{"id":14704,"date":"2015-09-09T10:18:47","date_gmt":"2015-09-09T14:18:47","guid":{"rendered":"http:\/\/swling.com\/blog\/?p=14704"},"modified":"2015-09-09T10:18:47","modified_gmt":"2015-09-09T14:18:47","slug":"from-fessenden-to-hd-radio-navigation","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2015\/09\/from-fessenden-to-hd-radio-navigation\/","title":{"rendered":"From Fessenden to HD Radio navigation"},"content":{"rendered":"
\"IBOC<\/a>

IBOC Spectrum (Source: GPS World)<\/p><\/div>\n

SWLing Post<\/em> contributor, Richard Langley<\/a>, is not only a dedicated shortwave DXer, but he’s also on the faculty of the\u00a0Department of Geodesy and Geomatics Engineering<\/a> at the University of New Brunswick. Additionally, Richard coordinates\u00a0Innovation<\/em>: a regular GPS World feature<\/a> that discusses advances in GPS technology and its applications.<\/p>\n

The latest Innovation<\/em> feature is absolutely fascinating<\/a> in that it highlights the potential for\u00a0AM broadcast band HD radio signals (IBOC) to be an effective navigation aid. Richard’s introduction to this article takes us back to the time of Reginald Fessenden:<\/p>\n

THE YEAR WAS 1906.<\/strong> On Christmas Eve of that year, Canadian inventor Reginald Fessenden carried out the first amplitude modulation (AM) radio broadcast of voice and music. He used a high-speed alternator capable of rotating at up to 20,000 revolutions per minute (rpm). Connected to an antenna circuit, it generated a continuous wave with a radio frequency equal to the product of the rotation speed and the number of magnetic rotor poles it had. With 360 poles, radio waves of up to about 100 kHz could be generated. However, Fessenden typically used a speed of 10,000 rpm to produce 60 kHz signals. By inserting a water-cooled microphone in the high-power antenna circuit, he amplitude-modulated the transmitted signal. On that Christmas Eve, he played phonograph records, spoke and played the violin with radio operators being amazed at what they heard.<\/p>\n

Fessenden had earlier worked with spark-gap transmitters, as these were standard at the time for the transmission of Morse code, or telegraphy, the wireless communication method already in use. But they couldn\u2019t generate a continuous wave and couldn\u2019t produce satisfactory AM signals. But as telegraphy was the chief means of communication, they remained in use for many years along with high-powered alternators and the Poulsen arc transmitter, which could also generate continuous waves.<\/p>\n

Continue reading at GPSworld.com…<\/a><\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

SWLing Post contributor, Richard Langley, is not only a dedicated shortwave DXer, but he’s also on the faculty of the\u00a0Department of Geodesy and Geomatics Engineering at the University of New Brunswick. Additionally, Richard coordinates\u00a0Innovation: a regular GPS World feature that discusses advances in GPS technology and its applications. The latest Innovation feature is absolutely fascinating […]<\/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":[373,3,288],"tags":[4196,2220,4193,4194,4195,4197,3516],"class_list":["post-14704","post","type-post","status-publish","format-standard","hentry","category-am","category-news","category-radio-history","tag-am-digital","tag-digital-radio","tag-gps","tag-gps-world","tag-iboc","tag-navigation","tag-richard-langley"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-3Pa","jetpack-related-posts":[{"id":15047,"url":"https:\/\/swling.com\/blog\/2015\/10\/anniversary-of-sputnik-i-launch-radio-moscow\/","url_meta":{"origin":14704,"position":0},"title":"Anniversary of Sputnik I Launch & Radio Moscow","author":"Thomas","date":"October 5, 2015","format":false,"excerpt":"Many thanks to SWLing Post contributor, Richard Langley, who writes: Yesterday, 4 October, was the anniversary of the Soviet Union's launch of Sputnik I, the first artificial Earth satellite. The launch heralded the beginning of the space age. Sputnik I's Doppler-shifted radio transmissions on 20.005 and 40.002 MHz led to\u2026","rel":"","context":"In "Boat Anchors"","block_context":{"text":"Boat Anchors","link":"https:\/\/swling.com\/blog\/category\/boat-anchors-2\/"},"img":{"alt_text":"radio_moscow_sputnik_card_side1","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/10\/radio_moscow_sputnik_card_side1-726x1024.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/10\/radio_moscow_sputnik_card_side1-726x1024.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/10\/radio_moscow_sputnik_card_side1-726x1024.jpg?resize=525%2C300 1.5x"},"classes":[]},{"id":12603,"url":"https:\/\/swling.com\/blog\/2015\/03\/richards-cbc-radio-canada-qsl-and-interview-with-rci\/","url_meta":{"origin":14704,"position":1},"title":"Richard’s CBC Radio-Canada QSL and interview with RCI","author":"Thomas","date":"March 12, 2015","format":false,"excerpt":"Many thanks to SWLing Post and SRAA contributor, Richard Langley, who writes: \"[C]oncerning the RCI anniversary, attached are scans of a QSL card from the CBC International Service for reception on 20 April 1964 when I was in high school. That was on the Knight-Kit Span Master regenerative receiver I\u2026","rel":"","context":"In "Interviews"","block_context":{"text":"Interviews","link":"https:\/\/swling.com\/blog\/category\/interviews\/"},"img":{"alt_text":"radio_canada1","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/03\/radio_canada1.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/03\/radio_canada1.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/03\/radio_canada1.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2015\/03\/radio_canada1.jpg?resize=700%2C400 2x"},"classes":[]},{"id":27455,"url":"https:\/\/swling.com\/blog\/2017\/08\/reuters-cyber-threats-prompt-return-of-radio-for-ship-navigation\/","url_meta":{"origin":14704,"position":2},"title":"Reuters: Cyber threats prompt return of radio for ship navigation","author":"Thomas","date":"August 7, 2017","format":false,"excerpt":"(Source: Reuters via\u00a0Ken Hansen and Dan Hawkins) LONDON (Reuters) - The risk of cyber attacks targeting ships' satellite navigation is pushing nations to delve back through history and develop back-up systems with roots in World War Two radio technology. Ships use GPS (Global Positioning System) and other similar devices that\u2026","rel":"","context":"In "Digital Modes"","block_context":{"text":"Digital Modes","link":"https:\/\/swling.com\/blog\/category\/digital-modes\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/08\/eLoran_URSANAV.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/08\/eLoran_URSANAV.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/08\/eLoran_URSANAV.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/08\/eLoran_URSANAV.jpg?resize=700%2C400 2x"},"classes":[]},{"id":35233,"url":"https:\/\/swling.com\/blog\/2019\/01\/am-receiver-design-with-regards-to-iboc-bandwidth-claims\/","url_meta":{"origin":14704,"position":3},"title":"AM receiver design with regards to IBOC bandwidth claims","author":"Thomas","date":"January 10, 2019","format":false,"excerpt":"Many thanks to SWLing Post contributor, Emilio Ruiz, who writes: Hi Thomas, I'm writing because found this (interesting) analysis about radio components and the impact on radio receiver quality: http:\/\/www.geocities.ws\/shreddermanrulz\/myth1.htm I think may be are interesting topic for readers of the SWLing Post. This is interesting, Emilio.\u00a0 Thank you for\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\/2018\/01\/XHData-D-808-Open-Circuit-Board-3-1024x626.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/01\/XHData-D-808-Open-Circuit-Board-3-1024x626.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2018\/01\/XHData-D-808-Open-Circuit-Board-3-1024x626.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":28414,"url":"https:\/\/swling.com\/blog\/2017\/09\/pantronx-titus-ii-is-ready-for-production\/","url_meta":{"origin":14704,"position":4},"title":"PantronX: Titus II is ready for production","author":"Thomas","date":"September 19, 2017","format":false,"excerpt":"(Source: Radio World via Richard Langley) Titus SDR, a division of PantronX, says the Titus II multi-standard digital radio receiver is ready for production. The consumer software-defined radio digital receiver platform, which is the result of collaboration between Titus SDR\/Patron X, Jasmin-Infotech, TWR, and Fraunhofer IIS, supports multi-standard radio reception,\u2026","rel":"","context":"In "New Products"","block_context":{"text":"New Products","link":"https:\/\/swling.com\/blog\/category\/new-products\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2017\/09\/TitusII.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":25158,"url":"https:\/\/swling.com\/blog\/2017\/04\/pantronx-titus-ii-drm-receiver-update-via-wavescan\/","url_meta":{"origin":14704,"position":5},"title":"PantronX Titus II DRM receiver update via Wavescan","author":"Thomas","date":"April 11, 2017","format":false,"excerpt":"Many thanks to SWLing Post contributor, Richard Langley, who writes: There was a segment on the latest episode of AWR's Wavescan (9 April 2017) about the Titus II DRM receiver recorded during the recent HFCC meeting in Jordan. In it, it was stated that the shipment of the first 1500\u2026","rel":"","context":"In "Digital Modes"","block_context":{"text":"Digital Modes","link":"https:\/\/swling.com\/blog\/category\/digital-modes\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2016\/08\/titus-2-big.gif?resize=350%2C200","width":350,"height":200},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/14704","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=14704"}],"version-history":[{"count":0,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/14704\/revisions"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=14704"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=14704"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=14704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}