You see the "T" in the green box on each wire in the chocking coil? I assume you can see this, and for others it is the symbolic indicator that means the wire has been converted to being coaxial. Sometimes we can see the 2 wires and sometimes we can't just like you have described.
I made the feed line from the bottom of the coil to 3" above Earth offset...so we could easily see these 2 wires for the coax. You might agree that there are only 2 wires and the coax shield outer surface presents yet another 3rd surface that allows the flow of currents. I agree too, but to be clear, there are only 2 wires, and IMO Eznec does not require an additional 3rd wires to make a FL radiate.
When I look into the end of regular coax...I generally see only two wires, the center conductor and the shield. The fact that currents can flow on the outside to the shield too, is granted, This is what Common Mode Currents are all about, and in this case the CMCs are our very beneficial.
The wire for the feed line to the radio, the wires in the coil, and the wire for the bottom section of this radiator design are all coaxial. They have a "T" inside a square box. It is near the middle of each wire that is noted to have wire dimensions in the Eznec TL tool spreadsheet.
Bob, I don't think you are confused about this issue, and if you want to say there are 3 wires then so be it. I have to think about what others might be thinking when they consider this back and forth over little or nothing between us.
You've now seen, possibly for the first time ever, the coil at the base of the GM, made as wire and then also made coaxial.
Bob, below is the model with just wires for the coil before I used the TL tool. Can you agree that the possible current distribution on this coil made with simple wires, caused the current magnitude at the base of the coil to be very low to start and steadily increase in magnitude toward the top of the coil?
I plan to do the same thing with the model where all these same wires are made coaxial and then check the current magnitude distribution of the coil again, and compare both.
Below is the matching details for the coil with just wires, and no TL Tool was used yet. I noted earlier that this model was making the match inductive with +600 ohms of inductance at the feed point, and it was also making a lot of RF from the coil. You commented on those effects if you remember. Click on the PDF file below.
