{"id":17806,"date":"2026-08-30T16:18:17","date_gmt":"2026-08-30T10:48:17","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=17806"},"modified":"2026-08-30T16:18:18","modified_gmt":"2026-08-30T10:48:18","slug":"running-lmr-sdr-1-1-from-powersdr-2-8-0-how-to-autocalibrate-frequency-using-ft-710-as-reference","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/running-lmr-sdr-1-1-from-powersdr-2-8-0-how-to-autocalibrate-frequency-using-ft-710-as-reference\/","title":{"rendered":"Running LMR SDR 1.1 from PowerSDR 2.8.0. How to autocalibrate frequency using FT-710 as reference?"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/rmgAYtLTQNo?si=4iBNglyk_gWmMGB_\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">To autocalibrate the LMR SDR 1.1 using your FT-710 as a reference, you will be using the FT-710 to generate a stable carrier signal that PowerSDR can measure and lock onto.<\/p>\n\n\n\n<p class=\"has-vivid-red-color has-text-color has-link-color wp-elements-1 wp-block-paragraph\"><strong>Critical SDR Safety<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Never connect the FT-710&#8217;s antenna output directly to the LMR SDR.<\/strong> Even at its minimum 5W setting, the FT-710 will instantly destroy the SDR&#8217;s Tayloe mixer (74HC4051) and RX circuitry. You must transmit the FT-710 into a dummy load and use a short wire on the LMR SDR to pick up the stray RF leakage.<\/p>\n\n\n\n<p class=\"has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-2 wp-block-paragraph\"><strong>1.Set Up the FT-710 Reference:<\/strong> Dummy load required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Connect the FT-710 to a dummy load. Set the frequency to a clean, known value (e.g., <code>7.150.000 MHz<\/code> or <code>10.000.000 MHz<\/code>). Set the mode to <strong>CW<\/strong> or <strong>AM<\/strong> and turn the RF power down to the minimum setting (5W) so you can transmit a steady, continuous carrier.<\/p>\n\n\n\n<p class=\"has-vivid-purple-color has-text-color has-link-color wp-elements-3 wp-block-paragraph\"><strong>2.Prepare the LMR SDR:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Attach a small piece of wire to the antenna input of the LMR SDR. Place it near the dummy load or FT-710 feedline. This will be enough to pick up the leakage RF signal safely. Power on the LMR SDR.<\/p>\n\n\n\n<p class=\"has-luminous-vivid-orange-color has-text-color has-link-color wp-elements-4 wp-block-paragraph\"><strong>3.Tune PowerSDR:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Launch PowerSDR 2.8.0 and click the <strong>Start<\/strong> button. Tune <strong>VFO A<\/strong> to the exact frequency you set on the FT-710. Briefly key the FT-710 to make sure you can see a strong, visible peak on the panadapter.<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-5 wp-block-paragraph\"><strong>4.Access the Calibration Menu:<\/strong>Setup.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">General&#8221;&gt;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the top menu, click <strong>Setup<\/strong>, navigate to the <strong>General<\/strong> tab, and then click on the <strong>Calibration<\/strong> sub-tab. Look for the <strong>Freq Cal<\/strong> section on the left side.<\/p>\n\n\n\n<p class=\"has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-6 wp-block-paragraph\"><strong>5.Run the Autocalibration:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Click the <strong>Use VFO-A<\/strong> button (or manually type the exact frequency into the box). Key the FT-710 to transmit a steady carrier. While the carrier is active and steady, click the <strong>Start<\/strong> button in the Freq Cal section.<\/p>\n\n\n\n<p class=\"has-vivid-purple-color has-text-color has-link-color wp-elements-7 wp-block-paragraph\"><strong>6.Apply the Offset:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PowerSDR will analyze the received signal, calculate the frequency offset of the Si5351 clock generator on the LMR SDR, and adjust the correction factor until the signal is perfectly centered. Once the process completes, unkey the FT-710, then click <strong>Apply<\/strong> and <strong>OK<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>To autocalibrate the LMR SDR 1.1 using your FT-710 as a reference, you will be using the FT-710 to generate a stable carrier signal that PowerSDR can measure and lock onto. Critical SDR Safety Never connect the FT-710&#8217;s antenna output directly to the LMR SDR. Even at its minimum 5W setting, the FT-710 will instantly [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17807,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-17806","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Running LMR SDR 1.1 from PowerSDR 2.8.0. 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