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Update short_antenna.html

pull/2/head
miguel 2023-03-21 23:26:16 +11:00
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commit 3a204e2ef9
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short_antenna.html
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@ -38,29 +38,13 @@
slider widgets. <br><br>
<u>Inputs via the slider widgets:</u>
<ul>
<li>f : The frequency of operation in MHz.</li>
<li>l : Length in percent compared to a half-wave dipole.</li>
<li>d : Distance of the coil/inductor from the feedpoint to the end, in percent.</li>
<li>AWG : Conductor diameter slider changes AWG from 0-40. Actual diameter displayed in decimal inches and millimeters.</li>
</ul>
<p>Characteristics on the left are independent of frequency, while the characteristics on the right are dependent on the selected frequency. <br><br>
Each of the graphic representations attempt to keep the relative geometry correct, without exceeding the drawing boundary. The coil diameter
relative to the conductor diameter are representative. </p>
<u>Calculated dimensions:</u>
<ul>
<li>&#8960;o : Outer coil diameter (inches) </li>
<li>&#8960;i : Inner coil diameter (inches) - corresponds to the diameter of the winding former.</li>
<li>c : Distance between windings, measured from the conductor centers (inches).</li>
<li>&#8467; : Length of the coil (inches). Equal to c x N.</li>
</ul>
<u>Calculated parameters:</u>
<ul> <b>Frequency independent:[L]</b>
<li>L : Inductance is calculated using Nagaoka's equation incorporating his coefficient.</li>
<li>C : Capacitance is calculated using Knight's 2016 paper on self-resonance and self-capacitance of solenoid coils.</li>
<li>Rdc : DC resistance is calculated using conductor length divided by the conductor cross-sectional area, assuming a copper conductor.</li>
<li>SRF : Self-resonant frequency (MHz) for the unloaded coil. </li>
<li>wire : Length of wire required to wind the inductor. </li>
<li>f : The frequency of operation in MHz. [1.8-57.6 MHz]</li>
<li>l : Length in percent compared to a half-wave dipole. [10-100 %]</li>
<li>d : Distance of the coil/inductor from the feedpoint to the end, in percent. [10-80 %]</li>
<li>AWG : Conductor diameter slider changes wire thickness in AWG. Actual diameter displayed in decimal inches and millimeters. [40-0 AWG]</li>
</ul>
<p>Top left is the length of a single antenna element. (Not including the coil length.) <br>
Top right is the length of the entire dipole. (Not including the coil length.)) </p>
</div>
</section>
<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjs/7.5.1/math.min.js"></script>
@ -320,6 +304,20 @@
ctx.stroke();
}
function getFeetAndInchesFromMeters(inMeters) {
//
var inFeet = Math.trunc(inMeters * 3.28084);
var inchesLeft = (inMeters - (inFeet / 3.28084)) * 39.37008;
return inFeet.toString() + inchesLeft.toFixed(2).toString();
}
function getFeetAndInchesFromFeet(inFeet) {
//
var wholeFeet = Math.trunc(inFeet);
var inches = (inFeet - wholeFeet) * 12.0;
return wholeFeet.toString() + "\' " + inches.toFixed(1).toString() + "\"";
}
const afront_canvas = document.getElementById("inductor2D");
const fctx = afront_canvas.getContext('2d');
@ -371,16 +369,20 @@
drawInductor(fctx, wire_x, d_pos, 0.0*Math.PI);
drawArrow(fctx, wire_x - 30, d_pos, 0.5*Math.PI);
fctx.fillText(dipole.distance_meters.toFixed(2).toString() + " m", wire_x - 60, d_pos + 12 );
fctx.fillText(dipole.distance_feet.toFixed(2).toString() + " ft", wire_x - 60, d_pos - 4);
//fctx.fillText(dipole.distance_feet.toFixed(2).toString() + " ft", wire_x - 60, d_pos - 4);
fctx.fillText(getFeetAndInchesFromFeet(dipole.distance_feet), wire_x - 60, d_pos - 4);
drawArrow(fctx, wire_x - 30, up_wire_bot_y, 0.5*Math.PI);
fctx.fillText("0.00", wire_x - 60, up_wire_bot_y + 5);
//fctx.fillText("0.00 m", wire_x - 60, up_wire_bot_y + 18);
drawArrow(fctx, wire_x - 30, up_wire_top_y, 0.5*Math.PI);
fctx.fillText((dipole.length_feet * 0.5).toFixed(2).toString() + " ft", wire_x - 60, up_wire_top_y - 4);
//fctx.fillText((dipole.length_feet * 0.5).toFixed(2).toString() + " ft", wire_x - 60, up_wire_top_y - 4);
fctx.fillText(getFeetAndInchesFromFeet(dipole.length_feet * 0.5), wire_x - 60, up_wire_top_y - 4);
fctx.fillText((dipole.length_meters * 0.5).toFixed(2).toString() + " m", wire_x - 60, up_wire_top_y + 12);
fctx.textAlign = "left";
fctx.fillText(dipole.length_feet.toFixed(2).toString() + " ft", wire_x + 60, up_wire_top_y - 4);
//fctx.fillText(dipole.length_feet.toFixed(2).toString() + " ft", wire_x + 60, up_wire_top_y - 4);
fctx.fillText(getFeetAndInchesFromFeet(dipole.length_feet), wire_x + 60, up_wire_top_y - 4);
fctx.fillText(dipole.length_meters.toFixed(2).toString() + " m", wire_x + 60, up_wire_top_y + 12);
//fctx.fillText("0.00 ft", wire_x + 60, down_wire_bot_y );
fctx.fillText("0.00", wire_x + 60, down_wire_bot_y + 5);