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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WX5YLI4Y7A2I6PL7REZLBLZZDFI47NJK/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "WX5YLI4Y7A2I6PL7REZLBLZZDFI47NJK",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YHT6M7WUTPZUS6CJ7JH3GPD63CNRGR3N/",
    "sender": {
        "address": "hans.bx2abt (a) msa.hinet.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Hans BX2ABT",
    "subject": "Re: [amsat-bb] non-doppler correction on linear sats",
    "date": "2019-05-11T13:20:12Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/74VJI6XU2O2UA64X464RH7O2W5C74ZS2/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello Umesh,\n\nI tried it the other day, but you need to constantly re-tune the \nreceiving signal, while handling your key and the rotator at the same \ntime. During low elevations the drift is minor, but high elevations and \nyou find yourself very busy. It's doable, but it begs for automation of \nsome parts of the system.\n\nThe last couple of days not many passes I could be active. Hopefully \nnext week is going to be better for more tries. Cheers for the advice.\n\nHans\n\nBX2ABT\n\n\nOn 05/10/2019 02:50 AM, [email protected] wrote:\n> Hans,\n>\n> The funny thing is that if both stations don't auto-correct for \n> doppler they can stay in QSO for much longer since both will \"walk\" \n> the satellite's pass band.  I guess this is how it worked in the good \n> old days.\n>\n> So, when I faced this situation, I would tune to the calling station \n> then turn OFF my auto-correction and adjust only the uplink slightly \n> to hear myself when transmitting. It worked in most cases.  If the \n> calling station puts out a very short CQ, like in FM sats, just TX and \n> ask them to do a longer call.\n>\n>\n> GL es 73!\n> Umesh, k6vug\n>\n>\n> On Thursday, May 9, 2019, 1:08:16 AM PDT, Hans BX2ABT via AMSAT-BB \n> <[email protected]> wrote:\n>\n>\n> How to deal with signals (CW/SSB) where the other party doesn't seem to\n> do doppler correction? I use an Airspy/IC820H combo to receive (2m) and\n> transmit (70cm) and both are controlled by Gpredict so that uplink and\n> downlink on linear sats stay in tune. However, I hear many stations that\n> apparently don't do this and their signals \"walk\" up very fast, right\n> out of my passband. Difficult to get their call, let alone have a QSO.\n> So what should be my strategy to deal with this?\n>\n> 73 de Hans\n>\n> BX2ABT\n>\n>\n\n",
    "attachments": []
}