{"id":5311,"date":"2009-03-03T04:50:00","date_gmt":"2009-03-02T17:50:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2009\/03\/03\/homebrew-wspr-from-w3pm\/"},"modified":"2025-07-21T18:44:06","modified_gmt":"2025-07-21T08:44:06","slug":"homebrew-wspr-from-w3pm","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2009\/03\/03\/homebrew-wspr-from-w3pm\/","title":{"rendered":"Homebrew WSPR from W3PM"},"content":{"rendered":"<p><a onblur=\"try {parent.deselectBloggerImageGracefully();} catch(e) {}\" href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2009\/03\/W3PMWSPR090.jpg\"><img decoding=\"async\" style=\"margin: 0px auto 10px; display: block; text-align: center; cursor: pointer; width: 400px; height: 286px;\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2009\/03\/W3PMWSPR090.jpg\" alt=\"\" id=\"BLOGGER_PHOTO_ID_5308819840788254178\" border=\"0\" \/><\/a>Recently I&#8217;ve been reading with envy the <a href=\"http:\/\/physics.princeton.edu\/pulsar\/K1JT\/WSPR_Instructions.TXT\">WSPR<\/a> reports from <a href=\"http:\/\/brainwagon.org\/2009\/02\/21\/wspr-update\/\">K6HX<\/a>. Mark tells how he walks into his shack each morning and is greeted with signal reports from around the world. Beautiful maps are presented, with lines arcing from Southern California to distant islands in the South Pacific. I burn with envy. I want to WSPR too! But I have no SSB gear for 30 meters, and unlike our beloved visual MEPT QRSS, WSPR requires SSB gear. <\/p>\n<p>I had mentioned all this on SolderSmoke, and this morning Gene, W3PM, came to the rescue. He sent info on a really interesting and very simple SSB transceiver. Take a look at the block diagram. On transmit it is essentially a DSB rig with a filter at the operating frequency to knock down the unwanted sideband. On receive it is a Direct Conversion receiver preceded by a narrow filter that allows the WSPR frequencies through. It uses the familiar SBL-1 mixer. The filter has only one crystal. And &#8211;icing on the cake &#8212; Gene built his version in modular form, with each module in an Altoids tin. Clearly, this is the WSPR rig for us!<\/p>\n<p>Gene provides a very nice write up on his project here:<br \/><a href=\"http:\/\/www.knology.net\/%7Egmarcus\/WSPR\/wspr2.pdf\" target=\"_blank\"><span class=\"yshortcuts\" id=\"lw_1236056972_1\">http:\/\/www.knology.net\/~gmarcus\/WSPR\/wspr2.pdf<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Recently I&#8217;ve been reading with envy the WSPR reports from K6HX. Mark tells how he walks into his shack each morning and is greeted with signal reports from around the world. Beautiful maps are presented, with lines arcing from Southern California to distant islands in the South Pacific. I burn with envy. I want to &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2009\/03\/03\/homebrew-wspr-from-w3pm\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Homebrew WSPR from W3PM&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":5312,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-5311","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-wspr"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/5311","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=5311"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/5311\/revisions"}],"predecessor-version":[{"id":5313,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/5311\/revisions\/5313"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/5312"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=5311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=5311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=5311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}