{"id":319,"date":"2022-02-04T17:06:43","date_gmt":"2022-02-04T17:06:43","guid":{"rendered":"https:\/\/fletch.scot\/wp\/?p=319"},"modified":"2022-02-04T17:06:43","modified_gmt":"2022-02-04T17:06:43","slug":"yet-another-wspr-transmitter","status":"publish","type":"post","link":"https:\/\/fletch.scot\/wp\/?p=319","title":{"rendered":"Yet Another WSPR Transmitter"},"content":{"rendered":"

I have joined the ranks of the many who have built a WSPR<\/a> Transmitter. Why? Mostly so I can have a bit of fun. The problem is difficult enough to be interesting but not so complex as to become boring. Having said that there\u2019s a lot involved.<\/p>\n

I can transmit WSPR with my TS590S and presumably any other off-the-shelf transceiver. But these all have fan noise so I wouldn\u2019t want to run them overnight. So the transmitter will be able to be used to test propagation overnight.<\/p>\n

But mostly I\u2019ve made it to have the fun of making it.<\/p>\n

The transmitter cycles through the amateur bands from 80m to 10m optionally transmitting on each band. An RTC module (DS3231 I2C Real Time Clock Module<\/a>) is used to keep track of the real time. An AD9850 DDS Signal Generator Module<\/a> produces the RF signal. Both of these are controlled by a\u00a0D1 Mini ESP8266 Dev Board<\/a>. The ESP8266 does all the encoding of the WSPR tones and decides when to send them. The signal from the AD9850 is run through a power amp (10W linear HF PA from QRP Labs<\/a>) then through an appropriate LPF to the aerial.<\/p>\n

\"WSPR<\/p>\n

Currently I\u2019ve only had it on air on the 40m band as I only have a home-brew\u00a040m LPF<\/a> to hand. This works fine and the signals are being picked up in Europe ok. I\u2019m getting a switchable LPF<\/a> for the other bands but it\u2019s taking a while to arrive from Russia. However the transmitter works on every band as my TS590S close to the transmitter can pick up the stray signals when I run it into a dummy load. The signals are decoded fine using WSJT-X.<\/p>\n

More details later.<\/p>\n","protected":false},"excerpt":{"rendered":"

I have joined the ranks of the many who have built a WSPR Transmitter. Why? Mostly so I can have a bit of fun. The problem is difficult enough to be interesting but not so complex as to become boring. Having said that there\u2019s a lot involved. I can transmit WSPR with my TS590S and … <\/p>\n

Continue reading “Yet Another WSPR Transmitter”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[6,5,34],"class_list":["post-319","post","type-post","status-publish","format-standard","hentry","tag-aerial","tag-programming","tag-radio"],"_links":{"self":[{"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=\/wp\/v2\/posts\/319","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=319"}],"version-history":[{"count":1,"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=\/wp\/v2\/posts\/319\/revisions"}],"predecessor-version":[{"id":320,"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=\/wp\/v2\/posts\/319\/revisions\/320"}],"wp:attachment":[{"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=319"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=319"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fletch.scot\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}