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#1
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Part two I finished up talking about eddy currents that form a
magnetic field in opposition to the primrary magnetic field. It is this eddy current that is considered a loss in the building of transformers and forms as a circulating current which can penetrate quite deeply in a transformer. To cut down this loss a transformer is made of laminated steel parts bound together so the depth of the eddy current is confined to a single laminate to control its penetration or skin depth. Eddy currents formed on an antenna are also circulartory such that the current flow is at right angles to the applied current flow. So the conception of skin depth of a radiator as being some sort of high resistance or corrosion skin is not quite correct. What we actually have is a force or current running into the side of another current flow so that the summation of such is deflected sideways and upwards in three dimensional terms. As I mentioned earlier this eddy field or magnetic field comes into contact with the magnetic field of the particle and where the particle is ejected together with a spin applied to it so it can maintain a straight trajectory. Remember, the particle is extremely small so it takes only a small amount of energy to send it on its way. For those who are aware of the magnetic elevation experiments the elevation force is a fraction more than the gravity force in the opposite direction and as many know to keep an article stable while elevated it is difficult to preventing the elevated article from turning over which is particle spin. So when the particle is ejected from the antenna surface it has spin so that it can maintain a straight line trajectory as well as the ability to negotiate thru areas affected by gravitational pull which is nullified by the upthrust of the elevation force created by the magnetic field of the eddy currents. However these ejected particles passing from one antenna to another does not explain the transmission of intelligence so something else has to occur otherwise we are stymied. Well remember that Newtons laws of action and reaction means there is a reactionary force on the radiator from the ejection of the particles is similar to what you see at the swimming pool with a spring board. A diver jumps on the spring board which is a downward force and the reactionary force is that applied by the spring board to the diver so in the case of an antenna it must move in a reaction to the downwards motion and you then see a repartition of what you saw with the spring board where after the diver has left it continues to oscillate for a short time. But in the case of antenna another particle quickly takes the place of the ejected particle for a place to rest such that the antenna oscillation continually takes place over a short length of time. To fully understand this repartition of ejection and replacement with respect to the natural frequency and time factors we must now investigate further the electrical circuit that simulates such action .This is called a Tank circuit where the energy supplied sloshes back and forth between a capacitor and a inductor and where the capacitor itself cannot radiate and the inductor can cause radiation in two different ways ie. when the field is being generated and when it is dissapating for each full cycle or period of the tank circuit operation. This represents the full sinosoidal of the applied alternating current when applied not to a fractional WL antenna but a full WL antenna because a period represents the repetitive function of BOTH phases of the applied current. More on the Tank circuit operation in the next Part four. If you can get ahead of the game and study the operation of a tanks circuit you will see it is not as simple as it appears because it involves time constants, voltage multiplication as well as phase change each of which is important in terms of sequence to provide for the ejection of particles . I may have to Google to get the sequence correct ie copy the description or refer to a URL for simplicity Art Unwin unwinantennas.com/ |
#2
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![]() "Art Unwin" wrote in message ... [text deleted] Art Unwin unwinantennas.com/ I went to your website but I didn't see any specific antenna information, like a ham might want to build a new type of antenna, to try it out. I saw a write-up of an H-F antenna with elements wound into a spiral and wondered if that might be yours, as you speak of physically small antennas (fraction of an expected resonant size). Pls advise in group. TNX. |
#3
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On Jul 9, 12:55 am, "Clark Kent" wrote:
"Art Unwin" wrote in message ... [text deleted] Art Unwin unwinantennas.com/ I went to your website but I didn't see any specific antenna information, like a ham might want to build a new type of antenna, to try it out. I saw a write-up of an H-F antenna with elements wound into a spiral and wondered if that might be yours, as you speak of physically small antennas (fraction of an expected resonant size). Pls advise in group. TNX. A helix is an excellent example to talk about to arrive at small full wave antennas. When you follow the reasoning of the extension to Gaussian law of statics which makes it dynamic it brings to the surface that a radiator can be any size or shape as long as it is in equilibrium. So to meet the intent of both laws which are now the same, we must not impose any lumped circuits while making our antenna. Now a helix is a fractional wave antenna with added capacitive and inductive lumped loads, thus to follow the intent of Maxwell's law we must first extend the antenna to a full wave form while at the same time cancelling the added lumped loads. So if we start with a half wave helix in standard form we have to continue the element in a down ward direction where we then reach the starting point. Doing this first completes the circuit to a full wave and secondly it cancels the pre imposed capacitive and inductive lumped load that are inherrent with a standard helix antenna PLUS we have removed the need for a ground plane as the completed antenna is now a full instead of fractional circuit. Now instead of winding with a helix angle of some ten degrees plus we can now push the windings close together and then tip the new antenna to a 10 degree plus angle to put the whole thing in equilibrium by replacing the angular force represented by the form pitch that we removed by losing the pitch of the winding. Actually this works out quite well as you can now laquer the assembly where it has no voids and is quite strong. By the way my antennas are always of a full wavelength which by virtue of its reduced volume then becomes a small FULL wave antennas to retain the inherrent efficiencies of full wave antennas in equilibrium as well as resonant. Allow me to continu on this line of thinking. It should now be seen that an array is also shrunken not only by the shortened elements but also by the fact that element spacings conform to the equilibrium of the array as a whole! We then have an array that does not have to have elements at certain distance from each other ad infirnitum but just two elements much closer together where all radiation is accounted for! Hope the above helps you out but I do expect howls of resistance from others as they wish to protect the notion that "all is known about antennas" thus this posting is sacrelidge and must be negated at all costs. And some others ofcourse will vehemently reject the notion of the WEAK force being revealed by a ham where Einstein could no so for me the end of the World is aproaching or at the least the magnetic pole of our Earth has started a full rotation! Cheers and beers Art Unwin KB9MZ....xg unwinantennas.com/ |
#4
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Art wrote:
"---thus to follow the intent of Maxwell`s law we must first extend the antenna to a full wave form." False. All we need is resonance to eliminate reactance which otherwise would limit current in the antenna . First resonance in the thin straight 1/2-wave dipole ia about 5% less than a physical 1/2 wavelength. A full wavelength straight antenna has characteristics completely different from its first-resonance cousin. A small diameter coil radiates perpendicularly to its axis. As a radiator its effect is related to the coil`s length not the length of wire on the form. Wire length is related to resistance to r-f current and therefore to loss in an antenna containing coils. That is the source of skepticism of the Unwin antenna. Resistance-loaded antennas have proven useful in situations demanding great frequency bandwidth so Art may have something of value after all. My ARRL Antenna Book (20th ed.) says on page 16-13: "The general approach has been to use a coil nade from very heavy wire (#14 or larger), with length-to-diameter ratios as high as 21. British experimenters have reported good results with 8-foot overall lengths on the 1.8 and 3.5 MHz bands." Bill Orr wrote on page 78 of "All About Vertical Antennas": "In general, a half-wavelength of no,14 Formvar-coated wire is spirally wrapped on the form, with turn spacing approximately eqial to the wire diameter. This amount of wire will approximate a quarter-wave resonance. Orr`s book was first printed in 1986. Unwin has a problem with novelty. Best regards, Richard harrison, KB5WZI |
#5
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![]() "Art Unwin" wrote in message ... On Jul 9, 12:55 am, "Clark Kent" wrote: "Art Unwin" wrote in message ... [text deleted] Art Unwin unwinantennas.com/ I went to your website but I didn't see any specific antenna information, like a ham might want to build a new type of antenna, to try it out. [text deleted A helix is an excellent example to talk about to arrive at small full wave antennas. When you follow the reasoning of the extension to Gaussian law of statics which makes it dynamic it brings to the surface that a radiator can be any size or shape as long as it is in equilibrium. [ text deleted] By the way my antennas are always of a full wavelength which by virtue of its reduced volume then becomes a small FULL wave antennas to retain the inherrent efficiencies of full wave antennas in equilibrium as well as resonant. Allow me to continu on this line of thinking. It should now be seen that an array is also shrunken not only by the shortened elements but also by the fact that element spacings conform to the equilibrium of the array as a whole! We then have an array that does not have to have elements at certain distance from each other ad infirnitum but just two elements much closer together where all radiation is accounted for! Hope the above helps you out. [text deleted] Cheers and beers Art Unwin KB9MZ Well, I'm good with the cheers and beers, but no way am I close to clipping and snipping (wire) to make an Unwin Antenna. What do they look like? Photos? Diagrams? Crayola drawings? Don't get me wrong, OM, theory is important but there's no textbook that loads up at 7220 KHz. Show me some metal parts. |
#6
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On Jul 9, 8:10 pm, "Clark Kent" wrote:
"Art Unwin" wrote in message ... On Jul 9, 12:55 am, "Clark Kent" wrote: "Art Unwin" wrote in message ... [text deleted] Art Unwin unwinantennas.com/ I went to your website but I didn't see any specific antenna information, like a ham might want to build a new type of antenna, to try it out. [text deleted A helix is an excellent example to talk about to arrive at small full wave antennas. When you follow the reasoning of the extension to Gaussian law of statics which makes it dynamic it brings to the surface that a radiator can be any size or shape as long as it is in equilibrium. [ text deleted] By the way my antennas are always of a full wavelength which by virtue of its reduced volume then becomes a small FULL wave antennas to retain the inherrent efficiencies of full wave antennas in equilibrium as well as resonant. Allow me to continu on this line of thinking. It should now be seen that an array is also shrunken not only by the shortened elements but also by the fact that element spacings conform to the equilibrium of the array as a whole! We then have an array that does not have to have elements at certain distance from each other ad infirnitum but just two elements much closer together where all radiation is accounted for! Hope the above helps you out. [text deleted] Cheers and beers Art Unwin KB9MZ Well, I'm good with the cheers and beers, but no way am I close to clipping and snipping (wire) to make an Unwin Antenna. What do they look like? Photos? Diagrams? Crayola drawings? Don't get me wrong, OM, theory is important but there's no textbook that loads up at 7220 KHz. Show me some metal parts. I am sharing information with all so there is nothing to stop you making one for your own use. I really want the Britts to use it on their small gardens at the back and get on the top bands. They are still into experimenting oiver there where America still is in the throw away society preferring the Lazy Boy and a six pack instead of a hobby. All they want to be is LOUD and talk over the other cb ers which is why their interest in antennas evolve solely around gain and a amplifier. Read some of the postings and eventually you will find where it tells you how to make one as I am not giving them away for trial runs on the air. Just follow what is evident, a radiator can be any shape size or elevation as long as it is in equilibrium. Put another way if during construction you add lumped loads in any form then they must be cancelled. Now let your imagination run wild. I have made one in sheet form so there are plenty of options |
#7
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On Jul 9, 8:10 pm, "Clark Kent" wrote:
"Art Unwin" wrote in message ... On Jul 9, 12:55 am, "Clark Kent" wrote: "Art Unwin" wrote in message ... [text deleted] Art Unwin unwinantennas.com/ I went to your website but I didn't see any specific antenna information, like a ham might want to build a new type of antenna, to try it out. [text deleted A helix is an excellent example to talk about to arrive at small full wave antennas. When you follow the reasoning of the extension to Gaussian law of statics which makes it dynamic it brings to the surface that a radiator can be any size or shape as long as it is in equilibrium. [ text deleted] By the way my antennas are always of a full wavelength which by virtue of its reduced volume then becomes a small FULL wave antennas to retain the inherrent efficiencies of full wave antennas in equilibrium as well as resonant. Allow me to continu on this line of thinking. It should now be seen that an array is also shrunken not only by the shortened elements but also by the fact that element spacings conform to the equilibrium of the array as a whole! We then have an array that does not have to have elements at certain distance from each other ad infirnitum but just two elements much closer together where all radiation is accounted for! Hope the above helps you out. [text deleted] Cheers and beers Art Unwin KB9MZ Well, I'm good with the cheers and beers, but no way am I close to clipping and snipping (wire) to make an Unwin Antenna. What do they look like? Photos? Diagrams? Crayola drawings? Don't get me wrong, OM, theory is important but there's no textbook that loads up at 7220 KHz. Show me some metal parts. Tell you what, get some wire twice the WL of the frequency you are interested in. Wind a close coil any diameter with it until half the wire is used then change direction and come back without changing wire winding direction and wind the wire on top of the first coil where you finish with two wires to feed. Put a variometer in series with it and then get on the air. Now this is not exactly in equilibrium because one coil is a larger diameter than the other. Nor is the wire pre twisted pair which nullifies near field noise to my thinking. Now you have a helix style antenna but without the helix. Coat the antenna with an alkyd type solution before you slide it off the tube since the inside coil must be exposed the same way the outside coil is exposed 'So it is easy to build a common standard form as stated on my page. I really do not know what the beef is. Alternatively make a zig zag with your wire two times and connect the wires at the top so you have two laminations,. Be inventive and don't throw your other antenna away. Hams in the past have tested their new antennas only to get insulted over the manner of testing so a ham should never make claims regarding gain |
#8
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A helix wound antenna with a double winding? Really?
- 'Doc |
#9
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![]() wrote in message ... A helix wound antenna with a double winding? Really? - 'Doc Double winding - in which direction and spaced how far apart in each direction? |
#10
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W3CQH wrote:
wrote in message ... A helix wound antenna with a double winding? Really? - 'Doc Double winding - in which direction and spaced how far apart in each direction? This URL, of a patent of an antenna which is growing in commercial use, describes just such a winding and how it is constructed for real world use. I am almost positive this is the "double helix winding method" which Art is making reference to: http://www.patentstorm.us/patents/7187335/fulltext.html In particular, this reference in the patent: "It has been found that interlacing a false winding into a current enhancing unit (such as the top unit winding shown in FIG. 6) or a radiation resistance unit (such as a helix as shown in FIG. 7) enhances the bandwidth of the top unit as well as improves the current profile along the antenna. The interlaced false winding has little effect on the resonant frequency of the antenna system." Regards, JS |
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