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<b><u>Notes:</u></b><br>
The VK3CPU RF Transformer Calculator was developed to help users predict the RF characteristics of a ferrite toroid wound as a transformer.
It uses the manufacturer's (Fair-Rite) published data including the toroid's dimensions and complex permeability characteristics
to predict the component's characteristics.<br>
to predict the transformer's characteristics.<br>
The calculator has 3 separate display areas. At the top is the chart display for showing frequency-dependent characteristics. Next is the
schematic display, where a scaled image of the toroid and windings is presented to help with intuitive design. Next is the control panel
section, where the user can select the application type, toroid material, toroid size, wire size, number of windings and excitation voltage.<br><br>
section, where the user can select the wire size, toroid material, toroid size, number of primary and secondary windings, input power and load impedance.<br><br>
<b><u>Inputs via the select widgets:</u></b>
<ul>
<li>Application : Selects the intended use of the toroid, either Inductor or Suppressor is currently supported. This limits the material selection as appropriate.</li>
<li>Size : Selects the size of the toroid. FT240 is 2.4" in diameter. FT80 is 0.8", etc...</li>
<li>Material : Manufacturers material mix code. Inductor mode shows initial permeability [&#956;i] in square brackets. (Pick lower &#956;i for higher frequency applications.)
Suppressor mode displays effective suppression frequency range in square brackets.</li>
<li>Material : Manufacturers material mix code. Select this first. Initial permeability [&#956;i] is displayed in square brackets. (Pick lower &#956;i for higher frequency applications.) </li>
</ul>
<b><u>Inputs via the slider widgets:</u></b>
<ul>
<li>AWG : Select the wire gauge. Sliding L-R changes AWG from 40-0. (Defaults to 20 AWG)</li>
<li>N : Winding density at the toroid inner-diameter. Controls how many single-layer turns can be achieved around the core.
Maximum (100%, slider to hard-right) is reached when the turns are adjacent at the toroid's inner radius. (Defaults to 15%)</li>
<li>Vrms : The RMS voltage applied to the inductor (Volts). Determines the flux-density (B) and field-intensity (H) within the ferrite toroid. (Defaults to 10Vrms)</li>
<li>f : Shifts the frequency of interest of the chart display from left-to-right. Left towards kHz, right towards GHz. </li>
<li>Np : Number of turns for the primary Winding. (Defaults to 20 turns.)</li>
<li>Ns : Number of turns for the secondary Winding. (Defaults to 20 turns.) </li>
<li>P : The input power in watts. (Defaults to 100 W)</li>
<li>Zl : Load impedance in ohms. (Defaults to 50 ohms.) </li>
</ul>
<i>Note: Manufacturers recommend keeping the number of turns (N) to a minimum.</i><br><br>
<b><u>Chart display:</u></b>