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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FDYM6OXLPELOMHOF42IU7YKHNPIZ2RET/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "FDYM6OXLPELOMHOF42IU7YKHNPIZ2RET", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ZKPBAFTSAMPMXAI3HD3E52MVTYDPQFWB/?format=api", "sender": { "address": "n3tl (a) bellsouth.net", "mailman_id": null, "emails": null }, "sender_name": "Tim - N3TL", "subject": "[amsat-bb] Re: Doppler Tuning Convention Question", "date": "2010-06-01T01:42:09Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/J642EBTTUGZOCYTZUB2P7X5UUPGSQO3M/?format=api", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/S5HL5QMYCSRX2VQUFHV45H3MIDLA5PKD/?format=api", "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TIPHOAS6LJXAWSDH6PJ4JWJAKJ5QATEM/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Alan, John and all,\n\nThere is no question that computer-controlled Doppler tuning makes working\nthe linear satellites easier. That being said, I am glad that my lack of a\ncomputer to dedicate to ham radio forced me to learn and use manual tuning\nby following the one true rule of always tuning the higher frequency.\n\nThese days, I often use SatPC 32 for computer control when I use my two\nFT-817 QRP rigs for the satellites. But last year, right after Field Day,\nthe CAT plug on my FT-857D stopped working. Because of the choices I've made\nabout my station setup (i.e., a totally portable station that I can set up\nand operate anywhere at any time), I need to use the 857 as a transmit radio\nin order to work the DX into Europe and Africa that I have on AO-7 Mode B.\nAnd without its higher power on 2 meters, I would not have gotten Hawaii\ninto the log earlier this year on FO-29 from Adrian, AA5UK/KH6. Since the\nCAT plug died on the 857, I have been manually tuning on every pass during\nwhich I use that radio. \n\nI really like being able to do it, even if I don't have to. I hope new\nsatellite operators will take the time to at least develop the basic ability\nto effectively use manual tuning. But then - dinosaur that I am - I also\nwish more amateurs in general would at least learn Morse Code at slow speeds\n... hihi.\n\nAnd since we're on the topic ... has anyone else noticed that the latest\nedition of \"The ARRL Satellite Handbook\" uses VO-52 as the example for\nDoppler tuning - and that it suggests that newcomers who are manually tuning\nfor Doppler park their transmit frequency on the UHF uplink and tune the VHF\ndownlink (i.e., the exact opposite of the One True Rule)? That is really\nmystifying and disappointing.\n\nAlan, I have no doubt that you're right about the necessity for Doppler\ncontrol above Mode B satellites. Having always preferred the KISS approach\nwhenever possible, I suppose that's why I haven't been able to get myself\nvery excited for L- and S-band opportunities. I definitely enjoy the\nbenefits of computer control for Doppler. I just don't much care for having\nno choice in using it (or not) to effectively work a satellite.\n\n73 to all,\n\nTim - N3TL\n\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Alan P. Biddle\nSent: Monday, May 31, 2010 6:07 PM\nTo: 'John Belstner'; [email protected]\nSubject: [amsat-bb] Re: Doppler Tuning Convention Question\n\nJohn,\n\nMacDoppler, SATPC32, Ham Radio Deluxe, and other programs all support what\nhas been called the One True Rule. The usual name for the implementation is\nFull Doppler Tuning. You are doing it right. When everyone does this, it\nprovides a very pleasant opportunity to talk instead of tune. It also keeps\nfrom drifting all over another QSO, though the transponders are seldom full\nthese days.\n\nHowever, that is not to say that people not using this are doing it wrong,\nexactly. There are still many rigs in use which do not have the capability\nfor computer frequency control. In the old days, the rule was to tune the\nhighest frequency, whether uplink or downlink, since this is where the\nDoppler shift is greatest. Take a look at KB5MU's original article and\nupdates here:\n\nhttp://www.amsat.org/amsat/features/one_true_rule.html\n\nMy suggestion is to use full tuning until you find that the other operator\nisn't. Then adapt, usually by turning off the updating for the lower\nfrequency. It isn't worth getting doctrinaire about it. However, by using\nthe One True Rule as the default, you set a good example and encourage the\nmovement of other operators in this direction. As you will find, it is\ntruly painful to do it the manual way after getting used to automagic\ntuning. As we move above 70 cms, full tuning truly becomes necessary.\n\nAlan\nWA4SCA\n\n\n\n\n \n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of John Belstner\nSent: Monday, May 31, 2010 3:36 PM\nTo: [email protected]\nSubject: [amsat-bb] Doppler Tuning Convention Question\n\nI know there is a lot of discussion on this subject in the AMSAT archives,\nbut I've recently read a few posts to the BB that have me confused.\n\nJust this weekend I got my Sat station on the air (FT-736R w/MacDoppler) and\nI noticed that the MacDoppler program I use adjusts both the TX and RX\nfrequencies during the satellite pass. I'm assuming this is to keep my\nsignal located in the same place in the transponder. The program seemed to\nwork quite well. I was able to copy several QSO's on VO-52 and made a\ncouple contacts as well.\n\nOne thing I noticed is that about half the QSO's I copied did not require\nany manual tuning on my part (MacDoppler adjusted the RX correctly) while\nthe other half did. According to MacDoppler, those that did require manual\ntuning were moving around within the transponder passband.\n\nI've read a few posts (one as recent as today) that suggested the convention\nis to keep the RX frequency fixed and manually adjusting the TX frequency\nwhile monitoring the downlink. Looking through the AMSAT archives this is\nthe old convention prior to the popularity of tracking software and CAT\ncontrol. So my question is, are there two conventions? or do I not have my\nsoftware configured correctly?\n\nSorry for what might seem like a stupid question, but I'm a newbie to this\nfacet of Ham Radio. BTW, I'm having a blast!\n\nCheers,\n\nJohn Belstner\[email protected]\n\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n", "attachments": [] }