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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/26ABACNIXP6KG2QSIBGNUT7RVH46J5F2/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "CA+neSsa+xLx5fd969HOEh4+Z4Ci9-UeJUw2dXzRr1=EV1Og=AQ@mail.gmail.com",
    "message_id_hash": "26ABACNIXP6KG2QSIBGNUT7RVH46J5F2",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/26ABACNIXP6KG2QSIBGNUT7RVH46J5F2/",
    "sender": {
        "address": "jkopala (a) gmail.com",
        "mailman_id": "083d74d034614b08876fb7affa0a2348",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/083d74d034614b08876fb7affa0a2348/emails/"
    },
    "sender_name": "John Kopala",
    "subject": "Re: [amsat-bb] AMSAT-BB Digest, Vol 14, Issue 368",
    "date": "2019-10-08T04:01:30Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "   Re: Counterbalance weight on antenna rotator? (Bob Hammond)\n\nMy antennas are mostly \"center\" mounted because of their length and are\npretty well balanced as a result.  For antennas rear mounted to the cross\nboom, a length of tubing extending in the opposite direction from the\nantennas could be used with an adjustable weight that can be positioned to\nachieve the correct balance.  The idea of a counter balance weight is\ninteresting, but the antennas present a variable load depending upon the\nelevation.  The weight on the cable presents a constant load independent of\nthe elevation.  Worse yet, I use a flip mode tracking that resolves the\nissue of having the satellite path cross the stops of the azimuth rotor and\nhaving to rotate the antennas 360 degrees to continue tracking the\nsatellite.  But this requires 180 degree movement of the elevation rotor.\nThe weight on a cable would then add to the weight of the antennas which\nwould make the problem worse and make the elevation rotor work twice as\nhard.  See a picture of my home satellite installation on qrz.com by\nlooking up N7JK.  Using an opposing counterbalance weight mounted opposite\nthe antennas can essentially change the function of the elevation rotor to\nbeing simply a positioning device if the array is properly balanced.\nJohn Kopala\nN7JK\n----------------------------------------------------------------------\n\nMessage: 1\nDate: Sat, 5 Oct 2019 10:28:21 -0700\nFrom: Bob Hammond <[email protected]>\nTo: [email protected]\nSubject: Re: [amsat-bb] Counterbalance weight on antenna rotator?\nMessage-ID:\n        <CAKoB7OraohpJPFc1rQdu5_mxsY7jzAQAS7BBn7MJwjrkvR23VQ@mail.gmail.com>\nContent-Type: text/plain; charset=\"UTF-8\"\n\nWhat do all think of this idea?  Pictured is a trial weight (20 lbs).  I\nenvision using stainless steel cable instead of the nylon rope for security\nand safety.  As the antenna crossboom is rotated, the rope unwinds.\n\nBob\nW7OTJ\n:56 AM Bob Hammond <[email protected]> wrote:\n\n> Do a lot of you, or all, use a counterbalance weight on your elevation\n> rotor?  If so, how did you implement it?\n>\n> I have 3 antennas (2M, 70cm, 23cm) on my cross boom and want to reduce the\n> load on the Yaesu rotor so it lasts longer.\n>\n> 73s,\n>\n> Bob\n> W7OTJ\n>\n",
    "attachments": []
}