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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TMWECBPBIGVNJZSV7JTOJ7UDF3S4OZIF/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "C265730D633F42818784AA1FCE086ABE@KC6UQH",
    "message_id_hash": "TMWECBPBIGVNJZSV7JTOJ7UDF3S4OZIF",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/XAF5QHTK3JMAGZIIG4V6LCDFE5OVFSFU/?format=api",
    "sender": {
        "address": "kc6uqh (a) cox.net",
        "mailman_id": "d9201820d18047e4a2772c86bda5e111",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9201820d18047e4a2772c86bda5e111/emails/?format=api"
    },
    "sender_name": "Art McBride",
    "subject": "[amsat-bb] Re: Turn off AGC when receiving BPSK-1000",
    "date": "2011-08-19T17:12:55Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EQCQQE5AJLPN2IALRM2PFTM3K2MCOGPM/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Phil,\n\nIf you have access to the December 1970 issue of the Microwave Journal there\nis data on a 1 wavelength, 1 turn Quadrifilar Helix with a beam width of\ngreater than 180 degrees. Only the 1/2 turn 1/2 wave is popular today, the\n140 degree beam with offers the best front to back ratio @ 0.3 axial\nwavelengths.\nArt,\nKC6UQH  \n\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Phil Karn\nSent: Thursday, August 18, 2011 10:44 PM\nTo: Dave Guimont\nCc: [email protected]\nSubject: [amsat-bb] Re: Turn off AGC when receiving BPSK-1000\n\nOn 8/18/11 10:31 PM, Dave Guimont wrote:\n\n> That's why the quadrifilars work so well. I measured the pattern some\n> time back, and the \"beam width\" is about 140 degrees....\n\nYes, something with that kind of beamwidth would be ideal on the\nnadir-facing surface of a stabilized satellite in low earth orbit. It\nwould be even better if the gain in the straight-down direction could be\nreduced in favor of gain at the edges. Ideally you'd have a constant\npower density over the entire visible earth.\n\nYou could of course use a much more directional antenna on the ground if\nit can track the satellite.\n\n--Phil\n\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 6391 (20110819) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n\n\n \n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 6393 (20110819) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n \n\n",
    "attachments": []
}