{"id":350,"date":"2017-05-29T08:00:27","date_gmt":"2017-05-29T08:00:27","guid":{"rendered":"https:\/\/klubnl.pl\/wpr\/?p=350"},"modified":"2017-07-12T20:56:38","modified_gmt":"2017-07-12T20:56:38","slug":"zevs-na-82hz-albo-dziwne-nosne-w-zakresie-elf","status":"publish","type":"post","link":"https:\/\/klubnl.pl\/wpr\/en\/2017\/05\/29\/zevs-na-82hz-albo-dziwne-nosne-w-zakresie-elf\/","title":{"rendered":"ZEVS on 82Hz or strange carriers on ELF"},"content":{"rendered":"<p>The Russian ZEVS station is probably transmitting on 82Hz. More information about the station here:<\/p>\n<p><a href=\"http:\/\/www.vlf.it\/zevs\/zevs.htm\">http:\/\/www.vlf.it\/zevs\/zevs.htm<\/a><\/p>\n<p><a href=\"https:\/\/en.wikipedia.org\/wiki\/ZEVS_%28transmitter%29\">https:\/\/en.wikipedia.org\/wiki\/ZEVS_%28transmitter%29<\/a><!--more--><\/p>\n<p>The station uses two 60km ground dipoles as the transmitting antena.<\/p>\n<p>On 28 may 2017 at 16:27 UTC there was a weak signal at 82Hz (received at SQ5BPF, Warsaw\/Poland KO02md):<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-351\" src=\"https:\/\/klubnl.pl\/wpr\/wp-content\/uploads\/2017\/05\/capt01.jpg\" alt=\"\" width=\"1357\" height=\"859\" \/><\/p>\n<p>The 75Hz signal is probably local, although i haven&#8217;t seen it previously.<\/p>\n<p>Later the signal shifted to 88Hz. This is the spectrogram from\u00a0 28 may 2017 at 19:18 UTC:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-352\" src=\"https:\/\/klubnl.pl\/wpr\/wp-content\/uploads\/2017\/05\/capt1705282118.jpg\" alt=\"\" width=\"1357\" height=\"859\" \/><\/p>\n<p>Next day it was at 90Hz. Thisis the spectrogram from\u00a0 29 may 2017 at 6:37 UTC:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-353\" src=\"https:\/\/klubnl.pl\/wpr\/wp-content\/uploads\/2017\/05\/capt1705290621.jpg\" alt=\"\" width=\"1357\" height=\"859\" \/><\/p>\n<p>Few hours later at 08:05 UTC the signal went to 92Hz and disappeared a few minutes later at 09:11 UTC:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-360\" src=\"https:\/\/klubnl.pl\/wpr\/wp-content\/uploads\/2017\/05\/capt1705290830.jpg\" alt=\"\" width=\"1357\" height=\"859\" \/><\/p>\n<p>The signal is stable in frequency. This can be a local signal, intermod at my antenna\/receiver, or maybe this is antenna work at ZEVS and an attempt to test it outside the normally used 82Hz frequency. According to VLF.IT the transmitter can work at 20-250Hz.<\/p>\n<p>&nbsp;<\/p>\n<p>EDIT: signal analysis from the whole day shows a stable carrier at 82Hz, and various signals which are not that stable, probably resulting from intermodulation:<\/p>\n<p><a href=\"https:\/\/klubnl.pl\/wpr\/wp-content\/uploads\/2017\/05\/zevs5.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-364 size-full\" src=\"https:\/\/klubnl.pl\/wpr\/wp-content\/uploads\/2017\/05\/zevs5.png\" alt=\"\" width=\"2000\" height=\"1000\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na cz\u0119stotliwo\u015bci oko\u0142o 82Hz nadaje z Rosji stacja nazywana przez radioamator\u00f3w ZEVS (na li\u015bcie rsgb-lf-group napisano \u017ce to jest znak wywo\u0142awczy). Informacje s\u0105 na stronach: http:\/\/www.vlf.it\/zevs\/zevs.htm https:\/\/en.wikipedia.org\/wiki\/ZEVS_%28transmitter%29 &nbsp;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[17,15,16],"class_list":["post-350","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-82hz","tag-elf","tag-zevs"],"translation":{"provider":"WPGlobus","version":"3.0.1","language":"en","enabled_languages":["pl","en"],"languages":{"pl":{"title":true,"content":true,"excerpt":false},"en":{"title":true,"content":true,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/posts\/350","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/comments?post=350"}],"version-history":[{"count":10,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/posts\/350\/revisions"}],"predecessor-version":[{"id":423,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/posts\/350\/revisions\/423"}],"wp:attachment":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/media?parent=350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/categories?post=350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/tags?post=350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}