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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DIM3435L6SKEL7ADRHQ4HU6KYEDKLD7T/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000101c7b439$581bc920$c4e6fea9@WA4SCA",
    "message_id_hash": "DIM3435L6SKEL7ADRHQ4HU6KYEDKLD7T",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/2IF5XBZZ6SDACHWVBRBLCBWYIIF5GBBC/?format=api",
    "sender": {
        "address": "APBIDDLE (a) UNITED.NET",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Alan P. Biddle",
    "subject": "[amsat-bb] Re: no go 1.2 on AO-51",
    "date": "2007-06-21T19:21:18Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2IF5XBZZ6SDACHWVBRBLCBWYIIF5GBBC/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Bob,\n\nThe Doppler runs something like +/- 25 KHz.  From my measurements, and\ncomments heard, there is an informal consensus that probably the real center\nof the uplink is more like 1268.703 or so.  You need to be within about 5\nKHz to get in well, and if you are running a lot of power, you can get by a\nbit further off.  I am pretty well netted to the uplink, and required power\nranges from 1-2 watts to 80 watts to get a good signal, depending on\nlocation, S/C orientation, and number of trees in the way.  This using about\n70' of Heliax to a 32 element M2.  \n\nGuys running without computer control to the TX drop out a lot.  Other\nthings to check are the pointing accuracy, which becomes more important with\nmore directive arrays.  One test worth doing, if the situation permits, is\nto use a Bird or similar wattmeter and measure the power directly at the\nantenna.  I found a big problem that way once, and then worked backward\ntoward the station to eventually find the bad connector.  WI2W is getting in\nwith a 10 element yagi and 10 watts, so while more EIRP is definitely\nbetter, it can be done. \n\nAlan\nWA4SCA\n\n\n\n",
    "attachments": []
}