{"id":421,"date":"2017-01-27T20:30:18","date_gmt":"2017-01-27T20:30:18","guid":{"rendered":"http:\/\/auroralpower.ca\/?page_id=421"},"modified":"2017-01-27T20:30:18","modified_gmt":"2017-01-27T20:30:18","slug":"weak-signal-work-with-wspr","status":"publish","type":"page","link":"https:\/\/auroralpower.ca\/?page_id=421","title":{"rendered":"Weak Signal work with WSPR"},"content":{"rendered":"<p>WSPR is a\u00a0QRP mode that can be setup quickly with most transceivers. \u00a0The bands in use are from\u00a0630 m to 70 cm and above. \u00a0Each band has a designated WSPR center with a passband\u00a0of 200 hz. The message that is transmitted consists only of you call and maidenhead locator eg. VE6JI DO46gs. \u00a0The receiving station shows your call, locator, frequency drift in hz\/min, and time offset. \u00a0The decode nature of WSPR requires that both the sender &amp; receiver have clocks that are synchronized very closely to the atomic standard.<\/p>\n<p>Once the signals of the receiving station have been decoded, they are then posted to\u00a0<a href=\"http:\/\/wsprnet.org\/drupal\/wsprnet\/map\" target=\"_blank\">WSPRnet<\/a>. \u00a0WSPR transmissions are often the weakest transmissions at 5w and less. \u00a0This opens up a QRPr world to amateurs using non-standard transmitters &amp; receivers. \u00a0Reception and reporting can be accomplished using $20 SDR dongles and a random length of wire. \u00a0Transmission can be accomplished with homebrewed equipment using a Raspberry Pi and a 100 mw ssb transmitter. \u00a0Design considerations should include frequency stability and time stability. \u00a0Of course your $12,000 IC-7851 will work perfectly well too. \u00a0Antennas are not critical as you will be receiving signals from all over the world.<\/p>\n<blockquote><p>Joe Taylor, K1JT, describes it best: \u00a0From <a href=\"http:\/\/physics.princeton.edu\/pulsar\/k1jt\/wspr.html\">http:\/\/physics.princeton.edu\/pulsar\/k1jt\/wspr.html<\/a><\/p>\n<p>WSPR implements a protocol designed for probing potential propagation paths with low-power transmissions.\u00a0 Normal transmissions carry a station&#8217;s callsign, Maidenhead grid locator, and transmitter power in dBm.\u00a0 The program can decode signals with S\/N as low as -28 dB in a 2500 Hz bandwidth.\u00a0 Stations with internet access can automatically upload their reception reports to a central database called <a href=\"http:\/\/wsprnet.org\/\">WSPRnet<\/a>, which includes a mapping facility.<\/p><\/blockquote>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-medium wp-image-422\" src=\"https:\/\/auroralpower.ca\/wordpress\/wp-content\/uploads\/2017\/01\/wspr-ve6ji-300x195.jpg\" alt=\"\" width=\"300\" height=\"195\" srcset=\"https:\/\/auroralpower.ca\/wordpress\/wp-content\/uploads\/2017\/01\/wspr-ve6ji-300x195.jpg 300w, https:\/\/auroralpower.ca\/wordpress\/wp-content\/uploads\/2017\/01\/wspr-ve6ji-768x499.jpg 768w, https:\/\/auroralpower.ca\/wordpress\/wp-content\/uploads\/2017\/01\/wspr-ve6ji.jpg 901w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>To learn more please go to\u00a0<a href=\"http:\/\/physics.princeton.edu\/pulsar\/k1jt\/wspr.html\">http:\/\/physics.princeton.edu\/pulsar\/k1jt\/wspr.html<\/a>\u00a0Software downloads are also listed on this page.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WSPR is a\u00a0QRP mode that can be setup quickly with most transceivers. \u00a0The bands in use are from\u00a0630 m to 70 cm and above. \u00a0Each band has a designated WSPR center with a passband\u00a0of 200 hz. The message that is transmitted consists only of you call and maidenhead locator eg. VE6JI DO46gs. \u00a0The receiving station [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"jetpack_post_was_ever_published":false},"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P87vep-6N","_links":{"self":[{"href":"https:\/\/auroralpower.ca\/index.php?rest_route=\/wp\/v2\/pages\/421"}],"collection":[{"href":"https:\/\/auroralpower.ca\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/auroralpower.ca\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/auroralpower.ca\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/auroralpower.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=421"}],"version-history":[{"count":0,"href":"https:\/\/auroralpower.ca\/index.php?rest_route=\/wp\/v2\/pages\/421\/revisions"}],"wp:attachment":[{"href":"https:\/\/auroralpower.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=421"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}