Helix model doesn't work

[Seegi]

Hello,

I modeled this mobile antenna https://drive.google.com/file/d/1Eu90_S2Z8wjJS1Y-F8kF0E5IRyJf6gHj/view?usp=sharing with a helix in the middle in excel and transferred to MMANA-GAL. I think the syntax is correct, but it doesn´t work. Can somebody tell me why??

Thanks an best regards,
Seegi

[Igor Gontcharenko]

Hi Seegi,

1. Not corect number og wires. Was 193, must be 189.
2. No ground or radials.

The correct file is in the attachment.

P.S. Wires 5 and 6 are not electrically connected. Is this the way it is designed? If not, go to the Wire Edit window and connect them together.

[Seegi]

Hello Igor,

first of all thanks for your quick answer and help. Unfortunately your model doesn´t represent the antenna as it should be.
But perhaps let me explain, what I wanted to do.
I bought a mobile antenna from the Brand smartEQ https://www.wimo.com/en/62006 . It is designed for a frequency range of 375-480MHz and can be tuned to a frequency by cutting the top an the end according to a tuning table. What I want to know, when I cut the the antenna for 404MHz (A=150mm, B=686mm) and use it on 202MHz as a stacked 1/4λ+1/8λ, how will it behave? Therfore, I tried to model the geometry of the antenna as accurate as possible. I made the initial design in EZNEC, because it has this helix design function, but the program itself I don´t know, so the I switched to MMANA-GAL.
Due to the fact, that it is mounted on the car roof, I started with 1.5m above ground on the Z-axxis.
So the colors show the different sections I modeled. Yellow roof mount, green the hexagon with the thread, blue the 3mm Pole, pink the helix and so on...
For the helix itself there is also the calculation of the pure electrical specification, see attachment.

[Seegi]

Here I attached the file I used from EZNEC and a photo of the antenna.

Thanks and best regards
Seegi