{"id":904,"date":"2022-02-14T14:44:02","date_gmt":"2022-02-14T13:44:02","guid":{"rendered":"https:\/\/www.sp3yor.net\/?p=904"},"modified":"2024-01-06T21:18:40","modified_gmt":"2024-01-06T20:18:40","slug":"plutosdr-nagrywanie-szerokopasmowe-wideband-recording","status":"publish","type":"post","link":"https:\/\/www.sp3yor.net\/?p=904","title":{"rendered":"PlutoSDR &#8211; nagrywanie szerokopasmowe (wideband recording)"},"content":{"rendered":"\n<p>English below.<\/p>\n\n\n\n<p>Jak powszechnie wiadomo, g\u0142\u00f3wnym czynnikiem ograniczaj\u0105cym szerkopasmowo\u015b\u0107 PlutoSDR jest przepustowo\u015b\u0107 portu USB, pozwalaj\u0105ca na korzystanie z samplowania maksymalnie 4 MSPS. <\/p>\n\n\n\n<p>Ustawiaj\u0105c wy\u017csze samplowanie, na przyk\u0142ad 20 MSPS, 80% sampli zostanie zgubione, ale uzyskane w taki spos\u00f3b spektrum (FFT) sygna\u0142u jest jak najbardziej u\u017cyteczne &#8211; pozwala w spos\u00f3b wizualny przeanalizowa\u0107 parametry odbieranych sygna\u0142\u00f3w. Nieci\u0105g\u0142o\u015bci fazy wywo\u0142ane utrat\u0105 sampli generuj\u0105 szerokopasmowe zak\u0142\u00f3cenia, podobnie jak &#8222;kliksy&#8221; w telegrafii, co negatywnie wp\u0142ywa na dynamik\u0119 i podnosi t\u0142o szumowe.<\/p>\n\n\n\n<p>Pami\u0119\u0107 PlutoSDR mo\u017ce by\u0107 wykorzystana jako bufor na sample, co pozwala nagra\u0107 kr\u00f3tki fragment spektrum radiowego z wysokim samplowaniem, po czym pobra\u0107 go na komputer. Kod &#8211; poni\u017cej.<\/p>\n\n\n\n<p>Maximum usable sampling rate of PlutoSDR is effectively limited by it&#8217;s USB 2.0 port, up to 4 MSPS.<\/p>\n\n\n\n<p>Higher sampling rates can be set, but everything above ~4 MSPS will result in dropped samples. Shame, but the chopped RF stream still is kind of useful &#8211; its FFT can be used to visually inspect some interesting signals. Phase discontinuities will obviously result in broadband noise, similar to keyclicks in CW transmissions, affecting the dynamic range and noise background.<\/p>\n\n\n\n<p>Pluto&#8217;s internal memory can be used as a buffer &#8211; you record with high SR and then download it onto the PC.<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><strong>PLUTO:<\/strong>\ncd \/sys\/bus\/iio\/devices\/iio\\:device1\/\necho 98000000 &gt; out_altvoltage0_RX_LO_frequency\necho manual &gt; in_voltage0_gain_control_mode\necho 30 &gt; in_voltage0_hardwaregain\necho 20000000 &gt; in_voltage_sampling_frequency\necho 20000000 &gt; in_voltage_rf_bandwidth\ntime iio_readdev -b 50000 -s 20000000 cf-ad9361-lpc &gt; \/tmp\/samples\nhttpd -h \/tmp -p 1500\n\n<strong>PC:<\/strong>\nwget pluto.local:1500\/samples -O samples<\/pre>\n\n\n\n<p>How to later read the file in Gnu Radio:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/www.sp3yor.net\/wp-content\/uploads\/2024\/01\/image.png\"><img loading=\"lazy\" decoding=\"async\" width=\"858\" height=\"195\" src=\"https:\/\/www.sp3yor.net\/wp-content\/uploads\/2024\/01\/image.png\" alt=\"\" class=\"wp-image-1747\" srcset=\"https:\/\/www.sp3yor.net\/wp-content\/uploads\/2024\/01\/image.png 858w, https:\/\/www.sp3yor.net\/wp-content\/uploads\/2024\/01\/image-300x68.png 300w, https:\/\/www.sp3yor.net\/wp-content\/uploads\/2024\/01\/image-768x175.png 768w\" sizes=\"auto, (max-width: 858px) 100vw, 858px\" \/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>English below. Jak powszechnie wiadomo, g\u0142\u00f3wnym czynnikiem ograniczaj\u0105cym szerkopasmowo\u015b\u0107 PlutoSDR jest przepustowo\u015b\u0107 portu USB, pozwalaj\u0105ca na korzystanie z samplowania maksymalnie 4 MSPS. Ustawiaj\u0105c wy\u017csze samplowanie, na przyk\u0142ad 20 MSPS, 80% sampli zostanie zgubione, ale uzyskane w taki spos\u00f3b spektrum (FFT) &hellip; <a href=\"https:\/\/www.sp3yor.net\/?p=904\">Czytaj dalej <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-904","post","type-post","status-publish","format-standard","hentry","category-bez-kategorii"],"_links":{"self":[{"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=\/wp\/v2\/posts\/904","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=904"}],"version-history":[{"count":3,"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=\/wp\/v2\/posts\/904\/revisions"}],"predecessor-version":[{"id":1748,"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=\/wp\/v2\/posts\/904\/revisions\/1748"}],"wp:attachment":[{"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sp3yor.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}