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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZTCYHCUL73AEI7PNHKTJET7QF2V6IQRP/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "ZTCYHCUL73AEI7PNHKTJET7QF2V6IQRP",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ZTCYHCUL73AEI7PNHKTJET7QF2V6IQRP/",
    "sender": {
        "address": "w9gb (a) icloud.com",
        "mailman_id": "b156075684ac4750b888b2dd14137a40",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b156075684ac4750b888b2dd14137a40/emails/"
    },
    "sender_name": "Gregory Beat",
    "subject": "Re: [amsat-bb] NASA Helical Antenna Question",
    "date": "2018-05-08T13:22:46Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I posted the NASA upgrade article on QRZ Satellite Forum, April 28, 2018\nhttps://forums.qrz.com/index.php?threads/nasa-upgrades-space-station-emergency-communications-ground-stations.608557/\n\nPatrick Stoddard, WD9EWK provided additional information from \nthe frequency chart at the ISS Fan Club web site.\nVHF1 is 143.625 MHz FM, and \nVHF2 is 130.167 MHz FM\n\nISS Fan Club web site: https://www.issfanclub.com/\nISS Frequency Chart (includes telemetry downlinks, beacons):\nhttps://www.issfanclub.com/frequencies\n\nAMSAT members at NASA Goddard should be able to answer additional questions.\n\nGreg, w9gb\n— EOM —\n===\nDate: Tue, 8 May 2018 16:30:18 +1200\nFrom: \"Wendy and Terry Osborne\"\nTo: \"John Mac\",  \"Glenn Little WB4UIV\"\nSubject: Re: [amsat-bb] NASA Helical Antenna Question\n\nHi,\nYes, it's an 8 turn helix with a Gamma match (50 ohms to 120 ohms).\nThe advantages of ring reflector are in an IEEE Transactions paper \nsomewhere. (about 25 years ago?).\nNot sure what the VHF 1 and VHF 2 frequencies are but if they are more than \na few MHz apart, that would explain the use of a helix\nrather than a crossed yagi antenna.\n\nThe other picture (existingvhf.jpg) on the web page shows a 4 crossed yagi \narray with rotators.\n73,\nTerry Osborne ZL2BAC\n\n",
    "attachments": []
}