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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/R2RMB7MQGONWDQALLZDMXPDT3UHHC44W/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "R2RMB7MQGONWDQALLZDMXPDT3UHHC44W",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/XJQD5OAWRSPADLXM2OPYVVKCWMP7IYYY/",
    "sender": {
        "address": "s.wilson (a) yahoo.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "scott wilson",
    "subject": "[amsat-bb] Re: ARRL dual moxon turnstyle project questions",
    "date": "2007-08-05T14:56:27Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/S3QNWGANF6CHMYLKQLPKY2VLVX3JKV5T/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2NUBMFIADJU7LB7RF67FO7VKKLYKPQK3/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thanks very much for the feedback everyone.\n\n>From what I was reading in the articles, I was under the impression that\na circularly polarized antenna was a step above linear polarized setups\nsuch as the Arrow (or any small yagi) and verticals. In practice, I'm\nhaving somewhat better luck with the linear setup. Until Bruce Mentioned\nthe short yagi/tv rotator setup, I hadn't even considered my own similar\nsetup as an option.\n\nHere are my experiences so far:\n\nMy first attempt was with a 2m/440 mobile whip with a radial base. The\nantenna was tilted over about 30 degrees to be slightly more\nperpendicular to the predicted path of AO-51. From that pass, I could\ndefinitely tell that I was tracking a satellite, but couldn't copy\nanything that I was hearing. This was fed into my IC-7000 with about 15\nfeet of RG-8X.\n\nSecond attempt was receiving with just the 440 section of the dual moxon\nantenna system. The closest I got with that was perhaps a little less\nnoise, but definitely no copy. Obviously, that's not inheriently a\nproblem with the antenna, but likely a problem with my implementation\nwhich - which I can't really test. My antenna analyser only goes to uhf.\n\nBruce's email saying that a TV rotator and linear yagi's would be better\nthan a full blown system for a beginner contradicted what I had\nconvinced myself of - that I would be way too far down in the noise with\nthe fact that I was linear polarized and had no elevation control, and\nwith about 75' of less than stellar RG-58.\n\nIn fact, I have something usable right now on my roof: a cushcraft\n2m/440 3 el vertical yagi on a tv rotator.\n\nSo far this has the best results to date. I've been able to copy at\nleast parts of call signs on the latest AO-51 pass, and managed to get a\npretty clear copy on a couple of CW beacon passes.\n\nNow I'm considering incremental improvements.\n\nI have a length of RG-213 that's been waiting to replace the radioshack\nRG-58 feed to the yagi, so that should give me about 2dB.\n\nI am hearing that a preamp is an absolute requirement. I'm now\nresearching the best method to feed the dual yagi.\n\nIf, after that, I can get a better copy on the passes, I'll try to make\ncontact.\n\nThanks,\n\nScott NW2S\n",
    "attachments": []
}