{"id":17279,"date":"2016-02-07T09:20:25","date_gmt":"2016-02-07T13:20:25","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=17279"},"modified":"2016-02-07T09:24:57","modified_gmt":"2016-02-07T13:24:57","slug":"china-radio-internationals-overwhelming-am-bandwidth-via-havana","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2016\/02\/china-radio-internationals-overwhelming-am-bandwidth-via-havana\/","title":{"rendered":"China Radio International’s overwhelming AM bandwidth via Havana"},"content":{"rendered":"

\"Scott-Marine-SLR-M-Dial\"<\/a><\/p>\n

This morning, I listened\u00a0to Radio Australia on 9,580 kHz with my WWII era Scott Marine Radio SLR-M (above).<\/p>\n

Radio Australia provides a reliable, strong\u00a0signal into North America every morning and it’s where I typically tune for the morning news at the top of the hour.<\/p>\n

China Radio International also fires up on the adjacent frequency of 9570 kHz around 1200 UTC–their signal is also incredibly strong here as it’s relayed from Radio Havana Cuba at 250 kW. CRI’s bandwidth is almost always wider than 10 kHz–indeed, it’s often 20 kHz–which means that it completely wipes out any average adjacent signal.<\/p>\n

Indeed, when I’m testing selectivity on portable shortwave radios, I’ll often tune to Radio Australia and wait for CRI to fire up on 9570 kHz. If the portable radio can still lock onto Radio Australia after CRI is on the air–or, better yet, if an upper side band sync lock can eliminate all traces of CRI–I know the receiver has decent selectivity.<\/p>\n

This morning, when CRI began transmitting at 1200 UTC, their signal completely<\/em> wiped out every trace of Radio Australia. Though the SLR-M’s narrow AM filter is still quite wide, it can typically cope with the adjacent CRI carrier.<\/p>\n

I fired up the TitanSDR to see what CRI’s signal looked like on a spectrum display–here’s what I found:<\/p>\n

\"China-Radio-International-Bandwidth\"<\/a><\/p>\n

CRI’s AM bandwidth was 30+ kHz<\/strong> wide!\u00a0<\/em><\/p>\n

In my book, that was an\u00a0abusive use of the band.<\/p>\n

This was, by no means, an isolated event. It was just particularly annoying for me this morning as I was enjoying a good cup of coffee and the morning ABC news.<\/p>\n

I’ll send a message to CRI and RHC about this, but I have my doubts anyone will take action.<\/p>\n

Okay–sorry about the rant!<\/p>\n","protected":false},"excerpt":{"rendered":"

This morning, I listened\u00a0to Radio Australia on 9,580 kHz with my WWII era Scott Marine Radio SLR-M (above). Radio Australia provides a reliable, strong\u00a0signal into North America every morning and it’s where I typically tune for the morning news at the top of the hour. China Radio International also fires up on the adjacent frequency […]<\/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":[56,3,43],"tags":[4738,141,429,1396,1212,4737],"class_list":["post-17279","post","type-post","status-publish","format-standard","hentry","category-broadcasters","category-news","category-shortwave-radio","tag-bandwidth","tag-china-radio-international","tag-cri","tag-radio-havana-cuba","tag-rhc","tag-shortwave-bandwidth"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-4uH","jetpack-related-posts":[{"id":7502,"url":"https:\/\/swling.com\/blog\/2013\/10\/shortwave-radio-recordings-radio-australia\/","url_meta":{"origin":17279,"position":0},"title":"Shortwave Radio Recordings: Radio Australia","author":"Thomas","date":"October 5, 2013","format":false,"excerpt":"Like most Friday mornings, yesterday at 11:00 UTC, I tuned to 9,580 kHz to listen to Radio Australia news and ABC National's technology program Download This Show. While the signal out of Shepparton, Australia was as strong as ever, I heard adjacent interference from China Radio International. Indeed, looking my\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"CRI-bandwidth","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/10\/CRI-bandwidth-300x265.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":5475,"url":"https:\/\/swling.com\/blog\/2013\/01\/shortwave-radio-recordings-radio-havana-cubas-dxers-unlimited\/","url_meta":{"origin":17279,"position":1},"title":"Shortwave Radio Recordings: Radio Havana Cuba’s DXers Unlimited","author":"Thomas","date":"January 27, 2013","format":false,"excerpt":"If you live in the Americas and you regularly listen to a shortwave radio, you have no doubt heard Radio Havana Cuba\u00a0across\u00a0the shortwave spectrum. When I travel in North or Central America, I can easily hear RHC, often without even extending the telescopic antenna on my portable. A long-running program\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"ArnieCoroDXersUnlimited","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/01\/ArnieCoroDXersUnlimited.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":17862,"url":"https:\/\/swling.com\/blog\/2016\/03\/bad-signals-transmitters-in-need-of-care\/","url_meta":{"origin":17279,"position":2},"title":"Bad Signals: Transmitters in need of care","author":"Thomas","date":"March 22, 2016","format":false,"excerpt":"China Radio International via Radio Havana Cuba Each morning, I enjoy listening to Radio Australia on 9,580 kHz, but I'm forced to tune elsewhere\u00a0due to interference\u00a0when China Radio International starts broadcasting on 9,570 kHz, via Radio Havana Cuba's relay. Hypothetically I should be able to mitigate any adjacent interference from\u2026","rel":"","context":"In "AM"","block_context":{"text":"AM","link":"https:\/\/swling.com\/blog\/category\/am\/"},"img":{"alt_text":"Click to enlarge","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/CRI-spectrum-1024x344.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/CRI-spectrum-1024x344.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/03\/CRI-spectrum-1024x344.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":8105,"url":"https:\/\/swling.com\/blog\/2013\/12\/video-tecsun-pl-880-vs-pl-660-and-coping-with-interference\/","url_meta":{"origin":17279,"position":3},"title":"Video: Tecsun PL-880 vs. PL-660 and coping with interference","author":"Thomas","date":"December 3, 2013","format":false,"excerpt":"I normally like to do in-line recordings for audio comparisons of radios, but my digital recorder is non-functional at the moment. This fact--coupled with a bit of reader peer pressure--prompted me to take a short video with my iPhone of the PL880 and PL660 in action. While this will not\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"Tecsun-PL880-SWLing-Post-0526","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/12\/Tecsun-PL880-SWLing-Post-0526-1024x682.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/12\/Tecsun-PL880-SWLing-Post-0526-1024x682.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/12\/Tecsun-PL880-SWLing-Post-0526-1024x682.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":12023,"url":"https:\/\/swling.com\/blog\/2015\/01\/23-january-2015-a-friday-morning-31-meter-band-scan\/","url_meta":{"origin":17279,"position":4},"title":"23 January 2015: A Friday morning 31 meter band scan","author":"Thomas","date":"January 23, 2015","format":false,"excerpt":"This morning, I tuned around the 31 meter band and was surprised with favorable\u00a0propagation out of Asia (see spectrum waterfall above--click to enlarge). I started logging\u00a0a few stations, but the effort\u00a0quickly turned into a full band scan\/survey. \u00a0I logged everything I could easily hear between the 9,390-10,000 kHz portion of\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"31-Meter-Waterfall-Spectrum","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/01\/31-Meter-Waterfall-Spectrum-1024x444.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/01\/31-Meter-Waterfall-Spectrum-1024x444.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/01\/31-Meter-Waterfall-Spectrum-1024x444.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":8755,"url":"https:\/\/swling.com\/blog\/2014\/02\/nothing-on-shortwave-i-still-disagree\/","url_meta":{"origin":17279,"position":5},"title":"Nothing on shortwave? I still disagree.","author":"Thomas","date":"February 10, 2014","format":false,"excerpt":"One of the most popular posts on the SWLing Post is one published nearly two years ago: \"Is there anything to listen to on shortwave?\" In that article, I posted recordings made on the 31 meter band of eight different broadcasters, all of which I found within a 250 kHz\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"SpectrumDisplay-31Meters-WinRadioExcalibur","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/02\/SpectrumDisplay-31Meters-WinRadioExcalibur.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/02\/SpectrumDisplay-31Meters-WinRadioExcalibur.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/02\/SpectrumDisplay-31Meters-WinRadioExcalibur.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/02\/SpectrumDisplay-31Meters-WinRadioExcalibur.jpg?resize=700%2C400 2x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/17279","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=17279"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/17279\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=17279"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=17279"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=17279"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}