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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Register for a free QRZ account. The optimizer is a nice tool, but not magic! Someone may be able to clarify. In the new window select instead “Far field pattern” then select Generate. You are commenting using your WordPress.

I think that many technically oriented folks can learn to navigate it. n4ec2

Attempts at direct measurement of capacitance are confounded by parasitic capacitance of scope probes and by resonances with 4nex2 physical length of coil wires and connections themselves, so that the measured resonances do not reflect the desired stray capacitance of the coil but rather the length of wires. After the simulation completes you will see that there are parameters in the main window which represent the simulation.

4nec2 tutorial | QRZ Forums

If you have questions, just ask, probably someone knows the answer and would be glad to help. In it select “Use original file” then select Generate. Input port and input output port declaration in top module 2. Internet research yielded the following formula, which seems to be plenty good for what we want. Similar Threads how can i use 4nec2 source code in matlab 0. Losses in inductor of a boost converter 9. The time now is Hopefully this information is useful.


I spent an afternoon with a few ferrite cores, some coax cable, signal generator and oscilloscope and can report that even good ferrite is not very suitable for this application. Tutoril and Inventory Search. Notify me of new comments via email.

To drive this antenna several questions come up. Change where the source is placed. How can the power consumption for computing be reduced for energy harvesting?

This is probably the main downfall to this antenna design because it depends so strongly tutoria, getting this choke right.

Just now as i open 4nec2, it shows me: Vertical dipole tip at 55 feet, green; 75 feet, pink; and 95 feet, brown. Besides the antenna I also modeled the feed transmission line to the transmitter.

Published by Gary Rondeau. Leave a Reply Cancel reply Enter your comment here There is also more than one way to specify the antenna geometry, so that makes things a bit confusing for beginners as well.

The numbers I came up with were 24 ft.

Reflections from the ends of the cable will tend to cancel each other out with this special length cable. Thanks ahead of time tuutorial your input. For example i got fully lost in the organisation of this soft.

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. For the resonant feed line antenna, the choke is located at the end of the radiating element where the local impedance is very high — voltage maximum and current approaching zero.


I am pretty familiar with 4NEC2. I can see the list of files of various kinds, like this: The lurker i am. Here is a simple explanation of the types of 4nsc2. Then incrementally build on your knowledge base of antenna data entry. A choke near the feed point for a normal dipole is 4ec2 to choke off the RF compared to the drive impedance at that point — which may be only a 50 to ohms. 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.

UA3TWMar 8, 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. Choosing IC with EN signal 2. How reliable is it? An output file contains the results of a simulation of the input file. Note that the capacitance is almost entirely just a function of the coil diameter.

You can store these wherever you want as well.

4nec2 tutorial

You are commenting using your Twitter account. Fill in your details below or click an icon to log in: Ttorial to content Vertical dipole with transmission line feed and choked feed line. The optimizer or sweeper can be used to change the value of defined variables and generate a collection of output files.

Much better is just a simple solenoid made from the coax feed line itself.

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