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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MTKRVU5AEKHWRF37NGM3NBWDAX2BFIEE/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "MTKRVU5AEKHWRF37NGM3NBWDAX2BFIEE",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MTKRVU5AEKHWRF37NGM3NBWDAX2BFIEE/?format=api",
    "sender": {
        "address": "gary_mayfield (a) hotmail.com",
        "mailman_id": "fe442cdc520e4857a9168b9182091295",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/fe442cdc520e4857a9168b9182091295/emails/?format=api"
    },
    "sender_name": "Gary \"Joe\" Mayfield",
    "subject": "[amsat-bb] Re: UHF antenna help",
    "date": "2010-12-01T00:58:18Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TMRHOQZ6CZ75YOCBSOTTEPQRZPNGXDI2/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Larry,\n\n   Congrats on the move!  What follows is personal experience and may not be\nthe same for everyone.  I have had very poor luck looping the coax out the\nback of the antenna.  I believe it is because I wound up with a conductor\n\"flapping\" around in the breeze close to the antenna yielding unpredictable\nresults.  What has worked best for me is to run the coax back down the boom\nof the antenna and then away from the antenna (at a right angle) at the\ncrossboom.  This only seems to work with the antenna in the \"X\" patern and\nfails miserably in the \"+\" pattern.  There are also places along the boom to\navoid when doing this (multiples of 1/2 wavelength).\n\n   Usually when I have had a problem like you are describing it has been a\nfeedline/connector issue.  It never hurts to make a complete check of that.\nI am also assuming you are rotating the \"flexible\" version of LMR-400.\n\n   The 436CP30 is a great antenna (nicer than any I've ever had), you hear\nlots of them on the birds and it should be more than enough for horizon to\nhorizon coverage.\n\n73 and Let us know what you find!\nJoe kk0sd\n\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of larry\nSent: Monday, November 29, 2010 7:14 PM\nTo: [email protected] \nSubject: [amsat-bb] UHF antenna help\n\nGood evening,\n\n   Name here is Larry, N1MIW. I recently moved to a better (higher) QTH and\nfinally got around to setting up the satellite station \"almost\" like it used\nto be, but am experiencing some reception difficulties on UHF. I'm hoping\nsomeone out here can help me diagnose what I'm doing wrong, or what the\nproblem is. I am using a Yaesu FT-847 which is computer controlled, as well\nas the Yaesu G-5400 rotator. The antennas are mounted on a solid fiberglass\nmast only ~17 feet off the ground, and fed with LMR-400. The frequencies are\ncorrect for the satellite I want to use.\n\n   My problem is with the 436CP30 antenna. I cannot seem to find good\nresults with it since my move - terrestrial or sat related. My SWR is around\n1.5:1 at 435MHz, and the polarity switch is working. I tried changing\nfeedlines and removing the pre-amp, but I still cannot seem to make it work\ncorrectly. I am trying to receive SO-50 D/L, and VO-52 U/L, but both are\njust not working like I remember it being before the move. I don't have any\nbroken or mis-aligned elements (that I noticed - I'll look again). The only\nthing I was looking into was instead of having it placed on the boom in a\n\"+\" pattern was making it an \"x\" pattern - would that make a difference? I\ndon't remember hearing or reading about that anywhere, so I was looking for\nyour opinion.\n\n   On a side note, what's your opinion of this antenna? Like I said, I used\nto have good luck with it, but I'm not sure what's different, except the new\nhome. Should I get \"horizon\" to \"horizon\" coverage (plus or minus a few\ndegrees)? Oh, I also looped the coax off the back like the manual states,\nbut the improvement is very minimal. I checked the \"jumpers\" at the tuning\nbox, and they seem OK too.\n\n   I'm running out of ideas, and any guidance would be appreciated. Thanks &\nlooking forward to working the birds again!\n\n73's... Larry N1MIW\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\n\n",
    "attachments": []
}