Fred,
Maybe you save your money and time and stick with you mag loop.
On Monday, March 20, 2023, 3:49 PM, Fred Moore <n40cla@...> wrote:
Good afternoon Everett
So what you are suggesting is just substituting the copper pipe with PEX.? That brings you back to a single loop with multi turns in the pipe.? What I am suggesting is to basically wind the antenna like a slinky. Maybe wind the wire on a tube say the diameter of a home depot bucket for the length of the bucket and kinda make it look like a slinky by spreading the turns evenly spaced say on a 6 foot horizontal and the diameter of the turns will be the same and support it vertically in the middle of a 6 foot horizontal pipe.
My question is this.
Has anyone done any antenna studies on the flat loops wound on an "X" frame, large diameter to small diameter?? There are NO directors or reflectors to give it directivity and the same would?hold true for this antenna I am describing.? Would one have more gain than the other say with the same amount of wire on the 2 different designs and how 'bout the nulls.? These are the questions I have.
There really is only one element on each of the antennas, so what are the charactics of each of these antennas?
I am thinking of installing one or the other of these on top of my mag loop because the mag loop will be on a rotator.
Fred
N4CLA
Fred,
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If you don't need the copper pipe and want to try your multi wire idea out, Lowe's and Home Depot both have PEX plastic pipe which will bend into a circle. It is polyethylene so it will not have any effect on the capacitance.
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Everett N4CY
In a message dated 3/20/2023 1:54:03 PM Central Standard Time,
n40cla@... writes:
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Good afternoon All,
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The other day there was a discussion about what I thought was like a copper pipe with a multi conductor cable on the inside where each conductor was connected in series with the next conductor to say a 5 foot cable would actually become a 25 foot single conductor cable housed inside this copper pipe.? Sounds like a good idea rather than trying to string 25 feet of copper wire inside a 5 foot pipe.
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So someone chimed in and said that would not be a good antenna for reasons of capacitance issues between wires inside the pipe and a few other reasons and then it was?suggested that winding wire on say an "X" spreader would be a better choice.
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Well I asked this and never heard back so I will ask this again.
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Yes, the "X" frame antenna suggested definitely?has good nulls.? I am not sure about the copper pipe idea and how well the nulls compare to the "X" frame antenna. So I asked how well would a wire antenna that was say wound like wire on a coil form with the same hollow area inside the winding and the diameter of the wire windings being consistently the same from one end of the coil to the other end of the coil.? Has anyone ever made one of these and calculated how it would compare to a flat disc style antenna for?gain and nulls?
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Just a curious question.
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Fred
N4CLA
Everett N4CY