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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AXGSAAZUSF7RYJ6EMUGDNDB7PDCPVXBB/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "BCC1B21F8ADB4B4E83FB7BE9DC58A70F@GouldMainPC",
    "message_id_hash": "AXGSAAZUSF7RYJ6EMUGDNDB7PDCPVXBB",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/AL6AI76OPYN5C72L6KRDTWHPBJ3C5WB2/?format=api",
    "sender": {
        "address": "gouldsmi (a) bellsouth.net",
        "mailman_id": "9f2b000d905c4738ab035c94a0dffa89",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/9f2b000d905c4738ab035c94a0dffa89/emails/?format=api"
    },
    "sender_name": "Gould Smith",
    "subject": "[amsat-bb] Re: AO-51 Mode L/U",
    "date": "2008-04-09T23:16:16Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AL6AI76OPYN5C72L6KRDTWHPBJ3C5WB2/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello Jim,\n\nI routinely get the downlink quite well using an 8 element 70 cm yagi, with \na pre-amp at the antenna, fixed elevation, tracking in AZ . The digital \ntransmission is currently about 500 mW, but you need a good S/N ratio to \ndecode the data, even if your modem locks on to the clock.\n\nThe AMSAT Digital Guide has a very good description from actual experiments \nby Mike, N1JEZ on what is need in a 1.2 GHz uplink signal for digital \noperation on  AO-51.  GO-32 also has a 1.2 GHz uplink, but it has also needs \nmore signal than you are delivering.\n\nThe downlink reception is pretty easily and inexpensively corrected.  I am \nnot sure how the increase in TX delay time to a second will help your uplink \nas you didn't mention an amplifier needed to switch in.\n\nA good deal of the enjoyment for many of us is the challenge of getting \noperations on the satellites and the multiple modes they present.  I am sure \nthe digital guide would be of assistance to you.\n\n73,\nGould, WA4SXM\n\n\n--- Original Message ----- \nFrom: \"James Denneny\" <[email protected]>\nTo: <[email protected]>\nSent: Wednesday, April 09, 2008 3:16 PM\nSubject: [amsat-bb] AO-51 Mode L/U\n\n\n>I have had no luck uplinking on Mode L.  I even followed a suggestion to\n> increase TX delay to 999 ms and tail time to 100 ms to give the bird extra\n> time to grab me.  However, 10w from my 910H on 23cm with a single twisted\n> helix 1.2G antenna does not cut the mustard.  I also have had very limited\n> success on the 70cm downlink grabbing the DIR.  All in all - a bust.\n>\n>\n>\n> Jim\n>\n> K7EG\n>\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",
    "attachments": []
}