KnowledgeQuest - Yagi Antenna Design
Experiment with Yagi designs on your computer!
WAIT!! If you came to this page directly from a search engine or link, you're missing out on hundreds of pages of amateur related info on our server. CLICK HERE, or click the floating TEARA link on the page, to move to the top of our site. From there, you can select 'KnowledgeQuest', and return to this page, complete with all of our site navigation tools. Enjoy your visit with TEARA!
There are many software packages on the internet useful in designing various types of antennas. I've been playing with a software package named "YagiCad 4.1" since about 1992. I first installed a copy of it on our TEARA webpage back in late 1994. Since then, I've received many emails from users of this software who praised it's performance and simplicity. Here, many years later, I find myself updating this website with 'work-arounds' and tips, as the user base continues to grow. Seems the software's author has developed quite a following!
Yagicad 4.1 was written by Paul McMahon VK3DIP. It's shareware, so you can download it (and lots of antenna profiles) below. It's a DOS program and can be run outside of windows if you like. It requires a minimum of a 386 PC platform to run and a math co-processor really speeds things up, but isn't required. The program runs best in DOS ('real DOS, not the fake stuff rolled up inside of WIN95/WIN98/NT, hehehe) or when executed from WIN3.x, but there are simple 'work-arounds' for 95/98/NT users. As computers and operating system have become more complex, users have come up with methods of keeping Yagicad4.1 running. Despite a little bug with newer operating systems, I LOVE this program and have designed/built many antennas with it. I've used a lot of other programs, but find myself back using VK3DIP's YagiCad 4.1.
Hey, this is a great reason to drag out one of those older PC's you've had packed away, trying to figure out a 'real use' for it! I used to toss everything that wouldn't run on my newer computers, but have since discovered there were MANY great programs that were somewhat simpler to use and developed for the older PC platforms. Don't automatically discount software just because it won't run well on your newest machines or operating systems. Anyway, c'mon and lets get started with YagiCad 4.1!
Download YagiCad 4.1 here. This file will download as yagi.zip. Once the download is complete, unzip the file into an empty directory. To start the program, type yagi41 from the dos prompt (first, switch to the yagicad's working directory) or double click on yagi41.exe from your file manager in windows. First, before trying to start and run this program, read the rest of the notes and tips below.
The program has all the help files contained within, and can answer most questions. It will allow you to design a basic antenna based on a NBS antenna standard, and then scale it to your desired frequency. You can then modify element diamaters, boom length, match type, element spacing and lengths, etc. You can also generate E and H plane radiation plots. All data can be sent to a local printer. You can save your designs once complete.
Yagicad 4.1 comes with a host of sample antenna designs, thus allowing you to use a working design and simply scale it to your operating frequency. You can add or subtract elements, compensate for different element diameters, conductive or non-conductive booms, etc. A word of warning, however... When you open a sample antenna, click on "create" and name the antenna session to your own unique file name BEFORE you make changes (scale it, etc). Otherwise, your sample antennas will be forever modified. Remember, when you name a file, use 7 characters as outlined in Note #1 of 'NOTES FOR WIN95/98/NT USERS' above.
Once you've designed/modified your antenna, go to "calculate", select "auto", and then select "resonate". Set a residual reactance of 0.0 ohms. This step of the program will alter the driven element to be resonant at your target frequency. If the Actual "Z" (impedance) is not approximately 50 ohms, go to "edit" and move the location of the driven element back and forth on the boom a little and then resonate the driven element again. Continue this process until the actual Z is about 50 ohms.
You can add files that you and others design to your library for future reference. You can also store the designs of commercially manufactured antennas in your library and scale to other bands later. Below is a list of the supplied antenna designs (to replace yours when you forget tip #1 above, hehehe), and a few others I've added. If you scale or design any antennas of your own, send me a copy of the .yag file and I'll include them here for others to play with.
The following files are available from this page in 2 formats. The first is the .yag file in text format. You can copy the text from the page, paste it to a text reader like notepad, and save it as whatever.yag. Then move that file into your yagicad 4.1 program directory. You can also read the .yag file from here. The first info in the file is the title and description. The first number is the forward gain in db. The second number is the front-to-back ratio. The 3rd number is the actual impedance of the antenna. The 4th number is the reactance. The 5th number is the # of elements. The columns are: element length, distance from the end of the boom, and element diameter. All measurements are in meters.
Following the .yag file is the same file in a zip format that can be downloaded and unzipped directly into your .yag storage directory (may be 'template' if you're running yagicad4.1 on WIN95/98/NT, or the main Yagicad4.1 working directory if you're running it in DOS or Win3.x or lower).
Visit WB2HOL's Website for a full write up on this cool DF antenna built from a metal Tape Measure! Optimized on YagiCad.
Visit VK3VT Fox hunt beam from an article by Lawson in Ham Radio Magazine.
Other antenna design programs can be found on the TEARA software page.
RETURN to the main TEARA Webpage!
TEARA SITEMAP: For best site navigation click the Main Website
Entry link below, or select items from the menu on the LH side of the page...
Main TEARA Website Entry Point Club Website Main Page Membership Application An ARRL Club Repeater Bulletins Club Bulletins Zebulon Site Bulletins Club Constitution (html) Club Constitution (txt)k TEARA Members' Email VE TEST Schedule Listings for NC TEARA Members' Websites Support TEARA Meeting Site Map Club Meeting Schedule Net Information VE Team Bulletins Meeting Schedule TEARA VE Schedule Ham Radio License Classes TEARA's VE Team
Club Handbook Stuff...
Handbook Index Handbook Preface Handbook Welcome Membership Info Club History YOUR FIRST TRANSMISSION USING THE PHONE PATCH NEW RULES SPEED DIAL REVERSE PHONE PATCH
WB4IUY APRS Digi K4RTP-8 SEDAN Node in Zebulon W4RAL-4 BBS Node in Clayton W4RAL-7 BBS Node in Zebulon WB4IUY-7 6 Meter BBS Node near Youngsville Packet Radio Gateway info TEARa Packet Addresses Packet Radio Links W4RAL Packet BBS DX Cluster Info APRS Systems SEDAN Info Local Packet BBS Nodes Packet NOS DX Cluster Links APRS Links SEDAN Links NOS Links DX Cluster Nodes and Use APRS Packet Nodes SEDAN Nodes NOS Nodes Activity Using Packet BBS Nodes
WA4UQC 147.30 mhz Repeater in Wilson (sk) Pg.1 WA4UQC 147.30 mhz Repeater in Wilson (sk) Pg.2 The Retired WB4IUY 147.39 mhz repeater in Clayton New 147.39 repeater construction (pg.1) New 147.39 repeater construction (pg.2) New 147.39 repeater construction (pg.3) New 147.39 repeater construction (pg.4) New 147.39 repeater construction (pg.5) New 147.39 repeater construction (pg.6) New 147.39 repeater construction (pg.7) The NEW WB4IUY 147.39 mhz repeater in Clayton KD4WIW 224.80 mhz repeater in Zebulon WB4IUY 29.620 repeater in Zebulon (pg.1) WB4IUY 29.620 repeater in Zebulon (pg.2) KD4WIW 442.40 mhz repeater in Zebulon K4JDR 444.775 repeater in Cary Repeater Operation Info Repeater Linking System Area TEARA & Member Repeaters
ATV Links TV Frequency Allocations SEE YOU ON THE AIR! ATV Rabbits 2.4 GHz FM ATV RF Power Table ATV around central NC
Bear Wallow Mountain '94 Bear Wallow Mountain '95 Bear Wallow Mountain '96 Field Day Overview 1994 Field Day 1995 Field Day 1996 Field Day 1997 Field Day 1999 Field Day 2000 Field Day 2003 Field Day 2004 Field Day Special Event Info
DXing and QSLing Aids DX Callsign Search Page US Callsign Search Page External Callsign Search Engines KQ4MS Big Gun Party, 1 KQ4MS Big Gun Party, 2 KQ4MS Big Gun Party, 3 KQ4MS Big Gun Party, 4 KQ4MS Big Gun Party, 5 KQ4MS Big Gun Party, 6 KQ4MS Big Gun Party, 7 Propogation Info Page W4SIS Big Gun Party W4SIS Big Gun Party, 1 W4SIS Big Gun Party, 2 W4SIS Big Gun Party, 3 W4SIS Big Gun Party, 4 W4SIS Big Gun Party, 5 W4SIS Big Gun Party, 6 W4SIS Big Gun Party, 7 W4SIS Big Gun Party, 8 W4SIS Big Gun Party, 9 W4SIS Big Gun Party, 10 W4SIS Big Gun Party, 11 W4SIS Big Gun Party, 12 W4SIS Big Gun Party, 13 W4SIS Big Gun Party, 14 W4SIS Big Gun Party, 15 VHF / UHF Contests
General Amateur Radio Stuff...
FCC INFO PAGE FCC Part 97 Regs
Ham Radio Software Ham Radio Software Downeast Microwave Catalog (txt) Yagi Design Software
Home Brewer's Links Call Sign Servers CLASSIFIED ADs Atomic Clock NC AREA CLUBS Dealers' Links Radio Parts and Services TEARA's Links Catagories E-Zine Info Ham Radio Activities Ham Radio Newsgroups Ham Radio Reflectors Resistor Tutorial Ham Satellites Spread Spectrum Radio VHF / Weak Signal Links Vintage Radio Links
Supporters of the TEARA Website Costs...
Scootworks - Custom Accessories for Metric Motorcycles Granucci Motorcycle Saddles Granucci Motorcycle Saddles Granucci Motorcycle Saddles Granucci Motorcycle Saddles Granucci Motorcycle Saddles Vulcan Belt Drive Systems Suzuki Belt Drive Systems Honda Belt Drive Systems Belt Drive Systems for Metric Motorcycles Engine Guard Chaps and Crash Bar Chaps for Metric Motorcycles Pull back risers for motorcycles Scootworks Phatrisers for metric motorcycles Handlebar Risers for metric motorcycles Lowering Kits for metric motorcycles Tour Packs and Trunk kits for metric motorcycles Handlebar mounted beverage and drink holders for metric motorcycles