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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BIZC7LR5WKD74KAPOLU2ZOOG3TRJPOPG/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "[email protected]", "message_id_hash": "BIZC7LR5WKD74KAPOLU2ZOOG3TRJPOPG", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/5MQI2WTSOV7M2FJ6XBISZMTORTINY62X/", "sender": { "address": "kb5eko1 (a) yahoo.com", "mailman_id": "beebe944a1354fccb813e7d561147c88", "emails": "https://mailman.amsat.org/hyperkitty/api/sender/beebe944a1354fccb813e7d561147c88/emails/" }, "sender_name": "Jerry Davis", "subject": "[AMSAT-BB] Re: Digital Modes on Linear Sats", "date": "2022-10-11T22:00:14Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KED7VWAOYDMT37T6FJKRNMTZHWQ6TGQO/", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": " It really doesn't matter what frequency is the standard. Most of the guys I know have set their Doppler at 5K above the bottom, but there is a lot of movement going on. The gentleman's agreement was to stay at the lower end of the passband with the digital modes. You may see FreeDV and PSK signals down there also. FT 4 works great on the4 XW, CAS, JO-97 and EO-88 birds. Our group has elected not to get on those birds due to the limited bandwidth and the interference with SSB QSO's. Now if it's late at night a few of us may be on, but it's at a time when there usually no one on the bird. \n\nCheers,Jerry - N5EKO\n\n\n On Tuesday, October 11, 2022 at 03:03:26 PM CDT, Mike Swiatkowski <[email protected]> wrote: \n \n 5 kHz is just as good! Maybe better. Let's go with that!\nMike, AA9VI\nOn Tue, Oct 11, 2022 at 3:01 PM Mark Johns, K0JM <[email protected]> wrote:\n\nAlmost everyone in North America is operating at 5 kHz up from the bottom of the downlink passband. I set my WSJT-x at 435.6115. Once in a while I see somebody CQing beyond the passband, more than 3 kHz up from that frequency, but I don't know if they actually work anybody.--\nMark D. Johns, KØJM\nAMSAT Ambassador & News Service Editor\nBrooklyn Park, MN USA EN35hd\n-----------------------------------------------\"Heaven goes by favor; if it went by merit, you would stay out and your dog would go in.\" ---Mark Twain\n\nOn Tue, Oct 11, 2022 at 2:53 PM Mike Swiatkowski <[email protected]> wrote:\n\nI read a message from Jerry, N5EKO, that the gentleman's agreement is to operate 3-10 kHz above the bottom band edge. WSJT-X may show you about 2.5 to 3 kHz of passband on a typical computer screen. So, that 7 kHz seems a bit much to monitor all at once. I think it'd be easier to just pick a standard calling offset from the bottom band edge to monitor when the satellite is passing. If we all started listening to +3 kHz to +5.5 kHz USB FT4 mode from the band edge it's a simple rule of thumb and we know where to listen to those signals seemingly under the noise floor. Many users don't have a band scope. So, a designated offset would be helpful.\nExample: RS-44 Satellite downlink passband is 435.61 - 435.67 MHzListen or CQ by setting SATPC32 satellite (not rig since it changes due to doppler) frequency to 435.613 USB mode and choosing FT4 on WSJT-X\n\nso, the satellite (not rig) downlink frequency for FO-29 = 435.803AO-07 = 145.928 HO-113 = 435.168and so forth for other satellites. Maybe the XWs, CAs, JO-97, and EO-88 birds would be good for FT4, too.\n\nMike, AA9VIEN52\n-----------------------------------------------------------\n\nSent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions expressed\nare solely those of the author, and do not reflect the official views of AMSAT-NA. \nAcceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/\n\nView archives of this mailing list at\nhttps://mailman.amsat.org/hyperkitty/list/[email protected]\nTo unsubscribe send an email to amsat-bb-leave(a)amsat.org\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org\n\n\n-----------------------------------------------------------\n\nSent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions expressed\nare solely those of the author, and do not reflect the official views of AMSAT-NA. \nAcceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/\n\nView archives of this mailing list at\nhttps://mailman.amsat.org/hyperkitty/list/[email protected]\nTo unsubscribe send an email to amsat-bb-leave(a)amsat.org\nManage all of your AMSAT-NA mailing list preferences at https://mailman.amsat.org \n\n\n", "attachments": [ { "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BIZC7LR5WKD74KAPOLU2ZOOG3TRJPOPG/", "counter": 2, "name": "attachment.html", "content_type": "text/html", "encoding": "utf-8", "size": 7693, "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/BIZC7LR5WKD74KAPOLU2ZOOG3TRJPOPG/attachment/2/attachment.html" } ] }