So what are you using? Even still, the explanation in the ENEC manual , which is available without purchase, is a good source of how things work within the NEC engine.
Rick <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Thu, Dec 3, 2020 at 6:43 PM Jonathan Guthrie via BVARC <[email protected]> wrote: > Just one comment. I'm not using EZNEC because I don't know if it'll run > on my computer without a lot of hassle. > > On 12/2/20 11:19 AM, Rick Hiller via BVARC wrote: > > Hey, Jonathan, > > That is exactly how you are to do it. One point though, you do not have > to specify the exact segment to place it. Just give the LOAD window a > "percentage from the end" and it will place it close enough. However, If > you do have the 500 segment version you can place it exactly where you wish > by using many segments to define the element. > > Definitions and How To's --- In EZNEC, go to Help/Contents and click on > LOADS / RLC and LOADING COILS and also TRAPS. There are good > explanations of each implementation and probably more detail than you want > if you follow all of the subsequent links. > > GL and 73...rick > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> > > On Wed, Dec 2, 2020 at 10:13 AM Jonathan Guthrie via BVARC < > [email protected]> wrote: > >> I got a question about analyzing antennas with traps and loading. >> >> If you're familiar with the book "The Short Vertical Antenna and Ground >> Radial" by Sevick, I simulated one of the antennas he wrote about in an >> NEC2 system and I think I got it right, but the way that you put traps and >> loading coils and such into NEC is not well described anywhere that I could >> find, nor are there many examples with simple antennas that have any >> loading coils. If you're not familiar with the book, or you're interested >> in which antenna, Sevick describes a 40m antenna that's right at 6 feet >> tall with a cap hat on the top and a loading coil in the middle. The way I >> modeled this is by having a single wire from near the ground to the top of >> the antenna and then one wire for each of the eight spreaders in the cap >> hat and a wire between each of the ends of the spreader. I arranged the >> elements such that the coil is near the center of one of the segments in >> the vertical wire and I put a lumped inductance on that segment. It seems >> to work, in that I got SWR curves that are similar to what's in the book, >> but is that how you're supposed to do it? >> >> Similarly, with a trap dipole, I just have one wire and put an >> appropriate capacitor and inductor in parallel at the center of the desired >> segments. >> On 12/1/2020 8:35 PM, Rick Hiller via BVARC wrote: >> >> Comments on your suggestions: Sorry for the length. >> >> *MiniNEC, EZNEC, 4NEC2, MMANA-GA*L are all based on the NEC computation >> engine. What differs is the interface to you, the user. I prefer EZNEC >> but then I have been using it for about 20 years. >> >> Cost for the Ham Radio level versions: EZNEC DEMO is free but with >> severe limitations for all but very simple antennas. $99 gets you to a >> quite useable version. 4NEC2 is totally free. MiniNEC is $29. MMANA-GAL >> is 139 Euro's, There are PRO versions and interface add-ons from various >> 3rd parties for most of the modeling engines. Just like my comment about >> the Nano VNA, in that it's gonna take some time to understand its' use and >> even more time to study antenna systems to understand what you are doing >> and why and how -- same goes for modeling software. But....certainly all >> in good fun and ham education and well worth the journey. >> >> *Folded dipoles a*re simply a way to get a match to 300 ohm TL. No >> advantage in gain , etc. Maybe slightly quieter on receive...maybe. >> TTFD is a different fish. >> >> *Books: *ARRL Antenna Handbook is certainly the antenna >> builders/users bible. You can however buy the Kindle version of each of >> the separated set books, so you don't have to spend the $60. Most of the >> theory is the same in these new editions versus going back to the 70's and >> before. The practical side of antennas with new materials, etc. is what >> gets upgraded with each new edition. Old versions of the ARRL antenna >> manual can be had for $10 typically. You can't go wrong buying any older >> version. >> >> If I had to steer you to books to read to get you up to speed about your >> total antenna system -- ATU, TL, tools, and grounding, I would tell you to >> get the following ARRL Joel Hallas and Ward Silver books: >> The Care and Feeding of Transmission Lines -- Hallas >> Understanding your Antenna Analyzer -- Hallas >> ARRL Guide to Antenna Tuners -- Hallas >> Grounding and Bonding for the Radio Amateur -- Silver >> >> I'd tell you to read and understand these before jumping into a NanoVNA, >> of which there is also a small book on the use of the NanoVNA. Kindle >> version available for $4 or thereabouts. >> >> Sorry for the bandwidth, but I don't agree with just buying something >> just because it is suggested. There is alot to learn in Amateur Radio and >> it is certainly fun to have a continual information influx throughout the >> life of your Ham Radio journey. But watching the $'s helps you buy bigger >> toys later on. >> >> GL ES 73....Rick -- W5RH >> >> >> >> >> >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> >> Virus-free. >> www.avast.com >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> >> >> On Tue, Dec 1, 2020 at 1:16 PM KJ Anderson via BVARC <[email protected]> >> wrote: >> >>> >>> - MiniNEC pro analyzer >>> - >>> >>> http://www.blackcatsystems.com/software/mininec-antenna-analysis-modeling-software.html >>> - DX Commander >>> - https://www.m0mcx.co.uk/ >>> - Folded dipoles (couldn’t google a site reference other than the >>> actual antenna form) >>> - EZNEC >>> - https://www.eznec.com/ >>> - There’s a free version >>> - ARRL Antenna Physics >>> - >>> http://www.arrl.org/shop/Antenna-Physics-An-Introduction-2nd-Edition/ >>> - http://www.arrl.org/shop/ARRL-Antenna-Book-Boxed-Set/ >>> >>> >>> >>> *-------------------------------------------------* >>> >>> *KJ Anderson* >>> >>> 253-380-2636 >>> >>> www.linkedin.com/in/scrumnerd >>> >>> >>> >>> >>> ________________________________________________ >>> Brazos Valley Amateur Radio Club >>> >>> BVARC mailing list >>> [email protected] >>> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >>> >> >> >> -- >> Rick Hiller >> *e-mail: [email protected] <[email protected]>* >> *Cell: 832-474-3713* >> *Physical: 9031 Troulon Drive* >> * Houston, TX 77036* >> >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing >> [email protected]http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> >> ________________________________________________ >> Brazos Valley Amateur Radio Club >> >> BVARC mailing list >> [email protected] >> http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org >> > > > -- > Rick Hiller > *e-mail: [email protected] <[email protected]>* > *Cell: 832-474-3713* > *Physical: 9031 Troulon Drive* > * Houston, TX 77036* > > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing > [email protected]http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > > > -- > Jonathan Guthrie > ARS KA8KPN > > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > -- Rick Hiller *e-mail: [email protected] <[email protected]>* *Cell: 832-474-3713* *Physical: 9031 Troulon Drive* * Houston, TX 77036*
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