{"id":66903,"date":"2026-08-28T07:14:49","date_gmt":"2026-08-28T11:14:49","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=66903"},"modified":"2026-08-27T07:20:20","modified_gmt":"2026-08-27T11:20:20","slug":"waterfall-images-from-pirate-radio","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2026\/08\/waterfall-images-from-pirate-radio\/","title":{"rendered":"Waterfall images from pirate radio"},"content":{"rendered":"

Many thanks to SWLing Post<\/em> contributor Dan Greenall, who writes:<\/strong><\/p>\n

Hi Thomas<\/p>\n

The concept of transmitting images through SDR waterfalls is relatively new to me. Last weekend, while listening to pirate Radio 48 (via Mix Radio International) remotely on SDRs in Rochester, NY, and Cape Cod, MA, I snapped these photos of their 10 kHz-wide USB signal on 6935, along with some of the pictures and text that scrolled down beside it.<\/p>\n

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

Less than 24 hours later, I came across another stream of graphics, this time on 6960 kHz. It displayed a web page address for Radio Free Spirit. These were followed by a brief stream of audio on USB of a man and woman having a conversation, which ended abruptly without any announcement. I searched out an email address for Radio Free Spirit and sent off an inquiry. Within 15 minutes, a response was received confirming it had been them, simply running a test and had not expected anyone to hear them or reply.<\/p>\n

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

Photos taken of both stations are attached here along with some related audio clips.<\/p>\n

Radio 48:<\/strong><\/p>\nhttps:\/\/swling.com\/blog\/wp-content\/uploads\/2026\/08\/Radio-48-via-Mix-Radio-International-1-kb1vwc.ddns_.net_2026-08-02T03_00_31Z_6935.00_usb.mp3<\/a><\/audio>\nhttps:\/\/swling.com\/blog\/wp-content\/uploads\/2026\/08\/Radio-48-via-Mix-Radio-International-2-SND.k2zn.ddns_.net_2026-08-02T02_28_16Z_6935.00_usb.mp3<\/a><\/audio>\n

Radio Free Spirit:<\/strong><\/p>\nhttps:\/\/swling.com\/blog\/wp-content\/uploads\/2026\/08\/RFS-Radio-Free-Spirit-audio-SND.k2zn.ddns_.net_2026-08-02T16_42_05Z_6960.00_usb.mp3<\/a><\/audio>\n

I am wondering if others have had experiences with this type of reception and if any international broadcasters have ever dabbled in it.<\/p>\n

73<\/p>\n

Dan Greenall, Ontario, Canada<\/p>\n","protected":false},"excerpt":{"rendered":"

Many thanks to SWLing Post contributor Dan Greenall, who writes: Hi Thomas The concept of transmitting images through SDR waterfalls is relatively new to me. Last weekend, while listening to pirate Radio 48 (via Mix Radio International) remotely on SDRs in Rochester, NY, and Cape Cod, MA, I snapped these photos of their 10 kHz-wide […]<\/p>\n","protected":false},"author":15,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_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},"jetpack_post_was_ever_published":false},"categories":[3,297,43],"tags":[10271,4092,11175],"class_list":["post-66903","post","type-post","status-publish","format-standard","hentry","category-news","category-pirate-radio","category-shortwave-radio","tag-dan-greenall","tag-pirate-radio","tag-waterfall-images"],"jetpack_publicize_connections":[],"jetpack_shortlink":"https:\/\/wp.me\/pn3uc-hp5","jetpack-related-posts":[{"id":57675,"url":"https:\/\/swling.com\/blog\/2023\/08\/pirate-radio-peter-decodes-spectrum-images-from-mix-radio-international\/","url_meta":{"origin":66903,"position":0},"title":"Pirate Radio: Peter decodes spectrum images from Mix Radio International","author":"Thomas","date":"August 30, 2023","format":false,"excerpt":"Many thanks to SWLing Post contributor, Pete Jernakoff, who writes: Last evening around 10:45 pm local, I came across the pirate Mix Radio International broadcasting on 6950 kHz upper side band. Signal was absolutely huge at my QTH (northern Delaware) and the show was highly entertaining with dance and rap\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\/2023\/08\/MRI-Third-Image.jpeg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/MRI-Third-Image.jpeg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/MRI-Third-Image.jpeg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/MRI-Third-Image.jpeg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2023\/08\/MRI-Third-Image.jpeg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":7365,"url":"https:\/\/swling.com\/blog\/2013\/09\/pirate-radio-recordings-radio-gallifrey-intergalactic\/","url_meta":{"origin":66903,"position":1},"title":"Pirate Radio Recordings: Radio Gallifrey Intergalactic","author":"Thomas","date":"September 21, 2013","format":false,"excerpt":"Last night, I recorded pirate station,\u00a0Radio Gallifrey Intergalactic. RGI appeared on 6,935 kHz USB and started their broadcast with a set of audio sweeps (which looked rather distinctive on my SDR's waterfall), followed by tones and then straight into the Dr. Who theme. What followed was a free-form set of\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"The Citadel of the Time Lords on Gallifrey (Source: Wikimedia Commons)","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/09\/Gallifrey_Sound_of_Drums-300x173.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":5740,"url":"https:\/\/swling.com\/blog\/2013\/02\/pirate-radio-recordings-wolverine-radio-4\/","url_meta":{"origin":66903,"position":2},"title":"Pirate Radio Recordings: Wolverine Radio","author":"Thomas","date":"February 23, 2013","format":false,"excerpt":"For your listening pleasure: 2 hours and 46 minutes of pirate radio station, Wolverine Radio--recorded\u00a0Sunday, February 17, 2013 around 2:40 UTC. Wolverine was broadcasting on 6.925 MHz in the upper side band. Typical of Wolverine, lots of music variety which spans the decades, and no commentary other than station ID\u2026","rel":"","context":"In "Pirate Radio"","block_context":{"text":"Pirate Radio","link":"https:\/\/swling.com\/blog\/category\/pirate-radio\/"},"img":{"alt_text":"Wolverine1","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/02\/Wolverine11.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":5635,"url":"https:\/\/swling.com\/blog\/2013\/02\/pirate-radio-recordings-wolverine-radio-3\/","url_meta":{"origin":66903,"position":3},"title":"Pirate Radio Recordings: Wolverine Radio","author":"Thomas","date":"February 16, 2013","format":false,"excerpt":"Wolverine Radio\u00a0was the strongest of the pirate radio stations I heard last night. Wolverine was broadcasting on 6.935 MHz in the upper side band. Very good signal and excellent fidelity for SSB. Typical of Wolverine, lots of music variety and no commentary other than station ID throughout. \u00a0 Wolverine Radio\u2013at\u2026","rel":"","context":"In "Broadcasters"","block_context":{"text":"Broadcasters","link":"https:\/\/swling.com\/blog\/category\/broadcasters\/"},"img":{"alt_text":"\"It's time for some Wolverine Radio!\"","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2011\/07\/RadioListening-300x190.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":8391,"url":"https:\/\/swling.com\/blog\/2013\/12\/just-arrived-2013-pirate-radio-annual\/","url_meta":{"origin":66903,"position":4},"title":"Just arrived! The 2013 Pirate Radio Annual","author":"Thomas","date":"December 22, 2013","format":false,"excerpt":"Happiness is finding the new 2013 Pirate Radio Annual in your mailbox! If you love pirate radio, or simply want to learn more about it, the Pirate Radio Annual is a must read! Find out how to get your own Pirate Radio Annual by clicking here. I'll try to post\u2026","rel":"","context":"In "Books"","block_context":{"text":"Books","link":"https:\/\/swling.com\/blog\/category\/books\/"},"img":{"alt_text":"2013 Pirate Radio Annual","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/12\/photo-9.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":15343,"url":"https:\/\/swling.com\/blog\/2015\/10\/tune-in-halloween-weekend-is-a-pirate-radio-playground\/","url_meta":{"origin":66903,"position":5},"title":"Tune in: Halloween weekend is a pirate radio playground!","author":"Thomas","date":"October 30, 2015","format":false,"excerpt":"Halloween is typically the most active day of the year for shortwave pirates...so, here are three\u00a0things you'll want to do this Halloween: Listen for pirate radio stations this weekend! \u00a0Turn on your radio anytime this weekend, but especially around twilight and tune between 6,800 - 6,990 kHz. Pirates broadcast on\u2026","rel":"","context":"In "News"","block_context":{"text":"News","link":"https:\/\/swling.com\/blog\/category\/news\/"},"img":{"alt_text":"Haloween-Pirate-Radio","src":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/11\/Haloween-Pirate-Radio-1024x640.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/11\/Haloween-Pirate-Radio-1024x640.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/swling.com\/blog\/wp-content\/uploads\/2013\/11\/Haloween-Pirate-Radio-1024x640.jpg?resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/66903","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=66903"}],"version-history":[{"count":1,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/66903\/revisions"}],"predecessor-version":[{"id":66915,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/posts\/66903\/revisions\/66915"}],"wp:attachment":[{"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/media?parent=66903"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/categories?post=66903"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/swling.com\/blog\/wp-json\/wp\/v2\/tags?post=66903"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}