EZNEC Files to Download but Potential Pitfalls to Observe!

EZNEC Files Introduction:

Here I’ve enclosed some various EZNEC files for download. Rather than just republish some of the many freely available EZNEC designs online, we’ve enclosed some of our own – in particular ‘Vortex’ models by Steve, G0UIH and some previously published models by other designers, but remodelled by us with our own enhancements, tweaks and updates. None of the ‘Vortex‘ or ‘G0UIH‘ models have been previously published.

We plan to add further models as time progresses so it’s worth coming back here on a regular basis to check on updates.

Constructor Notes:

It’s a known fact that EZNEC, EZNEC+ and EZNEC Pro/2 models [can in some circumstances] be inaccurate as they use the NEC2 calculating engine. We can’t determine what the exact accuracy is as it varies with differing models and in particular models with tapered elements using the ‘Taper Correction’, coupled with wires at acute angles AND coated wires. All these variants just add to the potential errors.

We have done our own research over many years, particularly on Delta Loops and can [confidently] determine how far ‘OUT’ the modelling is. As such, we have compensated for the anomaly in our live builds. Builds on the site with ‘DATA SHEETS‘ are ‘FINAL ACTUAL BUILDS‘ and as such we circumvent the EZNEC results. That’s why [mainly] there’s very few ‘Delta Loop’ modelling files here.

If you followed them, you’d get poor results. No point in giving you non-accurate data. The ones listed are really a reference/starting point only and should be considered just that and NOT be thought of a final design.

On the flip-side, we found that for designs that predominantly use straight wires and none [or very little tapering] – the design comes pretty close. It’s really down to experimentation but Delta Loop builders should take note on the above comments.

Just think of the following scenario. EZNEC is the first ‘building block‘ in an actual working design. From the initial model, we then eek out an actual live build to get a real world working result. Then we throw a custom-built 12 point ‘Field Strength’ system at it which was built by a PhD friend who has far more marbles than I have! He has assisted and helped advance the project with great live-builds. We can now be pretty sure of the actual ‘REAL-WORLD’ performance of any antenna that’s designed.

Change a length anywhere on the array, and the field strength reports back the results. The coupled analyser also shows any live SWR, Impedance, Reactance and Bandwidth changes. So constructors should be aware. Modelling is just that – nothing more. It isn’t proven until you’ve build it, measured it and honed it.

Constructors should note that the EZNEC models available for download here are NOT compensated for any of these issues.

We have have spend many hours whilst in business, field testing each EZNEC design. We’d say, if you’re building a Delta Loop, Quad or basically anything that isn’t ‘Flat or Bare Wires’- then EXPECT ERRORS, unless you’re using an NEC4 calculating engine. If it’s a Yagi then any variations to the model will be smaller and will be easier to handle.

As a home-brew constructor, you’ll need to put in time and effort to figure out where the issues lie, but use our advice [with the Delta Loop in particular]. EVERYTHING in NEC2 resonates high. At 28 MHz it’s about a factor of 1.73%.

As a reference. EZNEC says the resonant ‘Dip‘ on a single 10m loop constructed of 16 and 12mm tubing with a section a 2mm ‘Flexweave’ top wire [With 1mm of PVC coating] will have a total circumference of xxxm. In the real world its xxm. So CONSTRUCTOR BEWARE!!!!!

EZNEC Files Available to Download:

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15m 3 Elements Lightweight Yagi [G0UIH]. View the plot here. Build it here.

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11m 4 Elements Yagi – LoZ, 5m Boom. Match with Hairpin. [Vortex]. View the plot here.

10m 6 Elements OWA Yagi [Vortex]. View the plot here. Build it here.
10m 3 Elements Wideband Yagi [Vortex]. View the plot here.
10m 2 Elements HD Delta Loop [Vortex – Dev]. View the plot here. Example [Not a live build]

6m 2 Elements [Driver/Reflector] Yagi [Vortex]. View the plot here.
6m 2 Elements DK7ZB Yagi using 16 and 12mm tubes. View the plot here.
6m Single Element ‘Oblong’ – Over 4.00dbi [Vortex]. View the plot here.

4m 5 Elements Yagi. 33ohm – Match with Hairpin. [Vortex]. View the plot here.
4m 7 Elements Yagi. Low ‘Z’ 12.5ohm [Vortex]. View the plot here.

2m ‘Triple 5/8ths Collinear’ Vertical. 6.58dBi [G0UIH]. View the plot here. Build it Here.
2m OWL Yagi – 10 Elements [G0UIH]. View the plot here. Build it Here.

Other Bands/Miscellaneous Designs
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