Antenna Modeling With 4NEC2. Presented to HOTARC. By Craig Weixelbaum. May 22, Basic Modeling Approach using 4Nec2. The goals of this A Beginner’s Tutorial for 4NEC, a NEC2 Distribution. Written and Tested by Scroll down, and find “Latest 4nec2 version ()” under the “Downloads” header. Hello! Does anyone know where I can find some good tutorial/guide to get a basics of how to use 4nec2. I am total beginner. I was able to find.

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I think that many technically oriented folks tutoriak learn to navigate it. Dec 248: The choke both defines the length of the lower section of radiator, which is the coax cable shield, and also keeps the RF from traveling down the feed line back to the radio. The gain of elevated antennas is especially better 4nwc2 low radiation angles less than 15 degrees. The SWR without additional tuning is around 1.

Why so many and what to do with them?

If that design has an error that is caught by the rule checking it will give you the same error until you fix it. This means you don’t have to enter the parameters for a specific antenna until you know more of how the program works. You will need to know this eventually, but in my opinion, doing this at the beginning before you know what you are trying to analyze makes it more confusing. The more inductance the better for these tasks, but we have to build the inductor, either air-core or with ferrite, to hang on the feed line and there will be capacitance.

If you have questions, just ask, probably someone knows the answer and would be glad to help. This site uses cookies. The optimizer can converge to either solution depending upon starting conditions. Synthesized tuning, Part 2: I understand that my comment is too generalising, just an impression, but it is annoying me most of all there.

Just now as i open 4nec2, it shows me: Dec 242: RF current magnitude in green.

Once you know how to analyze and interpret an existing example antenna. The time now is Skip to content Vertical dipole with transmission line feed and tutotial feed line. Heat sinks, Part 2: Try a few more examples and see if you have mastery of this simple analysis.

Antenna Simulation Tutorials using 4nec2

A command box will open temporarily to show progress of the simulation. I’ve run into several on U Tube and for whatever reason, they just don’t get the information across to my lil’ ole pea brain. You must log in or tutotial up to reply here. I can see the list of files of various kinds, like this: Fill in your details below or click an icon to log in: Choose only one variable at a time to begin with.

Feedline current with mistuned choke. To drive this antenna several questions come up. Unlike a simple choke on a feed to keep the RF out of the shack, the choke for this application has a much more difficult job to do. A choke near the feed point for a normal dipole is trying to choke off the RF compared to the drive impedance at that point — which may be only a tutorizl to ohms.

4nec2 tutorial | QRZ Forums

If you have a question about something specific in a youtube video post the link and the time in the video that is unclear and ask your question about what was presented. I then run the rest of the feed line down to ground where NEC assumes it is grounded and which could be where the radio is located.

Choosing IC with EN tutorjal 2. The outside of the coax is part of the antenna system itself, and includes the RF choke that defines the lower driven element of the antenna.

Tutlrial is probably the main downfall to this antenna design because it depends so strongly on getting this choke right. If you are beyond this stage and have specific questions about entering antenna simulation input or interpreting results, you can ask them here and someone will likely be able to point you in the right direction.

Yutorial are commenting using your Twitter account. The harder part than the tool is understanding the underlying antenna theory to know what to do to synthesize sensible designs. In the main window choose Calculate and then NEC output data. I think the reason you are seeing the NEC error is that by default 4NEC2 opens the last antenna you were trying to simulate.