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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/M4DG3V75DDLJ5VFSKHD3PROWAZUB3Q6F/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "M4DG3V75DDLJ5VFSKHD3PROWAZUB3Q6F",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TA6BOO4LN4JZLYNLKQRMDK4X6JJRBEXC/?format=api",
    "sender": {
        "address": "ve9qrp (a) gmail.com",
        "mailman_id": "4d6061838db34aba9a1c4722addebfaf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4d6061838db34aba9a1c4722addebfaf/emails/?format=api"
    },
    "sender_name": "Bruce Robertson",
    "subject": "[amsat-bb] Re: Mode A antennas?",
    "date": "2009-09-12T14:04:54Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TA6BOO4LN4JZLYNLKQRMDK4X6JJRBEXC/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Sat, Sep 12, 2009 at 12:32 AM, John Geiger <[email protected]> wrote:\n> What is the minimal antenna you can use on 10m to hear the AO7 downlink in Mode A?  I have a homebrew G5RV type antenna up and can't hear AO7 on it at all.  What kind of antennas are others using on 10m for mode A?\n>\n> 73s John AA5JG\n>\n\nJohn --\n\nI have had verticals of heights between 23' and 45' that could hear\nthe 10m downlink, even when connected to 100' of RG-8 and no preamp.\n\nMy guess is that your G5RV is highly directional at 10m. Such long\ndoublets develop flower petal lobes of high gain in the horizontal\ndimension with very deep nulls between them. On HF this isn't such a\nbig issue, since the RF is going *somewhere*: you probably don't care\nif you work NZ or Australia. (Ok, with the sunspots these days you'd\nbe overjoyed with either.) However, with satellite reception such\npatterns make reception very difficult. Moreover, your G5RV is likely\nto be up a good height at 10m, pushing its vertical pattern down to\nthe horizon. So now, to hear this bird, it has to be between, say 5\ndeg up and 15 deg. up and within the 'petals' of the horizonal\npattern.\n\nHere's a situation where less truly might be more. A lowish dipole\nwill reduce the lobes, and crummy vertical will too, though in the\nother dimension.\n\nLet us know how things work!\n\n73, Bruce\nVE9QRP\n\n",
    "attachments": []
}