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#1
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![]() "Richard Clark" wrote in message ... On Sun, 13 Jul 2008 15:57:23 GMT, "Frank" wrote: For 100 W input the total radiated power is 2 mW. -47dB It will take a whole lot more signal degradation to reach the Weak Force threshold (about 83dB more, just to compare to the Strong Force - much less a standard dipole). Hi Frank, With the disclaimer: On Sat, 12 Jul 2008 10:38:06 -0700 (PDT), Art Unwin wrote: My program is not Nec based so I am not familiar with that routine., Your results will no doubt be shunned as unauthentic (in spite of his program being NEC based, but 20+ years older - we won't go into his confusion of not knowing what NEC is). I've noticed an old hobby horse trotted out to the starting gate: On Sat, 12 Jul 2008 12:21:17 -0700 (PDT), Art Unwin wrote: based on radiation per unit length of radiator This nostrum was offered years ago to explain "efficiency," and no doubt the corruption of what "efficiency" means will be used to muddy the stupendous loss into figures of amazing merit. It should come as no surprise that even allowing (patronizing the authur as several contributors here desire) for this aberrant reading of "efficiency" (per unit length) that the authur's Weak Force Antenna design is not one ten-thousandth the size of the standard dipole. As such, this new design is still not as "efficient per unit length" as a standard dipole when the authur's terms are accepted. 73's Richard Clark, KB7QHC Not sure what to say. I have designed some ultra compact vehicular helices for 0.54 to 210 MHz. Network analyzer measurements indicated the models as very close to that predicted by NEC2. The project was abandoned due to very poor results -- even with a 30 dB pre-amp the reception was unsatisfactory. The auto manufacturers are desperate to have a vehicular BC/FM/Digital antenna that fits into a "Sharkfin" shaped radome. Heck, I may have to build one of Art's models and measure the parameters. 73, Frank |
#2
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On Jul 13, 10:04 pm, "Frank" wrote:
"Richard Clark" wrote in message ... On Sun, 13 Jul 2008 15:57:23 GMT, "Frank" wrote: For 100 W input the total radiated power is 2 mW. -47dB It will take a whole lot more signal degradation to reach the Weak Force threshold (about 83dB more, just to compare to the Strong Force - much less a standard dipole). Hi Frank, With the disclaimer: On Sat, 12 Jul 2008 10:38:06 -0700 (PDT), Art Unwin wrote: My program is not Nec based so I am not familiar with that routine., Your results will no doubt be shunned as unauthentic (in spite of his program being NEC based, but 20+ years older - we won't go into his confusion of not knowing what NEC is). I've noticed an old hobby horse trotted out to the starting gate: On Sat, 12 Jul 2008 12:21:17 -0700 (PDT), Art Unwin wrote: based on radiation per unit length of radiator This nostrum was offered years ago to explain "efficiency," and no doubt the corruption of what "efficiency" means will be used to muddy the stupendous loss into figures of amazing merit. It should come as no surprise that even allowing (patronizing the authur as several contributors here desire) for this aberrant reading of "efficiency" (per unit length) that the authur's Weak Force Antenna design is not one ten-thousandth the size of the standard dipole. As such, this new design is still not as "efficient per unit length" as a standard dipole when the authur's terms are accepted. 73's Richard Clark, KB7QHC Not sure what to say. I have designed some ultra compact vehicular helices for 0.54 to 210 MHz. Network analyzer measurements indicated the models as very close to that predicted by NEC2. The project was abandoned due to very poor results -- even with a 30 dB pre-amp the reception was unsatisfactory. The auto manufacturers are desperate to have a vehicular BC/FM/Digital antenna that fits into a "Sharkfin" shaped radome. Heck, I may have to build one of Art's models and measure the parameters. 73, Frank Obviously Frank I do not have your experience and for many years total opinioni. I feel comfortable about most things is that it will never work or it is a dummy load e.t.c. I have never tested it for gain or anything like that as those sort of things arouse the ire of hams more than anything. One thing I am absoluetly positive is that I have made many antennas of this design over the years and the measurementsmade on the SWR meter in Aussi land is pretty much the same impedance that I get with my MFJ 259 b. If I could model the antenna with interleaving then I would have some idea with respect to testing. When I place a helix over a helix of the standard design pre provided as an example I also get similar impedances to what I measure so it is the pre twisted wire and the fact that it then becomes four interwound helixes is what makes the difference. When I have finished my present work I am going to think things out all again or wait for the others who are making them to present some observations. My flat matt antenna seems like a good candidate for the shark fin arrangement and that is one of them that I am sending to California! So for this summer I will have to endure the continueing caustic comments of the group who may well finish up on the correct side since they are obviously in the majority. For me the only thing that needs to be completed is a chamber test and Illinois University has one of these so..........By the way Frank the antenna did quit well on a quick sorty thru the TV channels where I anticipated just snow but I didn't get to deep on that as I vie2wed it as novelty for if I want to mess with 2.4 Ghz Regards Art unwinantennas.com |
#3
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On Jul 13, 10:04 pm, "Frank" wrote:
"Richard Clark" wrote in message ... On Sun, 13 Jul 2008 15:57:23 GMT, "Frank" wrote: For 100 W input the total radiated power is 2 mW. -47dB It will take a whole lot more signal degradation to reach the Weak Force threshold (about 83dB more, just to compare to the Strong Force - much less a standard dipole). Hi Frank, With the disclaimer: On Sat, 12 Jul 2008 10:38:06 -0700 (PDT), Art Unwin wrote: My program is not Nec based so I am not familiar with that routine., Your results will no doubt be shunned as unauthentic (in spite of his program being NEC based, but 20+ years older - we won't go into his confusion of not knowing what NEC is). I've noticed an old hobby horse trotted out to the starting gate: On Sat, 12 Jul 2008 12:21:17 -0700 (PDT), Art Unwin wrote: based on radiation per unit length of radiator This nostrum was offered years ago to explain "efficiency," and no doubt the corruption of what "efficiency" means will be used to muddy the stupendous loss into figures of amazing merit. It should come as no surprise that even allowing (patronizing the authur as several contributors here desire) for this aberrant reading of "efficiency" (per unit length) that the authur's Weak Force Antenna design is not one ten-thousandth the size of the standard dipole. As such, this new design is still not as "efficient per unit length" as a standard dipole when the authur's terms are accepted. 73's Richard Clark, KB7QHC Not sure what to say. I have designed some ultra compact vehicular helices for 0.54 to 210 MHz. Network analyzer measurements indicated the models as very close to that predicted by NEC2. The project was abandoned due to very poor results -- even with a 30 dB pre-amp the reception was unsatisfactory. The auto manufacturers are desperate to have a vehicular BC/FM/Digital antenna that fits into a "Sharkfin" shaped radome. Heck, I may have to build one of Art's models and measure the parameters. 73, Frank You know Frank, there is always the possibility that what I have is in fact a induction heater without radiation shielding. In other words the copper actually radiates a larger portion of energy into heat if there is a ferro magnetic material with in the near field! So a heat test is required on the antenna in a field where there is no possibility of induction heating. Thinking out loud here as I have not read up on the subject of induction heating which I thought was a result of hysterysis of ferro magnetic materials where I am using a diamagnetic material. There maybe a spill over of sciences here |
#4
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On Mon, 14 Jul 2008 02:24:59 -0700 (PDT), Art Unwin
wrote: there is always the possibility that what I have is in fact a induction heater without radiation shielding. It is entirely possible that it is simply conduction heating with derek's 8 Ohms of wire resistance where yours is going on 17 Ohms of wire resistance at a minimum: On Mon, 14 Jul 2008 01:06:14 -0700 (PDT), derek wrote: As a matter of interest you say on your page you used aprox 2000 feet of wire on a 12 by 12 inch former, from my experience with my former I would say you only used aprox 1000 feet of wire. I wonder what happened to the equilibrium sense of a wavelength in all this? Out the window when convenience trumps theory, and necessity drives claims. Nice to see that confederates can report failure of the basic underlying thesis. 73's Richard Clark, KB7QHC |
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