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Adding notes at the bottom.

pull/2/head
miguel 2020-11-19 19:57:03 +11:00
rodzic 8a2108c9f3
commit fbf402da2e
2 zmienionych plików z 51 dodań i 9 usunięć
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18
magloop.css
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@ -86,7 +86,7 @@ section div.antennaSide-container {
section.gridLayoutClass {
display: grid;
grid-template-columns: repeat(2, 1fr);
grid-template-rows: repeat(3, 1fr) 150px 120px;
grid-template-rows: repeat(3, 1fr) 150px 120px 300px;
justify-items: stretch;
}
@ -118,13 +118,20 @@ section div.antennaSide-container {
grid-row-start: 5;
grid-row-end: 6;
}
section div.notes {
grid-column-start: 1;
grid-column-end: 3;
grid-row-start: 6;
grid-row-end: 7;
}
}
@media (orientation: landscape) {
section.gridLayoutClass {
display: grid;
grid-template-columns: repeat(4, 1fr);
grid-template-rows: repeat(2, 1fr) 150px;
grid-template-rows: repeat(2, 1fr) 150px 300px;
justify-items: stretch;
}
@ -156,6 +163,13 @@ section div.antennaSide-container {
grid-row-start: 3;
grid-row-end: 4;
}
section div.notes {
grid-column-start: 1;
grid-column-end: 5;
grid-row-start: 4;
grid-row-end: 5;
}
}
/*
@media print (orientation: landscape) {

42
magloop.html
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@ -16,19 +16,19 @@
</div>
<div class="slider_container">
<div class="sliders">
<label for="loop_diameter_slider">&#8960a:</label>
<input type="range" id="loop_diameter_slider" min="0.2" max="5.0" value="1.0" step="0.05">
<label for="conductor_diameter_slider">&#8960a:</label>
<input type="range" id="conductor_diameter_slider" min="5" max="40" value="19" step="0.5">
</div>
<div class="sliders">
<label for="conductor_diameter_slider">&#8960b:</label>
<input type="range" id="conductor_diameter_slider" min="5" max="40" value="19" step="0.5">
<label for="loop_diameter_slider">&#8960b:</label>
<input type="range" id="loop_diameter_slider" min="0.2" max="5.0" value="1.0" step="0.05">
</div>
<div class="sliders">
<label for="loop_turns_slider">N:</label>
<input type="range" id="loop_turns_slider" min="1" max="8" value="1.0" step="1.0">
</div>
<div class="sliders">
<label for="loop_spacing_slider">c/b:</label>
<label for="loop_spacing_slider">c/a:</label>
<input type="range" id="loop_spacing_slider" min="1.1" max="4.0" value="2.0" step="0.01">
</div>
<div class="sliders">
@ -44,6 +44,34 @@
<canvas id="antennaSide2D" class="antennaSideClass" width="150" height="150">
</canvas>
</div>
<div class="notes">
<b><u>Notes:</u></b><br>
The Magloop Antenna Calculator was developed to predict the characteritics of a small-loop (aka "magloop")
antenna, given physical dimensions entered via slider widgets. There are many magloop calculators available
online. Some require installing a program on your computer, which is OS dependent. Some others are browser-based,
but require parameters to be input using a keyboard. I wanted to create a tool that took advantage of the
touch-screens and high-speed of modern mobile phones, to allow users to get realtime feedback of the predicted
behaviour of a magloop antenna. This would help a radio amateur to decide on the characteristics for the build.<br>
<u>Inputs via the slider widgets:</u>
<ul>
<li>&#8960a : Conductor diameter in millimeters (mm). Estimated equivalent AWG wire size is also displayed where appropriate.</li>
<li>&#8960b : Loop diameter in meters (m).</li>
<li>N : Number of turns or loops.</li>
<li>c/a : 'c' is the inter-winding spacing, and 'a' is the conductor diameter, so 'c/a' is the spacing ratio. (Must be >= 1.1)
A low-value will increase the resistance due to the proximity effect.</li>
<li>Tx : The transmit power. This affects the predicted voltage across the capacitor.</li>
</ul>
<u>Calculated parameters:</u>
<ul>
<li>L : Inductance is calculated using Nagaoka's equation. Value in microhenries.</li>
<li>C : Capacitance for multi-turn loops, which is calculated using Knight's 2016 paper on self-resonance and self-capacitance of solenoid coils.</li>
<li>c : Distance between windings, measured from the conductor centers (mm).</li>
<li>Tuning Cap (pF): The capacitance required to bring the loop into resonance at the given frequency. Value in picofarads.</li>
<li>Vcap (kV): The predicted voltage across the capacitance given the desired transmit power.</li>
<li>BW (kHz): The predicted 3dB bandwidth of the magloop antenna. This is calculated from the predicted Q and the center frequency.</li>
<li>Efficiency (%): Calculated from the radiation resistance divided by the sum of radiation resistance and the loss resistance.</li>
</ul>
</div>
</section>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-crosshair@1.1.2"></script>
@ -478,7 +506,7 @@
fctx.font = "12px arial";
fctx.textAlign = "center";
const dia = 1.0 * loop_diameter_slider.value;
fctx.fillText("\u2300a = " + dia.toPrecision(3).toString() + "m", loopx, loopy - 6);
fctx.fillText("\u2300b = " + dia.toPrecision(3).toString() + "m", loopx, loopy - 6);
// Draw conductor diameter arrow:
fctx.beginPath();
@ -515,7 +543,7 @@
p1y = loopy + 0.4 * (loop_radius - cond_radius) - 5;
//fctx.textAlign = "right";
const cond_dia = 1.0 * conductor_diameter_slider.value;
fctx.fillText("\u2300b = " + cond_dia.toPrecision(3).toString() + "mm", loopx, p1y+2);
fctx.fillText("\u2300a = " + cond_dia.toPrecision(3).toString() + "mm", loopx, p1y+2);
}
const aside_canvas = document.getElementById("antennaSide2D");