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Re: Off topic nanoVNA: EZNEC
Yes, although 113 members is over the 100 member limit for a basic group.
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On Oct 14, 2022, at 09:14, va3rr via groups.io <va3rr@...> wrote: |
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Re: Totally Lost!
Windows - Yesterday it worked, today is doesn't.? Windows is like that.
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W4CWZ On 10/13/2022 4:42 PM, Bill KD2RZW via groups.io wrote:
I honestly do not have a clue what the hell I did but I figured it out? HAHA. I removed everything and started from the beginning again. I really don't like this result because I cant explain myself and this does no good to anyone who comes across this thread but I will not complain. Now I have to select the firmware to go with.. --
"The United States has become a place where entertainers and professional athletes are mistaken for people of importance." |
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Re: Off topic nanoVNA: EZNEC
On 10/14/22 2:25 AM, F1AMM wrote:
4nec2 is much less efficient than EZNEC. EZNEC offers, in particular, a very good antenna geometry editor. EZNEC "opens" .NEC files but unfortunately they are only rarely compatible because 4nec2 authorizes variables in GW cards (lines) which EZNEC does not support.I prefer 4nec2's interface and it works well with other engines (e.g. NEC4.2) It's probably more of a personal preference thing. |
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Re: Antenna tuning in field, calibration with SMA cal set followed by BNC and UHF adaptors
Michael Black
The S11 minimum return loss does not indicate resonance.? Common mode current can affect the value and thus the SWR and mislead you when you are not measuring at the antenna.Only J0=0 indicates resonance.??
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Mike W9MDB On Friday, October 14, 2022 at 07:00:17 AM CDT, Donald S Brant Jr <dsbrantjr@...> wrote:
If you just need to tune an antenna "on frequency" you do not even need to calibrate your VNA; it will show the S11 return loss dip at the correct frequency; the magnitude will be wrong but it is not relevant in this case, you are only looking ofr a minimum.? I do this when tuning my loop antenna and it works fine.? At HF, the error intorduced by adding an adapter after calibration is small.? 73, Don N2VGU |
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Re: Off topic nanoVNA: EZNEC
That's unfortunate. I am a subscribed member, and the general info page for this group indicates:
"[email protected] (disabled because this group cannot add any more members)" and there's only 113 members... va3rr |
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Re: Off topic nanoVNA: EZNEC
If has probably reached the membership limit for the group type. The only thing I can think of is to retry joining every so often in case someone drops out of the group.
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DaveD On Oct 14, 2022, at 08:57, F1AMM <18471@...> wrote: |
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Re: Off topic nanoVNA: EZNEC
F1AMM
For that information, I would go to the 4NEC2 group.** It begins badly 4NEC2 displays This Group Cannot Add Any Members 4nec2defguide is open but 2 messages in 2022 and 1 message in 2021 Your advice please Sidenote.. I still prefer mmana** MMna, I gave. It does not know how to calculate an impedance on a real ground. MMna assumes a conductive ground. -- F1AMM Fran?ois -----Message d'origine-----De la part de Dave Daniel et de Siegfried Jackstien 14 octobre 2022 14:37 |
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Re: Off topic nanoVNA: EZNEC
Sidenote.. I still prefer mmana
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Easy graphical editor Lots of functions Free Dg9bfc sigi Am 14.10.2022 14:36 schrieb Dave Daniel <kc0wjn@...>:
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Re: Off topic nanoVNA: EZNEC
As I wrote earlier, I haved used EZNEC but not (yet) 4NEC2, so I can¡¯t advise you about versions and documentation for 4NEC2. For that information, I would go to the 4NEC2 group.
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DaveD On Oct 14, 2022, at 08:17, F1AMM <18471@...> wrote: |
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Re: Off topic nanoVNA: EZNEC
F1AMM
That is a superficial comparison of the two simulators. Now that you are a member of theThanks for your advice. I had started using 4nec2. I switched to EZNEC because there was a notice that I translated into French. The version of 4nec2 that I have is 5.9.3 Is this the correct one? I have the documentation NEC-2 Manual, Part III: User's Guide (nec2.doc) It is marked WDBN 0.92 Is there any other documentation besides 4nec2.chm? I will watch 4nec2 again. At the time I thought I was going crazy with the cards but I got used to it. 73 -- F1AMM Fran?ois -----Message d'origine-----De la part de Dave Daniel vendredi 14 octobre 2022 12:26 |
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Re: Antenna tuning in field, calibration with SMA cal set followed by BNC and UHF adaptors
If you just need to tune an antenna "on frequency" you do not even need to calibrate your VNA; it will show the S11 return loss dip at the correct frequency; the magnitude will be wrong but it is not relevant in this case, you are only looking ofr a minimum. I do this when tuning my loop antenna and it works fine. At HF, the error intorduced by adding an adapter after calibration is small.
73, Don N2VGU |
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Re: Off topic nanoVNA: EZNEC
That is a superficial comparison of the two simulators. Now that you are a member of the ham-antennas group, you should find and read the posts in that group from W0LEV comparing the two simulators.
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The bottom line is that 4NEC2 will give ¡°better¡± results, but is much more difficult to learn. Caveat: I¡¯ve been using Roy¡¯s EZNEC for decades but have never used 4NEC2 (I have downloaded it and plan to start learning it at some point in the future when I am ready to erect antennas on my new property). I know Dave Eckhardt, W0LEV, pretty well, having worked in the same location as he did at StorageTek in CO and having had many personal conversations with him over the years about antennas and propagation. One should read his posts carefully. He is very knowledgeable about antennas and antenna modeling. DaveD On Oct 14, 2022, at 05:25, F1AMM <18471@...> wrote: |
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Re: Off topic nanoVNA: EZNEC
F1AMM
The ham-antennas group often discusses antenna modeling using EZNEC and/or 4NEC2,Thanks a lot. I just subscribed to this group and will read the posts. This is probably a solution to my communication difficulties. I'll be sure to keep you posted. -- F1AMM Fran?ois -----Message d'origine-----De la part de Dave Daniel 14 octobre 2022 11:15 |
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Re: Off topic nanoVNA: EZNEC
F1AMM
4nec2 is much less efficient than EZNEC. EZNEC offers, in particular, a very good antenna geometry editor. EZNEC "opens" .NEC files but unfortunately they are only rarely compatible because 4nec2 authorizes variables in GW cards (lines) which EZNEC does not support.
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Now that EZNEC is "free", we must abandon 4nec2 as we abandoned MMANA-GAL Basic for 4nec2. -- F1AMM Fran?ois -----Message d'origine-----De la part de Joseph DiVincenzo 14 octobre 2022 11:05 |
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Re: Off topic nanoVNA: EZNEC
There is also a 4NEC2 group which is slightly (but not mgch) more active than the EZNEC group.
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The ham-antennas group often discusses antenna modeling using EZNEC and/or 4NEC2, among others. There is more discussion about those simulators on that group than either of the NEC groups. DaveD On Oct 14, 2022, at 01:13, F1AMM <18471@...> wrote: |
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Re: Off topic nanoVNA: EZNEC
As an alternative, you might take a look at 4nec2.
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There is some information about the 4nec2 application and the classes our Rochester NY Amateur Radio Service club is running for Antenna Modeling just 4nec2 on our website, rochesterham.org. The instructor said he is familiar with EZNEC as well. 73 Joe AD2DB On Fri, Oct 14, 2022, 1:52 AM F1AMM <18471@...> wrote:
Thank you for your reply. I understand the situation better and I was |
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Re: Off topic nanoVNA: EZNEC
F1AMM
Thank you for your reply. I understand the situation better and I was right to ask the question here.
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I guess HFSS and CTS are unaffordable on QSJ side by amateurs. It's funny to see that a hobbyist now has a VNA that cost a fortune 50 years ago and to see this transfer of wealth to the software. Question : For an amateur, the solution is good, at best, with EZNEC or are there other solutions (free). -- Fran?ois -----Message d'origine-----De la part de KENT BRITAIN 14 octobre 2022 07:25 |
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Re: Off topic nanoVNA: EZNEC
Hi Francois
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I worked with Roy at Tektronix 25 years ago and have been using ELNEC then EZNEC for 28 years. Good to see there is a EZNEC group, I wondered about that since Roy is 100% out of the software game. Yes, have downloaded the Pro version he has made open software, and yes, that is quite a manual. I understand the low activity.? Really serious antenna designers have moved on to HFSS and CST type programs. Kent WA5VJB On Friday, October 14, 2022 at 12:13:42 AM CDT, F1AMM <18471@...> wrote:
Hello I carefully follow the exchanges on /g/nanovna-users I see that many are also tinkering with the antennas. I'm taking my first steps with EZNEC. I translated Roy W. Lewallen's documentation into French by redoing the exercises he prescribed. Roy's document is huge because it includes a lot of modeling tips based on his experience. As the software remains in English, I have integrated many (partial) screenshots into the translation. I'm writing tutorials (in French) that don't follow Roy's pedagogical progression. I do this mainly for me in order to make progress in my learning a reality. I registered on /g/eznec This group does not work. There is almost no trading (interchange ?) on it (September 3/September 15). I asked a question there on September 23 but did not get a satisfactory answer. - Do you use EZNEC? - Do you know of a newsgroup that would work as well as nanovna-users but deal with EZNEC? -- F1AMM (Fran?ois) |
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Off topic nanoVNA: EZNEC
F1AMM
Hello
I carefully follow the exchanges on /g/nanovna-users I see that many are also tinkering with the antennas. I'm taking my first steps with EZNEC. I translated Roy W. Lewallen's documentation into French by redoing the exercises he prescribed. Roy's document is huge because it includes a lot of modeling tips based on his experience. As the software remains in English, I have integrated many (partial) screenshots into the translation. I'm writing tutorials (in French) that don't follow Roy's pedagogical progression. I do this mainly for me in order to make progress in my learning a reality. I registered on /g/eznec This group does not work. There is almost no trading (interchange ?) on it (September 3/September 15). I asked a question there on September 23 but did not get a satisfactory answer. - Do you use EZNEC? - Do you know of a newsgroup that would work as well as nanovna-users but deal with EZNEC? -- F1AMM (Fran?ois) |
va3rr
Donald S Brant Jr
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