Fw: MB Antenna NEC File
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Here is Martin's response to my request for NEC file for modeling his antenna using 4NEC2. Dave W6VYC ----- Forwarded Message ---- From: Martin Hedman
To: dwcae@... Sent: Mon, July 12, 2010 8:07:05 PM Subject: Re: MB Antenna NEC File Hello Dave! Glad to see that you enjoyed my article in QST and that you have build a 20 meter version of the antenna. Please see attached nec-file for 21 MHz. I have used a thin insulated wire which is light and strong but puts my resonance frequency 6 procent in difference when modelling and in real. So when modelling the included file you will se that it resonance on 22.6 MHz but in real with my wire used it resonance on 21.2 MHz. So resonance QRG depends on what kind of wire you use. I have built many versions of the antenna but never needed some kind of balun. At the moment I have one MH-antenna for 21 MHz and one for 18 MHz and they works nice with SWR 1,0 and good bandwidth. Good luck with your project! 73 de Martin
<-----Ursprungligt Meddelande----->
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David W Crocker