Reflector mesh surface
"Art Unwin" wrote in message ... The parabala [sic] is based on inter inductive coupling of a dipole so the parabola reflects at maximum current amplitude. Plane wave reflection from a parabola doesn't have a discrete current maximum, per se. You are not describing an antenna element whose current is maximum at the feed point, etc, etc. The helix reflector is not based on coupling but the true mechanical impact of particles which is vastly different. Maybe true, maybe not. Irrelevant either way. No 160m helix antennas. ... it is always best to initial perform the calculation from first principles to ensure that the formula is applicable where you intend to use it. I did that, it was, and I'm grateful to have your support. "Sal" |
Reflector mesh surface
On Dec 30, 9:41*pm, "Sal M. Onella"
wrote: "Art Unwin" wrote in message ... The parabala [sic] is based on inter inductive coupling of a dipole so the parabola reflects at maximum current amplitude. Plane wave reflection from a parabola doesn't have a discrete current maximum, per se. *You are not describing an antenna element whose current is maximum at the feed point, etc, etc. That was not my intention. I am pointing to the use of a parabola reflector as used with a planar design such as a dipole placed at the focal point to provide the required phase change for reflection. ala best possible coupling to achiev e desired effect The helix reflector is not based on coupling but the true mechanical impact of particles which is vastly different. Maybe true, maybe not. *Irrelevant either way. *No 160m helix antennas. If you review the works of Kraus and written thesis on different types of helix design including the addition of multiple studs you will note that all reflector surface are linear and where the sheath style reflector provided maximum gain. Because of the condensed volume of designs based upon equilibrium top band frequencies as well as broadcast and below frequences are available in a rotatable manner for directivity. By the way my antenna is based on equilibrium ( how many times have I stated that on this newsgroup?) which ruled out the standard helical design as it is NOT in equilibrium ... it is always best to initial perform the calculation from first principles *to ensure that the formula is applicable where you intend to use it. I did that, it was, and I'm grateful to have your support. Sal I don't think you did that The parabolic reflector is a design to be used in concert with planar designs only. I used a parabolic initially for temporary experimental purposes only as I did not find any data of it's use. As cup style reflectors have proven gain figures for NON planar axial radiation radiators that would seem the obvious way to go at the moment "Sal" Interesting thoughts tho Regards Art |
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