wire to make the short whip resonant at about half the frequency for a conducting pole of the whip`s length. British hams were quoted as saying the results were good when heavy wire was used for the coil. One can imagine making a dipole with two such quarterwave pole lengths which is my guess as to what Art did, except for the heavy wire. A continuous small diameter coil is a radial mode helix, not an axial mode helix. It will radiate radially or perpendicularly like a length of wire replacing the axis of the coil. Its radiating length is only about half the length of wire wound into the coil using the experimental results. A full wavelength of wire continuously loading a half wavelength dipole would have about twice the loss resistance of a straight wire dipole. This explains the wide bandwidth Art clains for his antenna. Efficiency is radiation resistance over total resistance, (loss + radiation resistance). Radiation resistances for the straight and coiled dipoles are about the same but the higher loss of the coiled antenna makes it something of a dummy load. Low efficiency does not make such antennas not "viable". B&W has many satisfied customers for its resistance loaded folded dipole. Bandwidth can trump efficiency. Art`s antenna may find similar favor. Best regards, Richard Harrison, KB5WZI |
#19
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Constant impedance response to infinity with point radiation
On Apr 12, 12:56 pm, Richard Clark wrote:
Art has modeled them all too. I think modeling is how he gets started with these things. That freaking optimizer program that shows him how to build a skewed 6 element antenna with the performance of the usual 3 element. What a breakthrough... :/ I called that particular antenna the "cluster%$#@".... Then then he abandoned that one and decided to go with the coil antenna he's pushing now. Viable? Sure it's viable if you don't mind a puny signal. Note the Isotron.. To me, not a whole heck of a lot different than what Art proposes. Arts version may be slightly inferior though.. And some people do buy and use them.. Mostly ones with yards the size of clothes closets and have no other choice but to try small antennas of that ilk. I doubt any of those users really feel like they are setting the woods on fire. I knew a guy here locally that ran one for a while on 75m. He was able to radiate, but a vast majority of the people on frequency could not hear him. I think he retired that antenna after a while. I suspect he ran out of hair to pull out... And as mentioned, quite a few QSO's have been made using dummy load light bulbs. Usually by accident when they forgot to flip the switch to the real antenna... Is a light bulb viable as an antenna? I suppose.. But don't try to claim it is an efficient radiator. To sum.. Art suffers delusions of grandeur induced by various modeling program optimizers. This can happen to anyone. But... most people will verify if the data is true by comparing to known reference antennas. Art does not do this. He places unflinching blind trust into these programs. And they have led him astray from reality. Woe is Art. |
#20
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Constant impedance response to infinity with point radiation
wrote:
Note the Isotron.. I suspect that the Isotron performs best when the feedline is radiating like crazy. So the question is: Has anyone ever tried to maximize feedline radiation? Seems that is what the Carolina Windom has done by accident. Can it be done on purpose? -- 73, Cecil http://www.w5dxp.com |
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