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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YYLTNWHGAVNMC7EPCBLMNGNEPKQXHNQN/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "YYLTNWHGAVNMC7EPCBLMNGNEPKQXHNQN",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ZQALNLLKQLP7E7UR53PBALIGEXFJQHKL/?format=api",
    "sender": {
        "address": "nate (a) natetech.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Nate Duehr",
    "subject": "[amsat-bb] Re: Preamp for a Mobile Application",
    "date": "2008-04-02T20:38:10Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZQALNLLKQLP7E7UR53PBALIGEXFJQHKL/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nOn Mar 31, 2008, at 8:01 AM, Bill Dzurilla wrote:\n> Kent,\n>\n> Never tried it, but I doubt a preamp would be worth\n> the expense if mounted at the rig in a mobil set-up.\n> I assume the feedline is only 10' or so.  The preamp\n> helps most when the feedline is lengthy, especially if\n> cheap coax is used.\n\n\nAgreed with all of Bill's comments, snipped to save space.\n\nThe \"dollars to dBs\" value proposition for pre-amps in a mobile  \ninstallation with short coax runs doesn't work out until after you  \nhave an incredibly large antenna system.\n\nA higher gain antenna and a way to point it \"buys\" you a lot more  \nsignal at the receiver, and is probably cheaper -- up to a point.  It  \nalso helps you out on transmit, so you get \"double-duty\" out of  \nantenna system upgrades.\n\n(One can always look at some of the papers from organizations like the  \nSoutheastern VHF Society, from weak signal VHF terrestrial  \nenthusiasts, especially \"rover\" stations in this particular case to  \nsee the math to engineer the \"best\" system one can for mobile weak- \nsignal operations, since that's all Satellite work really is... weak- \nsignal operating with a need to point the antenna more critically and  \nmore often, in both a horizontal and vertical plane, and different  \noperating techniques.  At the end of the day, other than Doppler  \nshift, the RF physics are the same.)\n\n--\nNate Duehr, WY0X\[email protected]\n\n\n\n",
    "attachments": []
}