{"id":64316,"date":"2025-10-19T07:28:28","date_gmt":"2025-10-19T11:28:28","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=64316"},"modified":"2025-10-19T07:28:28","modified_gmt":"2025-10-19T11:28:28","slug":"bobs-radio-corner-shortwave-multiplex","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2025\/10\/bobs-radio-corner-shortwave-multiplex\/","title":{"rendered":"Bob’s Radio Corner: Shortwave Multiplex?"},"content":{"rendered":"

\"\"<\/a>Reported by Bob Colegrove<\/strong><\/p>\n

Incurable DXers are always looking for new challenges.\u00a0 So it was, I recently did some scanning between 42 and 45 meters (~6600 to 7000 kHz).\u00a0 Trenton Military on 6754 kHz and the MARS net on 6913 kHz are regulars here, as are a selection of pirates above 6900 kHz.\u00a0 However, I have never experienced anything like this.\u00a0 It took me a while to sort things out.\u00a0 A pirate on 6930 kHz was quickly detected on the upper sideband, but there was some garble slightly lower.\u00a0 It turned out to be a few folks having a QSO in Spanish on the lower sideband of 6930 kHz.<\/p>\n

\"\"<\/a>Two transmissions both squatting on the same frequency.\u00a0 The irony was, sans<\/i> carriers, there was absolutely no mutual interference.\u00a0 Each signal was clearly received by alternately pressing the USB and LSB buttons.\u00a0 Likely the QSO folks were somewhat out of band for 40 meters, and it goes without saying that the pirate shouldn\u2019t have been there.\u00a0 Nevertheless, I would call that efficient use of the spectrum.<\/p>\n

Date:\u00a0 October 11, 2025<\/p>\n

Time:\u00a0 0030 until 0100 UTC<\/p>\n

Receiver:\u00a0 Tecsun PL-880<\/p>\n

Antenna:\u00a0 Bob\u2019s Updated Passive, Resonant, Transformer-Coupled Loop Antenna for Shortwave<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Reported by Bob Colegrove Incurable DXers are always looking for new challenges.\u00a0 So it was, I recently did some scanning between 42 and 45 meters (~6600 to 7000 kHz).\u00a0 Trenton Military on 6754 kHz and the MARS net on 6913 kHz are regulars here, as are a selection of pirates above 6900 kHz.\u00a0 However, I […]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"closed","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":[3,43],"tags":[7988,10732,4082],"class_list":["post-64316","post","type-post","status-publish","format-standard","hentry","category-news","category-shortwave-radio","tag-bob-colegrove","tag-bobs-radio-corner","tag-shortwave-radio"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pn3uc-gJm","jetpack-related-posts":[{"id":63114,"url":"https:\/\/swling.com\/blog\/2025\/06\/bobs-radio-corner-tuning-single-letter-cluster-beacons\/","url_meta":{"origin":64316,"position":0},"title":"Bob’s Radio Corner: Tuning Single-Letter Cluster Beacons","author":"Thomas","date":"June 8, 2025","format":false,"excerpt":"Tuning Single-Letter Cluster Beacons by Bob Colegrove Part of the allure of shortwave listening for me has always been vicarious visits to \u201cthose faraway places with the strange-soundin' names.\u201d\u00a0 After one has logged several big-time broadcasters, one begins to look for new challenges.\u00a0 Most of the so-called \u201cutility\u201d content which\u2026","rel":"","context":"In "Beacons"","block_context":{"text":"Beacons","link":"https:\/\/swling.com\/blog\/category\/beacons\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/06\/Table-2-LSB-DESKTOP-LGN2IGT.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/06\/Table-2-LSB-DESKTOP-LGN2IGT.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/06\/Table-2-LSB-DESKTOP-LGN2IGT.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":64980,"url":"https:\/\/swling.com\/blog\/2025\/12\/bobs-radio-corner-industrial-scientific-and-medical-ism-bands\/","url_meta":{"origin":64316,"position":1},"title":"Bob’s Radio Corner: Industrial, Scientific, and Medical (ISM) Bands","author":"Thomas","date":"December 21, 2025","format":false,"excerpt":"Industrial, Scientific, and Medical (ISM) Bands Noted by Bob Colegrove This is not the sort of thing you might consider typical DX.\u00a0 One reporter traced a signal like the one I describe here to the innocuous utility box at the corner of his lot.\u00a0 No, it is not noise.\u00a0 It\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\/2025\/12\/Fig-1.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/12\/Fig-1.jpeg?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":64459,"url":"https:\/\/swling.com\/blog\/2025\/11\/bobs-radio-corner-its-dx-season\/","url_meta":{"origin":64316,"position":2},"title":"Bob’s Radio Corner: It\u2019s DX Season","author":"Thomas","date":"November 2, 2025","format":false,"excerpt":"Noted by Bob Colegrove In the Northern Hemisphere the nights continue to get longer as we approach the winter solstice; we gain an hour of early evening darkness on Sunday, November 2nd; the summer atmospheric disturbances are nearly gone; propagation is better.\u00a0 It\u2019s time to set aside the activities of\u2026","rel":"","context":"In "DX"","block_context":{"text":"DX","link":"https:\/\/swling.com\/blog\/category\/dx\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2025\/11\/Fig-2.-Oswald.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":60925,"url":"https:\/\/swling.com\/blog\/2024\/10\/bob-asks-whats-your-favorite-corner-of-the-dial\/","url_meta":{"origin":64316,"position":3},"title":"Bob asks: “What\u2019s Your Favorite Corner of the Dial?”","author":"Thomas","date":"October 21, 2024","format":false,"excerpt":"Many thanks to\u00a0SWLing Post\u00a0contributor,\u00a0Bob Colegrove, who shares the following guest post: What\u2019s Your Favorite Corner of the Dial? As asked by Bob Colegrove Let\u2019s suppose you\u2019ve been listening to radio for a while.\u00a0 Consciously or not, you\u2019ve probably favored a range of AM, SW, or FM frequencies.\u00a0 These are areas\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\/2024\/10\/Fig-5.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":60935,"url":"https:\/\/swling.com\/blog\/2024\/10\/responding-to-the-colegrove-inspiration\/","url_meta":{"origin":64316,"position":4},"title":"Responding to “The Colegrove Inspiration”","author":"Jock Elliott","date":"October 24, 2024","format":false,"excerpt":"By Jock Elliott, KB2GOM It was Bob Colegrove\u2019s post -- this one\u00a0-- that inspired me and set me on this path. Medium wave broadcast band DXing (MWBCB) has a certain fascination for me, but I am poor at it. Oh sure, I have read the advice: map the band at\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\/2024\/10\/Satellit-on-1690-001-001-1024x662.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/10\/Satellit-on-1690-001-001-1024x662.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2024\/10\/Satellit-on-1690-001-001-1024x662.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":12232,"url":"https:\/\/swling.com\/blog\/2015\/02\/pulling-radio-santa-cruz-out-of-the-interference\/","url_meta":{"origin":64316,"position":5},"title":"Pulling Radio Santa Cruz out of the interference","author":"Thomas","date":"February 7, 2015","format":false,"excerpt":"I recorded Radio Santa Cruz early this morning around 05:00\u00a0UTC on 6,135\u00a0kHz using\u00a0the TitanSDR I currently have under review. Radio Santa Cruz\u2018s 10 kW signal from Santa Cruz, Bolivia, was very much audible here in North America, though RSC was\u00a0competing\u00a0with another station on-frequency at the time. Actually, Radio Santa Cruz\u2026","rel":"","context":"In "How To"","block_context":{"text":"How To","link":"https:\/\/swling.com\/blog\/category\/how-to\/"},"img":{"alt_text":"Bolivia","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/08\/Bolivia-1024x549.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/08\/Bolivia-1024x549.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2014\/08\/Bolivia-1024x549.jpg?resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/64316","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=64316"}],"version-history":[{"count":1,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/64316\/revisions"}],"predecessor-version":[{"id":64319,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/64316\/revisions\/64319"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=64316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=64316"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=64316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}