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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/46S2FUFZWNZQCJH6PN7R7P6TAWERH5C7/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "2173A991EB664419AF540DA6427479A3@WA4SCA",
    "message_id_hash": "46S2FUFZWNZQCJH6PN7R7P6TAWERH5C7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IOMFIFQQHDYS6T5VJY5OE7HJIANKJPM6/?format=api",
    "sender": {
        "address": "APBIDDLE (a) UNITED.NET",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Alan P. Biddle",
    "subject": "[amsat-bb] Re: UHF antenna help",
    "date": "2010-11-30T14:08:06Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IOMFIFQQHDYS6T5VJY5OE7HJIANKJPM6/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Larry,\n\nA couple of others things to check after working through all the other great\nsuggestions.  \n\nYou did not mention how you moved it.  Assuming you only broke it down to\nthe boom sections, are the various phasing cables still good?  There are a\ncouple of places where you have to pull them very tight, and with a sharp\nbend, to get them to fit.  Those could use checking.  As someone else noted,\nthe SWR is not that high, and if one of those were broken, I would expect\nthings to be more obvious.\n\nThe other area to check is the aluminum blocks which are the folded dipole\nfeeds.  About two years ago, I noticed that rear driven element was slightly\nbut obviously crooked.  The SWR measured by my Bird was about 1.8:1.  I\nbrought it inside and opened the aluminum box.  Sure enough, that was the\nproblem.  One of the connections was loose, and the element was not\ninternally supported or connected.  (Best theory is a bird flew into it.  I\nhave had 2 other such incidents over the years, complete with blood and\nfeathers, and in one case a dead hawk.)  However, what surprised and\nappalled me was that the broken connection was a solder bridge, and a very\nobvious one!  We are talking something which even MFJ \"quality control\"\nwould reject.  However, it would have been possible for the mechanical\nconnection to be good, with the electrical connection still bad.  I am\nthinking there is a possibility, slight though it is, that yours might have\ngotten bumped in transport.  It is not robust at all.  I repaired the\nconnection better than new, and all is well.  The next time I take down the\nantennas, I will crack them all open and check.\n\nSomething to check if all the probable stuff fails.\n\n73s es gud luck!\n\nAlan\nWA4SCA\n\n\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",
    "attachments": []
}