Wow, At last a clear precise tutorial. Not a single " errr, um, or miss direction". Please take note UTubers, this is how to speak when doing a tutorial. The instructions were so sharp and clear that even the accent didn't deter me from perfect comprehenson of the subject. The 4nec2 program is excellent and if you are having problems, this clear tutorial should be of great help. If you are even more confused and put off by the apparent complexity of this program, then just start with any antenna selected from the ( File, new, models, menu) list of examples in the file lists... Just play with the sample antenna chosen and do some sweeps using the blue highlighted calculator button at the top of the main page. You can model your own antenna design by doing some simple modifications from an example antenna befor getting too seriouse with the data inputs as shown here. Excellent tutorial, my only negative comment is the skipping over some of the other sections at the end of the tutorial. My own personal question is. Can i model a balun 4:1 fed ocfd antenna? In other words i want to see the true swr figures for an antenna fed through a 75 ohm coax and a 4:1 guenella balun at the antenna feed point.. Is this possible.?
Colin, thanks for your comment. I spend a lot of time to remove all my "errs and ums" and lots of editing and reshoots. With regard to your question: To be honest I do not know, but my gut feeling says it is possible. I learn by looking at the examples and how others have done it. Unfortunately, I have not found detailed video's or online tutorials explaining these concepts.
Excellent job. At last a clear, in focus and useable tutorial. Well done sir. This is how to do videos... And the first to include how to insert components properly... Great job.. Thankyou.
Great tutorial! Good job! I would like to ask: where do you set the impedance of source? E.g. when you use 50 Ohm cable for your antena the results (VSWR) should be calculated for this specific impedance.
I think (I am not 100% sure) in the LD card (LD 4 ....). Download qsl.net/4nec2/4nec2zip.zip and go to folder 4nec2/models and search the examples (*.nec) how this is done...
Sir , Is it possible to create an output variable like the input variable so that like for example we can get different values of current induced at the load of receiving antenna , for different frequencies generated at the optimizer...and also why it is not possible for us to see the frequency of the field produced by the transmitting antenna?
Hi sir, your tutorials are nice, How to use Dragino LoRa Shield using STM32F401RE (using Kiel IDE ). Please put one sample video about this and integrating with TTN, Thanks in advance
Well how wrong was I, half way through the video, the on screen images become blurred, hard to read, also jumping from a text page to the screen you say click this button ( 24.3) and the button is allready actuated so we wast time trying to locate what button you pressed. And you flash up info that dissapears in under 1 second.. So we have to try and freeze the video exactly to the second to be able to read it... Bad editing.... Im sure you could do better, and you started showing the feed line, (every antenna has a feed line or coax) but then you say you dont use one and delete it from the model.... So how are we to use the calculator if you remove an important part of the antenna system... Finally your antenna made on a n connector is not as modeled, you have L shaped elements, and this equates to a feed line, though at these dimentions its just like a 1/4 wave antenna badly loaded... Yes if you bend the elements up the swr will be at 1:1 at a frequency below your calculated one. If you have 4 radials from a n connector pointing outward and the 1/4 element vertical its a 1/4 wave gp, the swr will be 1.8 or higher, but by bending the 4 radials down at 45 deg the swr will drop to 1:1. Now compair against your n connector side by side, both have similar dimentions and you will find the actual gain figures are very close. I would even bet the 4 radial gp 1/4 wave out performs your badly concieved version of a dipole. No swr over 1.5 :1 should be accepted, if you are designing a good antenna then dont accept anything over this value. I see so many people running 2 vswr and higher... Well thats up to them but its no optomised. 25% loss when 2% loss is acheivable. Please do a in focus video showing how to create the feed point using a balun, feed line in coax and how to add a series lc across the feed point on the wires. Thankyou..
This video saves 100 hours of research on how to use 4NEC2 software.!!
Wow, At last a clear precise tutorial. Not a single " errr, um, or miss direction".
Please take note UTubers, this is how to speak when doing a tutorial.
The instructions were so sharp and clear that even the accent didn't deter me from perfect comprehenson of the subject.
The 4nec2 program is excellent and if you are having problems, this clear tutorial should be of great help. If you are even more confused and put off by the apparent complexity of this program, then just start with any antenna selected from the ( File, new, models, menu) list of examples in the file lists... Just play with the sample antenna chosen and do some sweeps using the blue highlighted calculator button at the top of the main page.
You can model your own antenna design by doing some simple modifications from an example antenna befor getting too seriouse with the data inputs as shown here.
Excellent tutorial, my only negative comment is the skipping over some of the other sections at the end of the tutorial.
My own personal question is.
Can i model a balun 4:1 fed ocfd antenna? In other words i want to see the true swr figures for an antenna fed through a 75 ohm coax and a 4:1 guenella balun at the antenna feed point.. Is this possible.?
Colin, thanks for your comment.
I spend a lot of time to remove all my "errs and ums" and lots of editing and reshoots.
With regard to your question:
To be honest I do not know, but my gut feeling says it is possible.
I learn by looking at the examples and how others have done it.
Unfortunately, I have not found detailed video's or online tutorials explaining these concepts.
THANK YOU! Excellent tutorial for a beginner. You explain everything clearly, that is very rare.
Thank you! This is exactly what I was looking for!
Excellent job. At last a clear, in focus and useable tutorial. Well done sir.
This is how to do videos... And the first to include how to insert components properly... Great job.. Thankyou.
Thanks for this in-depth tutorial ... I've dabbled with 4nec2 but I learned a lot especially all of the things you can do with variables/symbols
This is the best tutorial I've seen on 4nec2 thus far. Thank you much! How do we change the impedance for 75 Ohm systems?
Great guide! When adding a source, how do you define the center connector side of the wire and the ground connection side?
Thank you for this video tutorial! It was very helpful for me.
Why You didn't use the balun to balance and avoid cable to radiate ?
Excellent video, thank you!
Great tutorial! Good job!
I would like to ask: where do you set the impedance of source? E.g. when you use 50 Ohm cable for your antena the results (VSWR) should be calculated for this specific impedance.
I think (I am not 100% sure) in the LD card (LD 4 ....). Download qsl.net/4nec2/4nec2zip.zip and go to folder 4nec2/models and search the examples (*.nec) how this is done...
Thank you so much!
hello. Can you help me with a project please . Your tutorial is very useful but i can reach the steps to design an antenna.
Great video !!! btw is it possible to design a microstrip patch antena using 4nec2?
Unfortunately you can not.
@@Mobilefish Thanks a lot Sir!!!
Sir , Is it possible to create an output variable like the input variable so that like for example we can get different values of current induced at the load of receiving antenna , for different frequencies generated at the optimizer...and also why it is not possible for us to see the frequency of the field produced by the transmitting antenna?
Hi sir, your tutorials are nice, How to use Dragino LoRa Shield using STM32F401RE (using Kiel IDE ). Please put one sample video about this and integrating with TTN, Thanks in advance
Hi Karthik, sorry but I do not have such a shield.
@@Mobilefish Thanks for your reply sir, hope waiting for further LoRa Videos
tq sir
Well how wrong was I, half way through the video, the on screen images become blurred, hard to read, also jumping from a text page to the screen you say click this button ( 24.3) and the button is allready actuated so we wast time trying to locate what button you pressed. And you flash up info that dissapears in under 1 second.. So we have to try and freeze the video exactly to the second to be able to read it... Bad editing.... Im sure you could do better, and you started showing the feed line, (every antenna has a feed line or coax) but then you say you dont use one and delete it from the model.... So how are we to use the calculator if you remove an important part of the antenna system... Finally your antenna made on a n connector is not as modeled, you have L shaped elements, and this equates to a feed line, though at these dimentions its just like a 1/4 wave antenna badly loaded... Yes if you bend the elements up the swr will be at 1:1 at a frequency below your calculated one. If you have 4 radials from a n connector pointing outward and the 1/4 element vertical its a 1/4 wave gp, the swr will be 1.8 or higher, but by bending the 4 radials down at 45 deg the swr will drop to 1:1. Now compair against your n connector side by side, both have similar dimentions and you will find the actual gain figures are very close. I would even bet the 4 radial gp 1/4 wave out performs your badly concieved version of a dipole. No swr over 1.5 :1 should be accepted, if you are designing a good antenna then dont accept anything over this value. I see so many people running 2 vswr and higher... Well thats up to them but its no optomised. 25% loss when 2% loss is acheivable.
Please do a in focus video showing how to create the feed point using a balun, feed line in coax and how to add a series lc across the feed point on the wires. Thankyou..