https://rfcorner.in/tags/hs-100b/Recent content in HS-100B on Dhiru's NotebookHugoenSat, 17 Jan 2026 00:00:00 +0000https://rfcorner.in/posts/aprs-interface/Sat, 17 Jan 2026 00:00:00 +0000https://rfcorner.in/posts/aprs-interface/<h2 id="design">Design</h2> <p>Here is a "safe" APRS interface for BaoFeng and other radios.</p> <p>Sample schematic:</p> <div class="embed-pdf-container" id="embed-pdf-container-7475f967"> <div class="pdf-loadingWrapper" id="pdf-loadingWrapper-7475f967"> <div class="pdf-loading" id="pdf-loading-7475f967"></div> </div> <div id="overlayText"> <a href="https://rfcorner.in/pdfs/TheDigitalInterface-2026.pdf" aria-label="Download" download> <svg aria-hidden="true" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 18 18"> <path d="M9 13c.3 0 .5-.1.7-.3L15.4 7 14 5.6l-4 4V1H8v8.6l-4-4L2.6 7l5.7 5.7c.2.2.4.3.7.3zm-7 2h14v2H2z" /> </svg> </a> </div> <canvas class="pdf-canvas" id="pdf-canvas-7475f967"></canvas> </div> <div class="pdf-paginator" id="pdf-paginator-7475f967"> <button id="pdf-prev-7475f967">Previous</button> <button id="pdf-next-7475f967">Next</button> &nbsp; &nbsp; <span> <span class="pdf-pagenum" id="pdf-pagenum-7475f967"></span> / <span class="pdf-pagecount" id="pdf-pagecount-7475f967"></span> </span> <a class="pdf-source" id="pdf-source-7475f967" href="https://rfcorner.in/pdfs/TheDigitalInterface-2026.pdf">[pdf]</a> </div> <noscript> View the PDF file <a class="pdf-source" id="pdf-source-noscript-7475f967" href="https://rfcorner.in/pdfs/TheDigitalInterface-2026.pdf">here</a>. </noscript> <script type="text/javascript"> (function(){ var url = '\/pdfs\/TheDigitalInterface-2026.pdf'; var hidePaginator = "" === "true"; var hideLoader = "true" === "true"; var selectedPageNum = parseInt("") || 1; var pdfjsLib = window['pdfjs-dist/build/pdf']; if (pdfjsLib.GlobalWorkerOptions.workerSrc == '') pdfjsLib.GlobalWorkerOptions.workerSrc = "https:\/\/rfcorner.in\/" + 'js/pdf-js/build/pdf.worker.js'; var pdfDoc = null, pageNum = selectedPageNum, pageRendering = false, pageNumPending = null, scale = 3, canvas = document.getElementById('pdf-canvas-7475f967'), ctx = canvas.getContext('2d'), paginator = document.getElementById("pdf-paginator-7475f967"), loadingWrapper = document.getElementById('pdf-loadingWrapper-7475f967'); showPaginator(); showLoader(); function renderPage(num) { pageRendering = true; pdfDoc.getPage(num).then(function(page) { var viewport = page.getViewport({scale: scale}); canvas.height = viewport.height; canvas.width = viewport.width; var renderContext = { canvasContext: ctx, viewport: viewport }; var renderTask = page.render(renderContext); renderTask.promise.then(function() { pageRendering = false; showContent(); if (pageNumPending !== null) { renderPage(pageNumPending); pageNumPending = null; } }); }); document.getElementById('pdf-pagenum-7475f967').textContent = num; } function showContent() { loadingWrapper.style.display = 'none'; canvas.style.display = 'block'; } function showLoader() { if(hideLoader) return loadingWrapper.style.display = 'flex'; canvas.style.display = 'none'; } function showPaginator() { if(hidePaginator) return paginator.style.display = 'block'; } function queueRenderPage(num) { if (pageRendering) { pageNumPending = num; } else { renderPage(num); } } function onPrevPage() { if (pageNum <= 1) { return; } pageNum--; queueRenderPage(pageNum); } document.getElementById('pdf-prev-7475f967').addEventListener('click', onPrevPage); function onNextPage() { if (pageNum >= pdfDoc.numPages) { return; } pageNum++; queueRenderPage(pageNum); } document.getElementById('pdf-next-7475f967').addEventListener('click', onNextPage); pdfjsLib.getDocument(url).promise.then(function(pdfDoc_) { pdfDoc = pdfDoc_; var numPages = pdfDoc.numPages; document.getElementById('pdf-pagecount-7475f967').textContent = numPages; if(pageNum > numPages) { pageNum = numPages } renderPage(pageNum); }); })(); </script> <h2 id="render">Render</h2> <p><img alt="TheDigitalInterface-2026" loading="lazy" src="https://rfcorner.in/images/TheDigitalInterface-2026.png"></p>