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GET /hyperkitty/api/list/[email protected]/email/J62GDLPXWENR6N77K6CKW5QHKXAUUS5M/
{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/J62GDLPXWENR6N77K6CKW5QHKXAUUS5M/", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/", "message_id": "CAPovOweHe6k2AKQQZSkkrBvvSYmJRc+Z7+0Ez6AkCteyM059rg@mail.gmail.com", "message_id_hash": "J62GDLPXWENR6N77K6CKW5QHKXAUUS5M", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RWMK2QVLL5LTKVOYCLTH57T5PYNMO44I/", "sender": { "address": "kayakfishtx (a) gmail.com", "mailman_id": null, "emails": null }, "sender_name": "Clayton Coleman", "subject": "[amsat-bb] Re: Listening on USB when operating CW", "date": "2014-02-07T20:04:42Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CTYC4C3S7LQHQKEW5HKEYM7M6DUAPMIW/", "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LMOMDOXRYBQ6PO66QH4BBGZBDMCZCLNQ/" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Peter,\n\nThat is correct and what I have attempted to describe. A station not\nadjusting properly for Doppler shift will appear to \"move\" across the\npassband into stations who are making corrections. (voice or CW)\n\nThere are several categories for correction, as I see it by order of\noccurrence...(and there may be more)\n\n1 - People who use \"full\" Doppler correction via software, adjusting\nboth TX and RX to stay on the satellite's frequency.\n\n2 - People who use \"half\" Doppler correction by tuning the higher of\ntwo frequencies. This is common for people who are portable or want\nthe simplest method of staying on another station. In the mode, you\nwill move slightly. I do this often in the field. It's not perfect.\n\n3 - People who use \"TX only\" correction. I see this often and I\nbelieve it's an incorrect practice to always tune TX because sometimes\nthat means on mode J you'll likely move across QSO's in progress.\n\n4 - Probably the least common I observe, people who use \"full\" Doppler\ncorrection manually. I believe it is a little more difficult to do\nthis on fast moving LEO's, especially on CW.\n\nMy original email was trying to discover whether or not listening on\nUSB while transmitting on CW might make it easier for \"CW drifters\" to\nknow they are part of a problem. Occasionally when this problem\noccurs with USB voice, the perpetrating stations are not able to hear\nwell enough to know they are causing a problem.\n\n73\nClayton\nW5PFG\n\nOn Fri, Feb 7, 2014 at 11:33 AM, Ng, Peter <[email protected]> wrote:\n> Yes, the frequency in use by the CW station that is not adjusting for doppler will appear to be moving for stations that are adjusting for doppler....right?\n>\n> Peter ve7ngp\n>\n>\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] On Behalf Of John Becker\n> Sent: February 7, 2014 09:27\n> To: [email protected]\n> Subject: [amsat-bb] Re: Listening on USB when operating CW\n>\n>\n> On 2/7/2014 11:18 AM, Ng, Peter wrote:\n>> Correct me if I'm wrong, but doesn't automatic doppler corrections dynamically change your frequency to compensate for doppler? Would this mean anyone engaging in doppler correction are actually drifting into a stable frequency?\n>>\n> by \"stable\" do you mean a freq already being used?\n>\n> John, W0JAB\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n", "attachments": [] }