{"id":21,"date":"2025-12-11T02:56:23","date_gmt":"2025-12-11T02:56:23","guid":{"rendered":"https:\/\/telecom.grib.xyz\/?p=21"},"modified":"2025-12-11T06:13:02","modified_gmt":"2025-12-11T06:13:02","slug":"calculators","status":"publish","type":"post","link":"https:\/\/telecom.grib.xyz\/index.php\/2025\/12\/11\/calculators\/","title":{"rendered":"Calculators"},"content":{"rendered":"\n<div style=\"max-width: 400px; margin: auto; padding: 20px; border: 1px solid #ddd; border-radius: 10px; box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);\">\n    <h2>DBM to Watts Converter<\/h2>\n    <form id=\"dbm-form\">\n        <label for=\"dbm\">DBM:<\/label>\n        <input type=\"number\" id=\"dbm\" placeholder=\"Enter DBM value\" step=\"0.01\"><br><br>\n        <button type=\"button\" onclick=\"convertDbmToWatts()\">Convert to Watts<\/button> or\n        <button type=\"button\" onclick=\"convertWattsToDbm()\">Convert from Watts<\/button><br><br>\n        <label for=\"watts\">Watts:<\/label>\n        <input type=\"number\" id=\"watts-db\" placeholder=\"Result in Watts\" readonly><br><br>\n        <label for=\"dbm-result\">DBM Result:<\/label>\n        <input type=\"text\" id=\"dbm-result\" placeholder=\"Result in DBM\" readonly>\n    <\/form>\n\n    <h2>Frequency to Wavelength and Reverse<\/h2>\n    <form id=\"freq-form\">\n        <label for=\"frequency\">Frequency (MHz):<\/label>\n        <input type=\"number\" id=\"frequency\" placeholder=\"Enter Frequency\" step=\"0.01\"><br><br>\n        <button type=\"button\" onclick=\"convertFreqToWavelength()\">Convert to Wavelength<\/button> or\n        <button type=\"button\" onclick=\"convertWavelengthToFreq()\">Convert from Wavelength<\/button><br><br>\n        <label for=\"wavelength\">Wavelength (m):<\/label>\n        <input type=\"number\" id=\"wavelength\" placeholder=\"Result in Wavelength\" readonly><br><br>\n    <\/form>\n\n    <h2>Antenna Downtilt Angle Calculator<\/h2>\n    <form id=\"downtilt-form\">\n        <label for=\"distance\">Distance (m):<\/label>\n        <input type=\"number\" id=\"distance\" placeholder=\"Enter Distance\" step=\"0.01\"><br><br>\n        <label for=\"height\">Height (m):<\/label>\n        <input type=\"number\" id=\"height\" placeholder=\"Enter Height\" step=\"0.01\"><br><br>\n        <button type=\"button\" onclick=\"calculateDowntilt()\">Calculate Downtilt Angle<\/button>\n        <label for=\"downtilt-angle\">Downtilt Angle (\u00b0):<\/label>\n        <input type=\"text\" id=\"downtilt-angle\" placeholder=\"Result in Downtilt Angle\" readonly>\n    <\/form>\n\n    <h2>EIRP Calculator<\/h2>\n    <form id=\"eirp-form\">\n        <label for=\"dbm\">DBM:<\/label>\n        <input type=\"number\" id=\"eirp-db\" placeholder=\"Enter DBM value\" step=\"0.01\"><br><br>\n        <label for=\"antenna-gain\">Antenna Gain (dBi):<\/label>\n        <input type=\"number\" id=\"antenna-gain\" placeholder=\"Enter Antenna Gain\" step=\"0.01\"><br><br>\n        <button type=\"button\" onclick=\"calculateEIRP()\">Calculate EIRP<\/button>\n        <label for=\"eirp-result\">EIRP (dBm):<\/label>\n        <input type=\"text\" id=\"eirp-result\" placeholder=\"Result in EIRP\" readonly>\n    <\/form>\n\n    <h2>Free Space Loss Calculator<\/h2>\n    <form id=\"free-space-loss-form\">\n        <label for=\"wavelength\">Wavelength (m):<\/label>\n        <input type=\"number\" id=\"free-space-wavelength\" placeholder=\"Enter Wavelength\" step=\"0.01\"><br><br>\n        <label for=\"distance\">Distance (km):<\/label>\n        <input type=\"number\" id=\"free-space-distance\" placeholder=\"Enter Distance\" step=\"0.01\"><br><br>\n        <button type=\"button\" onclick=\"calculateFreeSpaceLoss()\">Calculate Free Space Loss<\/button>\n        <label for=\"fsl-result\">FSL (dB):<\/label>\n        <input type=\"text\" id=\"fsl-result\" placeholder=\"Result in FSL\" readonly>\n    <\/form>\n\n    <h2>Fresnel Zone Calculator<\/h2>\n    <form id=\"fresnel-zone-form\">\n        <label for=\"distance\">Distance (m):<\/label>\n        <input type=\"number\" id=\"fresnel-distance\" placeholder=\"Enter Distance\" step=\"0.01\"><br><br>\n        <button type=\"button\" onclick=\"calculateFresnelZone()\">Calculate Fresnel Zone<\/button>\n        <label for=\"fz-result\">Fresnel Zone (m):<\/label>\n        <input type=\"text\" id=\"fz-result\" placeholder=\"Result in Fresnel Zone\" readonly>\n    <\/form>\n\n    <h2>FRIIS Transmission Loss Calculator<\/h2>\n    <form id=\"fris-form\">\n        <label for=\"distance\">Distance (km):<\/label>\n        <input type=\"number\" id=\"fris-distance\" placeholder=\"Enter Distance\" step=\"0.01\"><br><br>\n        <button type=\"button\" onclick=\"calculateFris()\">Calculate FRIIS Transmission Loss<\/button>\n        <label for=\"fris-result\">FRIIS Transmission Loss (dB):<\/label>\n        <input type=\"text\" id=\"fris-result\" placeholder=\"Result in FRIIS Transmission Loss\" readonly>\n    <\/form>\n\n<script>\nfunction convertDbmToWatts() {\n    let dbm = parseFloat(document.getElementById(\"dbm\").value);\n    if (!isNaN(dbm)) {\n        let watts = 10 ** ((dbm + 30) \/ 10);\n        document.getElementById(\"watts-db\").value = watts.toFixed(2);\n        document.getElementById(\"dbm-result\").value = \"N\/A\";\n    } else {\n        alert(\"Please enter a valid DBM value.\");\n    }\n}\n\nfunction convertWattsToDbm() {\n    let watts = parseFloat(document.getElementById(\"dbm\").value); \/\/ Note: This should be the watts input, not dbm\n    if (!isNaN(watts)) {\n        let dbm = 10 * Math.log10(watts \/ (10 ** -3)); \/\/ Convert Watts to milliwatts first\n        document.getElementById(\"watts-db\").value = \"N\/A\";\n        document.getElementById(\"dbm-result\").value = dbm.toFixed(2);\n    } else {\n        alert(\"Please enter a valid Watts value.\");\n    }\n}\n\nfunction convertFreqToWavelength() {\n    let frequency = parseFloat(document.getElementById(\"frequency\").value);\n    if (!isNaN(frequency)) {\n        let wavelength = 300 \/ frequency;\n        document.getElementById(\"wavelength\").value = wavelength.toFixed(2);\n    } else {\n        alert(\"Please enter a valid Frequency value.\");\n    }\n}\n\nfunction convertWavelengthToFreq() {\n    let wavelength = parseFloat(document.getElementById(\"frequency\").value); \/\/ Note: This should be the wavelength input, not freq\n    if (!isNaN(wavelength)) {\n        let frequency = 300 \/ wavelength;\n        document.getElementById(\"wavelength\").value = \"N\/A\";\n        document.getElementById(\"frequency\").value = frequency.toFixed(2);\n    } else {\n        alert(\"Please enter a valid Wavelength value.\");\n    }\n}\n\nfunction calculateDowntilt() {\n    let distance = parseFloat(document.getElementById(\"distance\").value);\n    let height = parseFloat(document.getElementById(\"height\").value);\n    if (!isNaN(distance) && !isNaN(height)) {\n        let downtilt = 57.3 * Math.atan2(1, (distance \/ (2 * height)));\n        document.getElementById(\"downtilt-angle\").value = downtilt.toFixed(2) + \"\u00b0\";\n    } else {\n        alert(\"Please enter valid Distance and Height values.\");\n    }\n}\n\nfunction calculateEIRP() {\n    let dbm = parseFloat(document.getElementById(\"eirp-db\").value);\n    let antennaGain = parseFloat(document.getElementById(\"antenna-gain\").value);\n    if (!isNaN(dbm) && !isNaN(antennaGain)) {\n        let eirp = (dbm + 10 * Math.log10(antennaGain));\n        document.getElementById(\"eirp-result\").value = eirp.toFixed(2);\n    } else {\n        alert(\"Please enter valid DBM and Antenna Gain values.\");\n    }\n}\n\nfunction calculateFreeSpaceLoss() {\n    let wavelength = parseFloat(document.getElementById(\"free-space-wavelength\").value);\n    let distance = parseFloat(document.getElementById(\"free-space-distance\").value) \/ 1000; \/\/ Convert km to m\n    if (!isNaN(wavelength) && !isNaN(distance)) {\n        let fsl = 20 * Math.log10(4 * Math.PI * (distance \/ wavelength));\n        document.getElementById(\"fsl-result\").value = fsl.toFixed(2);\n    } else {\n        alert(\"Please enter valid Wavelength and Distance values.\");\n    }\n}\n\nfunction calculateFresnelZone() {\n    let distance = parseFloat(document.getElementById(\"fresnel-distance\").value);\n    if (!isNaN(distance)) {\n        let fz = Math.sqrt((distance ** 4) \/ (4 * (1 + (0.21 * (distance ** 2))));\n        document.getElementById(\"fz-result\").value = fz.toFixed(2);\n    } else {\n        alert(\"Please enter a valid Distance value.\");\n    }\n}\n\nfunction calculateFris() {\n    let distance = parseFloat(document.getElementById(\"fris-distance\").value) \/ 1000; \/\/ Convert km to m\n    if (!isNaN(distance)) {\n        let frisLoss = (92.4 + 20 * Math.log10(4 * Math.PI * (distance ** 2))) - 20 * Math.log10(1);\n        document.getElementById(\"fris-result\").value = frisLoss.toFixed(2);\n    } else {\n        alert(\"Please enter a valid Distance value.\");\n    }\n}\n<\/script>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>DBM to Watts Converter<br \/>\n\u200bFrequency to Wavelength<br \/>\n\u200bAntenna Downtilt Angle Calculator<br \/>\n\u200bEIRP Calculator<br \/>\n\u200bFree Space Loss Calculator<br \/>\n\u200bFresnel Zone Calculator<br \/>\n\u200bFRIIS Transmission Loss Calculator<\/p>\n","protected":false},"author":1,"featured_media":25,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-21","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Calculators - Telecom - 4G-5G-6G and beyond<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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