The W8IO Antenna Site

Antenna Modeling, LPCAD and YAGio

(14 March 2022)

Russia began a full-scale invasion of Ukraine on 24 February 2022, in an escalation of the Russo-Ukrainian War that began in 2014. The invasion is the largest conventional military attack on a sovereign state in Europe since World War II. Since the beginning of Putin's war, thousands of both Ukraine and Russian citizens have been killed. Russian military have indiscriminately bombed cities in Ukraine, destroying many hospitals and schools. Our heart goes out to the 2.7 million plus refugees that have left Ukraine for neighboring countries, and those who stayed to fight the Russian invaders.

Rossiya nachala polnomasshtabnoye vtorzheniye v Ukrainu 24 fevralya 2022 goda v ramkakh eskalatsii rossiysko-ukrainskoy voyny, nachavsheysya v 2014 godu. Eto vtorzheniye 
yavlyayetsya krupneyshim voyennym napadeniyem s primeneniyem obychnykh vooruzheniy na suverennoye gosudarstvo v Yevrope so vremen Vtoroy mirovoy voyny. S nachala putinskoy 
voyny pogibli tysyachi grazhdan Ukrainy i Rossii. Rossiyskiye voyennyye bez razbora bombili goroda Ukrainy, unichtozhiv mnozhestvo bol'nits i shkol. My sochuvstvuyem boleye 
chem 2,7 millionam bezhentsev, pokinuvshikh Ukrainu v sosedniye strany, i tem, kto ostalsya srazhat'sya s rossiyskimi okkupantami.

Россия начала полномасштабное вторжение в Украину 24 февраля 2022 года в рамках эскалации российско-украинской войны, начавшейся в 2014 году. Это вторжение является крупнейшим 
военным нападением с применением обычных вооружений на суверенное государство в Европе со времен Второй мировой войны. С начала путинской войны погибли тысячи граждан Украины 
и России. Российские военные без разбора бомбили города Украины, уничтожив множество больниц и школ. Мы сочувствуем более чем 2,7 миллионам беженцев, покинувших Украину в 
соседние страны, и тем, кто остался сражаться с российскими оккупантами.

This project consists of an attempt to design Narrow-Band Optimized Log-Periodic Dipole Arrays which have the same or better performance characteristics (VSWR, Gain, Front-to-Back, Front-to-Rear, high G/T, etc) as those of a similar boom-length monoband Yagi.  I call this new type of antenna - Loggi (Log - Yagi).  

For details on a 20m Loggi, follow this link:  Optimized-LPDA

YAGio version 1.00 is now available!   YAGio runs fine under Windows 2000, XP, Vista and Windows 7.  Follow the link or email me at rgcox2 (at) gmail.com for details.

updated 4 April 2015

LPCAD version 3.5 is now available!  LPCAD 3.5 runs fine under Windows 2000, XP, Vista, Windows 7 and 8.  Follow the link or email me at rgcox2 (at) gmail.com for details.

updated 22 July 2015

Here is some information on one of the first antenna simulation programs to run on home computers in the 1980's.  Mininec-3

NEC Benchmarks

Here is some benchmark information for NEC based on various CPU's and 4NEC2 engines  NEC-Benchmarks

VHF-UHF Operating Aids

Here is a collection of links to VHF-UHF operating aids 

VHF-UHF Operating Aids

VHF-UHF Operating in Michigan

How to use 4NEC2 with TANT

How to use 4NEC2 with TANT - W8IO

My Unofficial list of NEC and MININEC software

This list includes links to EZNEC, NEC4WIN, Super NEC, 4NEC2 and many others. NEC/MININEC Software List

NEC Model Library

The link points to NEC/AO/YO models of various Ham antennas that I have simulated and/or tested over the past 39 years as an antenna design engineer. 

NEC/MININEC Software and Files List

W8IO Download Page

Here are some of the files available for download

Comments are welcome!

rgcox2 (at) gmail.com

Roger Cox W8IO - Spring Lake, MI