-
+
-
-
+
+
-
+
@@ -125,8 +125,8 @@
}
// Define global storage for calculated values, so we don't recalculate the same things multiple times:
- var inductor = {
- loop_diameter_meters : 0.0,
+ var dipole = {
+ length_meters : 0.0,
cond_diameter_meters : 0.0,
spacing_ratio : 0.0,
loop_turns : 0.0,
@@ -148,27 +148,18 @@
// Solve all the parameters, and re-draw the canvas:
function recalculate() {
// Input variables:
- inductor.loop_diameter_meters = 0.001 * antenna_length_slider.value * 25.4; // Inches to mm then to m
- inductor.cond_diameter_meters = 0.001 * awgToMm(40.0 - conductor_diameter_slider.value);
- inductor.spacing_ratio = 1.0 * inductor_distance.value;
- //inductor.loop_turns = 1.0 * loop_turns_slider.value;
- inductor.frequency_hz = 1e6 * frequency_slider.value;
+ //dipole.length_meters = 0.001 * antenna_length_slider.value * 25.4; // Inches to mm then to m
+ dipole.frequency_hz = 1.8e6 * (2 ** frequency_slider.value);
+ dipole.length_meters = 299792458.0 * 0.95 * antenna_length_slider.value / (2.0 * dipole.frequency_hz); //
+ dipole.length_feet = dipole.length_meters * 3.28084;
+ dipole.cond_diameter_meters = 0.001 * awgToMm(40.0 - conductor_diameter_slider.value);
+ dipole.cond_diameter_inches = dipole.cond_diameter_meters * 39.37008;
+ dipole.spacing_ratio = 0.01 * inductor_distance.value;
+ dipole.distance_meters = inductor_distance.value * 0.005 * dipole.length_meters;
+ dipole.distance_feet = dipole.distance_meters * 3.28084;
+
// Frequency independent characteristics:
- inductor.L = getInductance(inductor.loop_diameter_meters, inductor.cond_diameter_meters, inductor.spacing_ratio, inductor.loop_turns);
- inductor.C = multiloopCapacitance(inductor.loop_diameter_meters, inductor.cond_diameter_meters, inductor.spacing_ratio, inductor.loop_turns);
- inductor.Rdc = dcResistance(inductor.loop_diameter_meters, inductor.cond_diameter_meters, inductor.spacing_ratio, inductor.loop_turns);
- inductor.SRF = selfResonantFrequency(inductor.L, inductor.C);
- // Frequency dependent characteristics:
- inductor.Xl = inductiveReactance(inductor.frequency_hz, inductor.L);
- inductor.Xc = capacitiveReactance(inductor.frequency_hz, inductor.C);
- inductor.skin_depth = skinDepth(inductor.frequency_hz);
- inductor.Rac = acResistance(inductor.loop_diameter_meters, inductor.cond_diameter_meters, inductor.spacing_ratio, inductor.loop_turns, inductor.frequency_hz);
- //inductor.Q = qualityFactor(inductor.Xl, inductor.Rac);
- // Calculate impedance:
- var Zl = math.complex(inductor.Rac, inductor.Xl);
- var Zc = math.complex(0, inductor.Xc);
- inductor.Z = math.divide(math.multiply(Zl, Zc), math.add(Zl, Zc));
- inductor.Q = Math.abs(inductor.Z.im) / inductor.Z.re;
+ dipole.L = 0.0;
// Redraw the canvas:
//drawDesign();
}
@@ -290,7 +281,7 @@
// A = total antenna length in feet
// B = distance from antenna center to loading coil in feet
// D = diameter of the radiator in inches
- console.log(f, A, B, D);
+ //console.log(f, A, B, D);
const t1 = Math.log((24*((234/f) - B))/D) - 1;
const t2 = (1 - (f*B)/234)**2 - 1;
const t3 = Math.log((24*(A/2 -B))/D) - 1;
@@ -336,14 +327,10 @@
afront_canvas.height = win_height-12;
fctx.clearRect(0, 0, win_width, win_height);
- const loop_radius = 0.11 * win_height;
- var cond_radius = loop_radius * (inductor.cond_diameter_meters / inductor.loop_diameter_meters);
const loopx = win_width/2;
const loopy = win_height/4;
- const loop_diameter_mm = inductor.loop_diameter_meters * 1000.0;
- const cond_diameter_mm = inductor.cond_diameter_meters * 1000.0;
- const loop_diameter_inches = loop_diameter_mm / 25.4;
+ const cond_diameter_mm = dipole.cond_diameter_meters * 1000.0;
const cond_diameter_inches = cond_diameter_mm / 25.4;
fctx.font = "bold 14px arial";
@@ -359,17 +346,13 @@
const down_wire_top_y = win_height * 0.5 + 5;
const down_wire_bot_y = win_height * 0.9;
- // Draw loop diameter arrow:
- const y_offset = loopy + loop_radius + 20;
var arrow_size = 10.0;
- const inductorDistanceInMeters = inductor_distance.value * 0.005 * antenna_length_slider.value;
- const Xl = getInductanceFromDimensions(inductor.frequency_hz * 1e-6,
- antenna_length_slider.value * 3.3,
- inductorDistanceInMeters * 3.3,
- inductor.cond_diameter_meters * 39.37//
- );
- console.log(Xl);
+ const Xl = getInductanceFromDimensions(dipole.frequency_hz * 1e-6,
+ dipole.length_feet,
+ dipole.distance_feet,
+ dipole.cond_diameter_inches);
+ //console.log(Xl);
// Draw the top antenna element:
fctx.beginPath();
@@ -379,22 +362,30 @@
fctx.stroke();
fctx.textAlign = "right";
- drawInductor(fctx, wire_x, up_wire_bot_y - inductor.spacing_ratio * 0.01 * (up_wire_bot_y - up_wire_top_y), 0.0*Math.PI);
- drawArrow(fctx, wire_x - 30, up_wire_bot_y - inductor.spacing_ratio * 0.01 * (up_wire_bot_y - up_wire_top_y), 0.5*Math.PI);
- fctx.fillText(inductorDistanceInMeters.toFixed(2).toString() + " m", wire_x - 60, up_wire_bot_y - inductor.spacing_ratio * 0.01 * (up_wire_bot_y - up_wire_top_y) );
+ drawInductor(fctx, wire_x, up_wire_bot_y - dipole.spacing_ratio * (up_wire_bot_y - up_wire_top_y), 0.0*Math.PI);
+ drawArrow(fctx, wire_x - 30, up_wire_bot_y - dipole.spacing_ratio * (up_wire_bot_y - up_wire_top_y), 0.5*Math.PI);
+ fctx.fillText(dipole.distance_meters.toFixed(2).toString() + " m", wire_x - 60, up_wire_bot_y - dipole.spacing_ratio * (up_wire_bot_y - up_wire_top_y) + 18 );
+ fctx.fillText(dipole.distance_feet.toFixed(2).toString() + " ft", wire_x - 60, up_wire_bot_y - dipole.spacing_ratio * (up_wire_bot_y - up_wire_top_y) );
drawArrow(fctx, wire_x - 30, up_wire_bot_y, 0.5*Math.PI);
- fctx.fillText("0.00 m", wire_x - 60, up_wire_bot_y );
+ fctx.fillText("0.00 ft", wire_x - 60, up_wire_bot_y );
+ 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((antenna_length_slider.value * 0.5).toFixed(2).toString() + " m", wire_x - 60, up_wire_top_y );
+ fctx.fillText((dipole.length_feet * 0.5).toFixed(2).toString() + " ft", wire_x - 60, up_wire_top_y );
+ fctx.fillText((dipole.length_meters * 0.5).toFixed(2).toString() + " m", wire_x - 60, up_wire_top_y + 18);
fctx.textAlign = "left";
- fctx.fillText("l = " + (antenna_length_slider.value * 1.0).toFixed(1).toString() + " m", wire_x + 40, up_wire_top_y );
- fctx.fillText("f = " + (frequency_slider.value * 1.0).toFixed(1).toString() + " MHz", wire_x + 40, up_wire_top_y + 18 );
+ fctx.fillText(dipole.length_feet.toFixed(2).toString() + " ft", wire_x + 60, up_wire_top_y );
+ fctx.fillText(dipole.length_meters.toFixed(2).toString() + " m", wire_x + 60, up_wire_top_y + 18);
+ fctx.fillText("0.00 ft", wire_x + 60, down_wire_bot_y );
+ fctx.fillText("0.00 m", wire_x + 60, down_wire_bot_y + 18);
//drawArrow(fctx, wire_x + 10, up_wire_bot_y, -0.5*Math.PI);
- const L = Xl / (2 * Math.PI * inductor.frequency_hz * 0.000001);
- fctx.fillText("L = " + L.toFixed(1).toString() + " \u00B5H", wire_x + 20, up_wire_bot_y - inductor.spacing_ratio * 0.01 * (up_wire_bot_y - up_wire_top_y));
- fctx.fillText("Xl = " + Xl.toFixed(1).toString() + " \u03A9", wire_x + 20, up_wire_bot_y - inductor.spacing_ratio * 0.01 * (up_wire_bot_y - up_wire_top_y) + 18);
+ const L = Xl / (2 * Math.PI * dipole.frequency_hz * 0.000001);
+ fctx.fillText("L = " + L.toFixed(1).toString() + " \u00B5H", wire_x + 20, up_wire_bot_y - dipole.spacing_ratio * (up_wire_bot_y - up_wire_top_y));
+ fctx.fillText("Xl = " + Xl.toFixed(1).toString() + " \u03A9", wire_x + 20, up_wire_bot_y - dipole.spacing_ratio * (up_wire_bot_y - up_wire_top_y) + 18);
+ fctx.textAlign = "center";
+ fctx.fillText("f = " + (dipole.frequency_hz * 1e-6).toFixed(2).toString() + " MHz", wire_x, down_wire_bot_y + 30);
+
// Draw the bottom antenna element:
fctx.beginPath();
fctx.moveTo(wire_x - 15, down_wire_top_y);
@@ -402,9 +393,10 @@
fctx.lineTo(wire_x, down_wire_bot_y);
fctx.stroke();
- drawInductor(fctx, wire_x, down_wire_top_y + inductor.spacing_ratio * 0.01 * (up_wire_bot_y - up_wire_top_y), 0.0*Math.PI);
+ drawInductor(fctx, wire_x, down_wire_top_y + dipole.spacing_ratio * (up_wire_bot_y - up_wire_top_y), 0.0*Math.PI);
//drawArrow(fctx, wire_x + 10, down_wire_top_y, -0.5*Math.PI);
- //drawArrow(fctx, wire_x + 10, down_wire_bot_y, -0.5*Math.PI);
+ drawArrow(fctx, wire_x + 30, down_wire_bot_y, -0.5*Math.PI);
+ drawArrow(fctx, wire_x + 30, up_wire_top_y, -0.5*Math.PI);
}
recalculate();