Excogi Gracie [work] - Full VVCs for Small Loop and Magnetic Loop Antennas magloop, magnetic loop, mag-loop, small loop, antenna, vvc, calculator Gan Uesli Starling 2019-2022, Gan Uesli Starling Small Loop Antenna Calculator

What range of MHz to expect from commonly available VVCs

home: ky8d.net/free

My own (as in yet another) calculator for small-loop transmitting antennas functions differently from all others. Hopefully in a way you will find handy. Focus is chiefly on tuning capacitor. Because once you have either rolled, brazed, or soldered the main loop into a unit whole, there’s no easy way to change that. Also, the loop you can make however you want. Your choices of tuning capacitor, though, can be very limited. Especially if you’re wanting to use a VVC.

Thus I present for your kind consideration my own contestant in an already well-packed arena. Two things it does better than most. Firstly that, for running in a continuous loop, there is no tiresome Calculate button to continually re-click. Secondly is that I have the highest personal confidence in its predictions for loop L (μH) and Cs (pF). This because of employing ultra-modern algorithms recently authored by Robert (Bob) Weaver and David Knight, G3YNH.

Ĝan Ŭesli Starling , KY8D

Mag-Loop? Small Loop?

What's in a name? I too was confused for a long time. But one is a sub-set of the other. And my calculator does both.

The designation magnetic loop specifies a main-loop circumference necessarily smaller than 0.05 λ, according to some. And by no means larger than 0.1 λ, according to many. Only when thus configured does the antenna enjoy deep side nulls.

Larger sizes still work very well. Better, even, if it's radiation efficiency you value most. The self same antenna, when tuned for higher frequencies, gradually loses its side-nulls while gaining higher efficiency. And therein lies a critical difference. Down low it's a magloop; up high it's only a small loop. The same basic antenna structure, but with two very different behaviors.

And magloops came first, their deep nulls important for use in direction finding. You see them in movies about WW2: atop Nazi trucks roaming through streets in search of French resistance cells; mounted on bombers following a radio beacon aimed out of England toward Dresden Germany to direct night-time fire-bombing raids. There is history in the special distinction.

And so, after having twice now suffered (and rightly so) polite harrangues from others much better in-the-know, I bow to the nomenclature gurus, re-naming my program for what truely it is: a calculator for small loop antennas (among which over-category magnetic loops are a particularly venerable sub-set).

The distinction becomes immensely important as circumference approaches λ/4 and larger. Because now it is hardly even a small loop, but increasingly something closer to curled-up dipole with mutually coupled capacitance hats. And still it will resonate. The radiation pattern, however, will by now be growing a lobe. So that unless it's our goal to shine a warming radiation upon worms or birds, then our capacitor will best be mounted at either three or nine o'clock instead of the usual six or twelve.

Download

You’ll need two things for it to run: my *.exe application itself, plus also the interpreter program on which it runs. Kind of like Java that way, except that the Java interpreter is probably pre-installed on your system. The LabVIEW run-time engine will not be.

  1. LabVIEW Runtime Engine
    • This is the interpretor program.
    • Or, should it please you, the entire LabVIEW programming environment.
    • Link back to ky8d.net/free where I give download instructions.
  2. KY8D Small Loop Calculator.exe
    • Important! After downloading, employ a stand-alone ZIP archive software (like 7-Zip) for extracting the *.exe file to somplace useful prior to trying to run it. Otherwise, Windows will issue dire warnings of an unrecognized app. Once extracted from out of its ZIP archive, however, Windows will know to pass it off to the LabVIEW Run-Time Engine instead.
    • Offered compltely free, utterly without any kind of a warrantee.
    • Release 2019-06-06 corrects previous error in calculation of Distributed Capacitance.
  3. LabVIEW Source Code
    • Open source. No rights reserved.
    • Yours to do just as you please with ... except any of the below:
      • Apply for a patent
      • File a copyright
      • Restrict other’s use by any means

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Links
  • Robert (Bob) Weaver
  • David W. Knight, G3YNH
    • G3YNH His resource home page.
    • G3YNH His 104-page PDF on inductor self-resonance.
    • G3YNH His 97-page PDF (still unfinished) on solenoid inductance.
  • Owen Duffy, VK1OD
    • VK1OD His blog’s home page
    • VK1OD His review of several (mostly older) small loop antenna calculators.
  • Chemandy A suite of several on-line calculators.
  • LabVIEW 32-bit, version 2018 SP1.
    • Free 7-day evalutation period of this $4k-plus professional software.
    • Extend that to 30 days by registering for an account.
  • OpenOffice
    • David Knight’s math functions are coded in BASIC for *.ods spreadsheets.
    • Bob Weaver likewise offers a number of *.ods spreadsheets.
    • The spreadsheet program’s macro editor allowed me the luxury of ad-hoc testing individual functions in BASIC.
      • Without my having to learn more than two lines of BASIC.
      • Made bug-hunting in my trans-coded LabVIEW super easy. Trial inputs to both; done when both outputs agree.
    • It’s free on both Windows and Linux.
      • At home I have three Linux boxen and only one for Windows 10.
      • I choose not to spend any more money on Windows than absolutely I must.
      • I run Windows only for these:
        • LabVIEW
        • Rhinoceros 3D CAD
        • Solidworks 3D CAD
  • vDos
    • For running MS-DOS programs on Windows 10. Such as, for instance...
    • G4FGQ Archival page of DOS programs authored by Reg Edwards, G4FGQ (SK 2006). Maintained now by K3HRN.
To-Do List
  • Compensation for height above ground.
    • Fully explained math examples are sorely needed.
    • I flat out refuse to simply multiply loop diameter by a constant.
  • Any further requests? Send me an email.
Why LabVIEW?

Because I don’t know either BASIC or Python. And my skill in Perl is quite modest; not up to anything quite this complex. Especially not when it comes to the GUI. Even the math itself is largely beyond my poor understanding. Such are my faults. In LabVIEW however, I am fairly comfortable. Thirteen years now, I have put LabVIEW to use in regular support of my job as a test engineer. So I find myself well able to at the very least faithfully instantiate example equations authored by others. So I here tip my hat to the three maestros cited above (my Aussie bush hat to Owen Duffy).