{"id":19485,"date":"2016-06-17T07:00:09","date_gmt":"2016-06-17T11:00:09","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=19485"},"modified":"2016-06-17T06:57:20","modified_gmt":"2016-06-17T10:57:20","slug":"steve-points-out-the-itu-r-recommendations-on-radio-noise","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2016\/06\/steve-points-out-the-itu-r-recommendations-on-radio-noise\/","title":{"rendered":"Steve notes the ITU-R Recommendations on Radio Noise"},"content":{"rendered":"

\"SX-99-Dial\"<\/a><\/p>\n

Commenting on our post about the FCC Noise Floor Inquiry<\/a>, SWLing Post<\/em> contributor, Steve Yothment writes:<\/p>\n

One of the definitive documents on Radio Noise is the ITU-R Recommendation on Radio Noise, version P.373-12. This (latest) version is dated 07\/2015, so it’s only a year old. You can download it [as a PDF] here<\/a>. It has a lot of info on natural and man-made radio noise.<\/p>\n

My favorite graph from the document is shown below:<\/p><\/blockquote>\n

\"Graph\"<\/a><\/p>\n

It shows the level of radio noise vs. frequency for good and poor conditions. It can be rather surprising how noise, even under the best conditions, can be quite excessive on shortwave frequencies. For example, the best case noise level for 10 MHz is about 30dB above the Johnson Noise level. (That’s the noise level from just a resistor at room temperature.) That’s why the noise level in your shortwave receiver’s speaker gets so much higher when you attach the antenna!<\/p><\/blockquote>\n

That is fascinating, Steve! It’s no wonder we struggle with noise issues–even in the best of times, it appears.<\/p>\n","protected":false},"excerpt":{"rendered":"

Commenting on our post about the FCC Noise Floor Inquiry, SWLing Post contributor, Steve Yothment writes: One of the definitive documents on Radio Noise is the ITU-R Recommendation on Radio Noise, version P.373-12. This (latest) version is dated 07\/2015, so it’s only a year old. You can download it [as a PDF] here. It has […]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[545,3,43],"tags":[5174,1241,5173,5175],"class_list":["post-19485","post","type-post","status-publish","format-standard","hentry","category-ham-radio","category-news","category-shortwave-radio","tag-et-docket-16-191","tag-fcc","tag-fcc-technological-advisory-council-tac","tag-noise-floor-inquiry"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-54h","jetpack-related-posts":[{"id":19477,"url":"https:\/\/swling.com\/blog\/2016\/06\/fcc-noise-floor-inquiry\/","url_meta":{"origin":19485,"position":0},"title":"FCC Noise Floor Inquiry","author":"Thomas","date":"June 16, 2016","format":false,"excerpt":"Many thanks to SWLing Post reader, Bill, who shares this public notice from the FCC: Comment Deadline: August 11, 2016 The FCC\u2019s Technological Advisory Council (TAC), an advisory group to the FCC operating under the\u00a0Federal Advisory Committee Act, is investigating changes and trends to the radio spectrum noise floor to\u00a0determine\u2026","rel":"","context":"In "Ham Radio"","block_context":{"text":"Ham Radio","link":"https:\/\/swling.com\/blog\/category\/ham-radio\/"},"img":{"alt_text":"FCC-Public-Notice","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/06\/FCC-Public-Notice.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/06\/FCC-Public-Notice.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/06\/FCC-Public-Notice.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/06\/FCC-Public-Notice.jpg?resize=700%2C400 2x"},"classes":[]},{"id":17902,"url":"https:\/\/swling.com\/blog\/2016\/03\/the-society-of-broadcast-engineers-urges-fcc-to-improve-mediumwave-rfi\/","url_meta":{"origin":19485,"position":1},"title":"The Society of Broadcast Engineers urges FCC to Improve Mediumwave RFI","author":"Thomas","date":"March 23, 2016","format":false,"excerpt":"(Source: ARRL via Eric McFadden, WD8RIF) The Society of Broadcast Engineers (SBE) has told the FCC that the regulatory agency needs to take another tack in its efforts to tackle AM revitalization. If the FCC takes the SBE\u2019s advice, the result could be less noise in the MF and HF\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"WHKY-AM-Radio-Tower","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/WHKY-AM-Radio-Tower.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/WHKY-AM-Radio-Tower.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/WHKY-AM-Radio-Tower.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/WHKY-AM-Radio-Tower.jpg?resize=700%2C400 2x"},"classes":[]},{"id":27076,"url":"https:\/\/swling.com\/blog\/2017\/07\/radioworld-steps-to-lower-noise-floor-and-revitalize-am-radio\/","url_meta":{"origin":19485,"position":2},"title":"RadioWorld: Steps to Lower Noise Floor and Revitalize AM Radio","author":"Thomas","date":"July 13, 2017","format":false,"excerpt":"(Source: RadioWorld via Richard Langley) Noise interference is the menace of all wireless broadcast communications services Background noise interference is degrading the quality of broadcast reception, two-way communications, mobile cellphone services and every other form of wireless communications used today at an alarming rate. The FCC and the ITU agree\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/WHKY-AM-Radio-Tower.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/WHKY-AM-Radio-Tower.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/WHKY-AM-Radio-Tower.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/02\/WHKY-AM-Radio-Tower.jpg?resize=700%2C400 2x"},"classes":[]},{"id":8974,"url":"https:\/\/swling.com\/blog\/2014\/03\/wsj-fcc-agents-trace-radio-interference\/","url_meta":{"origin":19485,"position":3},"title":"WSJ: “FCC Agents Trace Radio Interference”","author":"Thomas","date":"March 12, 2014","format":false,"excerpt":"I'm happy to see RFI being mentioned in the Wall Street Journal. Many thanks to SWLing Post reader, Ulis, for the tip: (Source: Wall Street Journal) A federal agent who shows up unannounced at a building along a Texas highway might be looking for any number of things: illicit drugs\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"Poorly engineered fluorescent ballasts are oftern culprits of broad spectrum radio interference. 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Though still awaiting approval by the FCC in the US, the RadioJet is available for order through the manufacturer in\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2011\/11\/RadioJetNotebook-300x213.png?resize=350%2C200","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/19485","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/comments?post=19485"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/19485\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=19485"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=19485"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=19485"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}