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I do not know of any designs
by K1FO, can you elaborate? Art "Tom Ring" wrote in message . .. wrote: bandwidth but uses a high impedance, this done by extreme "close" coupling, in the order of a inch or so upwards to about 12 inches which I also wrote up in a patent some years ago just for kicks. You mean like like the K1FO design? Or something else? tom K0TAR |
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On Fri, 04 Mar 2005 05:41:29 GMT, "
wrote: I have just come to realise that if one drew a polygon of element phases in a array and all elements were 180 degrees to its companion element and excluding the driven element, the max gain and max front to back will occur at the SAME frequency! Until now I was of the understanding that these two max figures could not occur at the same frequency. Is there anything written about this possibility? Regards Art Art, Your description is too vague for someone who doesn't have some form of reference (maybe this is a continuation of a discussion from elsewhere?) Anyway, since a polygon is any shape with more than two sides in which all sides and angles are equal, this leaves a rather wide variety of shapes. Is this referencing vertical or horizontal elements? With the 180 degree element comparisons, I assume you are dealing with an equal number of sides on each polygon, or in case of verticals, at least an equal number of elements.. Is there any more you can tell us? -- 73 for now Buck N4PGW |
"Buck" wrote in message ... On Fri, 04 Mar 2005 05:41:29 GMT, " wrote: I have just come to realise that if one drew a polygon of element phases in a array and all elements were 180 degrees to its companion element and excluding the driven element, the max gain and max front to back will occur at the SAME frequency! Until now I was of the understanding that these two max figures could not occur at the same frequency. Is there anything written about this possibility? Regards Art Art, Your description is too vague for someone who doesn't have some form of reference (maybe this is a continuation of a discussion from elsewhere?) Anyway, since a polygon is any shape with more than two sides in which all sides and angles are equal, It does! then I have used the incorrect term. In a yagi type diagram you can calculate the current and phase of each elemrnt but what one is interested in is the summation of the whole array and you can do this in the same way as you would do a vector diagram of forces. With the yagi array you would first start with the reflector and draw to scale a line reflecting both phase angle and magnitude. You then add lines in cosecutive order for all other elements in the array. The end of this 'toe to tail' some what erratic line will finish up some distance from the starting point, but this distance, if drawn, represents the phase and magnitude of the array as a whole. As a former mechanical engineer but now nothing ,I was taught the term "polygon of forces" which is a cumulative vector array but the shape did not necessarily consist of "equal "sides as you stated.. But then I am English born and it is known that Americans completely messed up the Elizabethan era language which a true cockney still adheres to , where as others in the same country have learned to talk in such a way it sounds as if they are trying to retain a marble in their mouth.without swallowing it. Regards Art this leaves a rather wide variety of shapes. Is this referencing vertical or horizontal elements? With the 180 degree element comparisons, I assume you are dealing with an equal number of sides on each polygon, or in case of verticals, at least an equal number of elements.. Is there any more you can tell us? -- 73 for now Buck N4PGW |
On Tue, 08 Mar 2005 05:29:03 GMT, "
wrote: "Buck" wrote in message .. . On Fri, 04 Mar 2005 05:41:29 GMT, " wrote: I have just come to realise that if one drew a polygon of element phases in a array and all elements were 180 degrees to its companion element and excluding the driven element, the max gain and max front to back will occur at the SAME frequency! Until now I was of the understanding that these two max figures could not occur at the same frequency. Is there anything written about this possibility? Regards Art Art, Your description is too vague for someone who doesn't have some form of reference (maybe this is a continuation of a discussion from elsewhere?) Anyway, since a polygon is any shape with more than two sides in which all sides and angles are equal, It does! then I have used the incorrect term. In a yagi type diagram you can calculate the current and phase of each elemrnt but what one is interested in is the summation of the whole array and you can do this in the same way as you would do a vector diagram of forces. With the yagi array you would first start with the reflector and draw to scale a line reflecting both phase angle and magnitude. You then add lines in cosecutive order for all other elements in the array. The end of this 'toe to tail' some what erratic line will finish up some distance from the starting point, but this distance, if drawn, represents the phase and magnitude of the array as a whole. As a former mechanical engineer I am not ... You may be using a term familiar to your trade and I am unfamiliar with. I would be a layman in respect ... that could be the misunderstanding. I was trying to envision the antenna you were describing... can you imagine what I was seeing in my mind? :) but now nothing ,I was taught the term "polygon of forces" which is a cumulative vector array but the shape did not necessarily consist of "equal "sides as you stated.. But then I am English born and it is known that Americans completely messed up the Elizabethan era language which a true cockney still adheres to , where as others in the same country have learned to talk in such a way it sounds as if they are trying to retain a marble in their mouth.without swallowing it. Actually, I like the UK accents. As I believe my misunderstanding has nothing to do with the queen's English, but rather techno-speak for your trade, I will pack up my octagon shaped array of dipole antennas and gracefully move on to another topic. Good luck and I'll catch you in another thread. Buck Regards Art -- 73 for now Buck N4PGW |
Buck,
I agree with you. I too cannot figure out what Art is trying to say. However, your response containing the definition of a polygon is incorrect. There is no requirement for equal sides or angles. 73, Gene W4SZ Buck wrote: Art, Your description is too vague for someone who doesn't have some form of reference (maybe this is a continuation of a discussion from elsewhere?) Anyway, since a polygon is any shape with more than two sides in which all sides and angles are equal, this leaves a rather wide variety of shapes. |
On Tue, 08 Mar 2005 15:46:24 GMT, Gene Fuller
wrote: Buck, I agree with you. I too cannot figure out what Art is trying to say. However, your response containing the definition of a polygon is incorrect. There is no requirement for equal sides or angles. 73, Gene W4SZ Right. Webster says a plane polygon is a closed figure bounded by straight lines. No mention of number, length or angles, although it seems to me that you best have at least three sides, although Art might have a new polyglot method that uses only two. [g] Buck wrote: Art, Your description is too vague for someone who doesn't have some form of reference (maybe this is a continuation of a discussion from elsewhere?) Anyway, since a polygon is any shape with more than two sides in which all sides and angles are equal, this leaves a rather wide variety of shapes. |
A polygon which has equal sides and angles is a special case of polygon,
known as a "regular polygon". Roy Lewallen, W7EL Wes Stewart wrote: On Tue, 08 Mar 2005 15:46:24 GMT, Gene Fuller wrote: Buck, I agree with you. I too cannot figure out what Art is trying to say. However, your response containing the definition of a polygon is incorrect. There is no requirement for equal sides or angles. 73, Gene W4SZ Right. Webster says a plane polygon is a closed figure bounded by straight lines. No mention of number, length or angles, although it seems to me that you best have at least three sides, although Art might have a new polyglot method that uses only two. [g] Buck wrote: Art, Your description is too vague for someone who doesn't have some form of reference (maybe this is a continuation of a discussion from elsewhere?) Anyway, since a polygon is any shape with more than two sides in which all sides and angles are equal, this leaves a rather wide variety of shapes. |
On Tue, 08 Mar 2005 12:58:06 -0800, Roy Lewallen
wrote: A polygon which has equal sides and angles is a special case of polygon, known as a "regular polygon". I stand corrected.... Roy Lewallen, W7EL -- 73 for now Buck N4PGW |
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