Add antenna conversion tab

public/astronomical_conversions.php

@@ -246,6 +246,7 @@ $toolDefaultLocalDateTime = (new DateTimeImmutable('now', new DateTimeZone($tool
         <button type="button" class="astro-conv-tab" data-tab-target="timeTab" role="tab" aria-selected="false">Zeit</button>
         <button type="button" class="astro-conv-tab" data-tab-target="coordinatesTab" role="tab" aria-selected="false">Koordinaten</button>
         <button type="button" class="astro-conv-tab" data-tab-target="angleTab" role="tab" aria-selected="false">Winkel</button>
+        <button type="button" class="astro-conv-tab" data-tab-target="antennaTab" role="tab" aria-selected="false">Antennen</button>
         <button type="button" class="astro-conv-tab" data-tab-target="toolsTab" role="tab" aria-selected="false">Diverse Tools</button>
     </div>
 
@@ -517,6 +518,49 @@ $toolDefaultLocalDateTime = (new DateTimeImmutable('now', new DateTimeZone($tool
         </div>
     </section>
 
+    <section class="card astro-conv-panel astro-conv-tab-panel" id="antennaTab" role="tabpanel">
+        <h2>Antennen-Umrechner</h2>
+        <p>Frequenz und Wellenlaenge ineinander umrechnen sowie Richtwerte fuer einen Halbwellendipol berechnen.</p>
+
+        <div class="astro-conv-grid" id="antennaConverter">
+            <div class="astro-conv-field">
+                <label for="antennaFrequencyMhz">Frequenz (MHz)</label>
+                <input class="astro-conv-input" id="antennaFrequencyMhz" type="text" inputmode="decimal" value="145">
+            </div>
+
+            <div class="astro-conv-field">
+                <label for="antennaWavelengthM">Wellenlaenge (m)</label>
+                <input class="astro-conv-input" id="antennaWavelengthM" type="text" inputmode="decimal">
+            </div>
+
+            <div class="astro-conv-field">
+                <label for="antennaWavelengthCm">Wellenlaenge (cm)</label>
+                <input class="astro-conv-input" id="antennaWavelengthCm" type="text" readonly>
+            </div>
+
+            <div class="astro-conv-field">
+                <label for="antennaHalfwaveTotalM"><span class="astro-conv-label-help" title="Theoretische Gesamtlaenge eines Halbwellendipols: Lambda / 2.">Dipol gesamt theoretisch (m)</span></label>
+                <input class="astro-conv-input" id="antennaHalfwaveTotalM" type="text" readonly>
+            </div>
+
+            <div class="astro-conv-field">
+                <label for="antennaHalfwavePracticalM"><span class="astro-conv-label-help" title="Praxisnaher Richtwert mit Verkuerzungsfaktor 0,95 fuer einen einfachen Drahtdipol.">Dipol gesamt praktisch (m)</span></label>
+                <input class="astro-conv-input" id="antennaHalfwavePracticalM" type="text" readonly>
+            </div>
+
+            <div class="astro-conv-field">
+                <label for="antennaLegLengthM"><span class="astro-conv-label-help" title="Laenge eines einzelnen Dipol-Schenkels. Praktischer Richtwert: Lambda x 0,95 / 4.">Ein Schenkel (m)</span></label>
+                <input class="astro-conv-input" id="antennaLegLengthM" type="text" readonly>
+            </div>
+        </div>
+
+        <div class="astro-conv-actions">
+            <button type="button" class="btn btn-secondary" id="antennaClear">Leeren</button>
+            <button type="button" class="btn btn-primary" id="antenna2m">2-m-Band</button>
+            <button type="button" class="btn btn-primary" id="antennaCb">CB-Funk</button>
+        </div>
+    </section>
+
     <section class="card astro-conv-panel astro-conv-tab-panel" id="toolsTab" role="tabpanel">
         <h2>Diverse Tools</h2>
         <p>Sonnenstand für den Standard-Standort aus dem Header berechnen. Datum und Uhrzeit werden in der lokalen Zeitzone des Standorts interpretiert.</p>
@@ -647,6 +691,14 @@ $toolDefaultLocalDateTime = (new DateTimeImmutable('now', new DateTimeZone($tool
         arcsec: document.getElementById('angleArcsec'),
         rad: document.getElementById('angleRad')
     };
+    const antennaFields = {
+        frequencyMhz: document.getElementById('antennaFrequencyMhz'),
+        wavelengthM: document.getElementById('antennaWavelengthM'),
+        wavelengthCm: document.getElementById('antennaWavelengthCm'),
+        halfwaveTotalM: document.getElementById('antennaHalfwaveTotalM'),
+        halfwavePracticalM: document.getElementById('antennaHalfwavePracticalM'),
+        legLengthM: document.getElementById('antennaLegLengthM')
+    };
     const toolFields = {
         dateTimeLocal: document.getElementById('toolsDateTimeLocal'),
         locationName: document.getElementById('toolsLocationName'),
@@ -664,6 +716,7 @@ $toolDefaultLocalDateTime = (new DateTimeImmutable('now', new DateTimeZone($tool
     let timeRequestId = 0;
     let coordinateRequestId = 0;
     let angleRequestId = 0;
+    let antennaRequestId = 0;
     let toolRequestId = 0;
 
     const DECIMAL_DIVISION_PRECISION = 32;
@@ -1088,6 +1141,12 @@ $toolDefaultLocalDateTime = (new DateTimeImmutable('now', new DateTimeZone($tool
         wireTooltipHover(field);
     });
 
+    const antennaFieldEntries = Object.entries(antennaFields);
+    antennaFieldEntries.forEach(function ([unit, field]) {
+        attachTooltip(field, 'antenna-' + unit);
+        wireTooltipHover(field);
+    });
+
     const updateDistanceFrom = async function (sourceUnit) {
         const rawValue = distanceFields[sourceUnit].value.trim();
         if (rawValue === '') {
@@ -1661,6 +1720,98 @@ $toolDefaultLocalDateTime = (new DateTimeImmutable('now', new DateTimeZone($tool
         updateAngleFrom('arcsec');
     });
 
+    const formatNumber = function (value, maxFractionDigits) {
+        if (!Number.isFinite(value)) {
+            return '';
+        }
+
+        return value.toLocaleString('de-DE', {
+            maximumFractionDigits: maxFractionDigits,
+            useGrouping: true
+        });
+    };
+
+    const clearAntennaOutputs = function () {
+        ['wavelengthCm', 'halfwaveTotalM', 'halfwavePracticalM', 'legLengthM'].forEach(function (key) {
+            antennaFields[key].value = '';
+            updateTooltip(antennaFields[key]);
+        });
+    };
+
+    const updateAntennaFrom = function (sourceUnit) {
+        const sourceField = antennaFields[sourceUnit];
+        if (!sourceField) {
+            return;
+        }
+
+        const rawValue = sourceField.value.trim();
+        if (rawValue === '') {
+            Object.entries(antennaFields).forEach(function ([key, field]) {
+                if (key !== sourceUnit) {
+                    field.value = '';
+                    updateTooltip(field);
+                }
+            });
+            return;
+        }
+
+        const parsedValue = parseDecimalInput(rawValue);
+        const numericValue = parsedValue ? decimalToNumber(parsedValue) : Number.NaN;
+        if (!Number.isFinite(numericValue) || numericValue <= 0) {
+            clearAntennaOutputs();
+            return;
+        }
+
+        const requestId = ++antennaRequestId;
+        const wavelengthMeters = sourceUnit === 'frequencyMhz'
+            ? 299.792458 / numericValue
+            : numericValue;
+        const frequencyMhz = sourceUnit === 'wavelengthM'
+            ? 299.792458 / numericValue
+            : numericValue;
+
+        if (requestId !== antennaRequestId || !Number.isFinite(wavelengthMeters) || wavelengthMeters <= 0) {
+            clearAntennaOutputs();
+            return;
+        }
+
+        const practicalFactor = 0.95;
+        antennaFields.frequencyMhz.value = formatNumber(frequencyMhz, 6);
+        antennaFields.wavelengthM.value = formatNumber(wavelengthMeters, 6);
+        antennaFields.wavelengthCm.value = formatNumber(wavelengthMeters * 100, 2);
+        antennaFields.halfwaveTotalM.value = formatNumber(wavelengthMeters / 2, 4);
+        antennaFields.halfwavePracticalM.value = formatNumber((wavelengthMeters / 2) * practicalFactor, 4);
+        antennaFields.legLengthM.value = formatNumber((wavelengthMeters / 4) * practicalFactor, 4);
+
+        Object.values(antennaFields).forEach(function (field) {
+            updateTooltip(field);
+        });
+    };
+
+    ['frequencyMhz', 'wavelengthM'].forEach(function (key) {
+        antennaFields[key].addEventListener('input', function () {
+            updateAntennaFrom(key);
+        });
+    });
+
+    document.getElementById('antennaClear').addEventListener('click', function () {
+        Object.values(antennaFields).forEach(function (field) {
+            field.value = '';
+            updateTooltip(field);
+        });
+        antennaFields.frequencyMhz.focus();
+    });
+
+    document.getElementById('antenna2m').addEventListener('click', function () {
+        antennaFields.frequencyMhz.value = '145';
+        updateAntennaFrom('frequencyMhz');
+    });
+
+    document.getElementById('antennaCb').addEventListener('click', function () {
+        antennaFields.frequencyMhz.value = '27,2';
+        updateAntennaFrom('frequencyMhz');
+    });
+
     const clearToolOutputs = function () {
         toolFields.dateTimeUtc.value = '';
         toolFields.altitude.value = '';
@@ -1752,6 +1903,7 @@ $toolDefaultLocalDateTime = (new DateTimeImmutable('now', new DateTimeZone($tool
     updateTimeFrom('utc');
     updateCoordinatesFrom('equatorial');
     updateAngleFrom('deg');
+    updateAntennaFrom('frequencyMhz');
     updateSolarTool();
 })();
 </script>