{"id":262,"date":"2015-07-22T22:50:48","date_gmt":"2015-07-23T06:50:48","guid":{"rendered":"https:\/\/www.eskimo.com\/~nanook\/radio\/?p=262"},"modified":"2015-07-22T23:34:03","modified_gmt":"2015-07-23T07:34:03","slug":"maximum-usable-frequency-21-mhz","status":"publish","type":"post","link":"https:\/\/www.eskimo.com\/~nanook\/radio\/2015\/07\/22\/maximum-usable-frequency-21-mhz\/","title":{"rendered":"Maximum Usable Frequency > 21 Mhz"},"content":{"rendered":"

\u00a0\u00a0\u00a0\u00a0 I am currently receiving a station in the Chinese language on 21550.00 Khz varying in strength between -76 dBm and -88 dBm (s7-s9) while my propagation widget is telling me 160 meters is fair and everything above that non-existent.\u00a0 <\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0 There are some deep fades and very bad selective fading that occasionally renders the signal unintelligible even when the signal is strong. There are some quite strong signals above 17 Mhz.\u00a0 Given that it’s almost midnight local time this is somewhat unusual, especially given the relatively weak solar cycle.<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0 There is another station receivable on 21690.00 Khz but it is -90 dBm or less in strength and although I can tell there is a male voice, I can only hear it during peaks and there is too much noise to even discern the language.<\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0 I scanned higher and found nothing and in ten minutes time 21690.00 Khz is no longer receivable, not even detectable.\u00a0 The station on 21550.00 Khz is also gone.\u00a0 Nothing above 19Mhz is receivable now.\u00a0 There is a very strange periodically recurring signal between 18990 Khz and 19001 Khz that is almost like they’re trying to create an image in a spectrograph.\u00a0 Check it out.\u00a0 Tell me that isn’t weird.\u00a0 It repeats about every 30 seconds or so.<\/span><\/p>\n

\"19mhz\"<\/p>\n

\u00a0\u00a0\u00a0\u00a0 This is one mysterious weird signal.\u00a0 Now 17,985 is the lowest frequency I can receive any voice transmissions on.\u00a0 The propagation has changed dramatically in half an hour.\u00a0 Time for me to call it a night.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\u00a0\u00a0\u00a0\u00a0 I am currently receiving a station in the Chinese language on 21550.00 Khz varying in strength between -76 dBm and -88 dBm (s7-s9) while my propagation widget is telling me 160 meters is fair and everything above that non-existent.\u00a0 … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-262","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/posts\/262","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/comments?post=262"}],"version-history":[{"count":0,"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/posts\/262\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/media?parent=262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/categories?post=262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.eskimo.com\/~nanook\/radio\/wp-json\/wp\/v2\/tags?post=262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}