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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/65ZEGPCJM7MC3ED3RQVD4TEOWYWVHKGS/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000901c761d6$fa3c4d20$4101a8c0@D6Z67P91",
    "message_id_hash": "65ZEGPCJM7MC3ED3RQVD4TEOWYWVHKGS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YDP3LSYECVHELUHL6LMGH7IU2KRRX3HQ/?format=api",
    "sender": {
        "address": "k4shf (a) k4shf.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Tim Tapio",
    "subject": "[amsat-bb] Re: Station not coming together - the full post\t(sorryfor repost, reply to this)",
    "date": "2007-03-08T23:10:34Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QY2ZXE3DGNWJW75UVNJXPPQH2XWXMOY3/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Very nice to read this material on the bb....brings back some of the\nexcitement of building a first station.....\n\n73 de Tim, K4SHF\n \n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Jonny 290\nSent: Wednesday, March 07, 2007 7:16 PM\nTo: [email protected]\nSubject: [amsat-bb] Re: Station not coming together - the full post\n(sorryfor repost, reply to this)\n\nYeah, I think the next paycheck's fun money is going to an AMSAT membership\nand a stack of 1/4\" aluminum rod, heh!\n\nI'm designing the beam on paper, and as per your suggestion, I'm attempting\nit with a single beam. So far, it looks great - folded dipole element, about\n11db forward gain, exactly 50 ohms impedance, great bandwidth and at 30\ndegrees elevation, the horizon is 1.5db off peak response, and the -10db\nresponse on the upper side should be around 75 degrees.\n\nI recall that satellites spend only an infinitesimal amount of time above 75\nor 80 degrees elevation, and though it'd be ironic that I'd lose the\nsatellite directly overhead, when it's at lowest path loss, I can deal with\nthat for 30 seconds in one out every 20 passes I work, by my estimation.\n\nIf the single one works and I want to improve upon it, it'll be trivial to\nbuild another and phase them up.\n\n\nQuestion:, for linear polarized antennas, am I going to see any benefit by\norienting it any particular direction? I ask because I remember that\nhorizontally polarized signals 'bend' a little bit more over the horizon,\nthough admittedly this effect will be very small at 435 MHz; I also believe\nmost man-made noise is vertically polarized, so I'm thinking that keeping it\nhorizontal would be the best course of action.\n\nShould I go Arrow-style and design a 3 element 2 meter beam at right angles\nto the 435 beam? If the more important 70cm antenna is horizontal, this\nwould put the 2 meter beam vertical - and even though it'll be at a 30\ndegree elevation, that would give the uplink antenna a little bit of\n'downtime' utility as an FM simplex antenna.  That's a very minor issue, but\nI like to lay it all out as it zips through my head - due to my QTH\nconstraints, antennas that can do 'double duty' are especially valuable to\nme.\n\nI suppose I could just buy an Arrow....but that's the easy way out (not that\nthose aren't great antennas!)\n\nThe Yaesu 817 is a great radio, but I am an irrational brand loyalist for\nsome reason, and I can't help but be obsessed with Icom gear. My big\ndecision is \"435 downconverter or Icom 706mkiig\" this spring. The\ndownconverter would come about $700 earlier, but the 706 would give me the\nall-important all-mode 70cm receive as well as 70cm all mode transmit if I\nwant to play with VO-52 or AO-7 in B, etc. My 735 is a hot radio and I\nbelieve it'd work very well with the downconverter and an ARR preamp, but\nthe 706 is very tempting.\n\nIf the IC-703 had 70cm coverage, I'd have picked one up three months ago.\nIt'd be perfect for this application - I wish they'd realize that and add\nit. They'd gain a lot of satellite operators with a rig you can snag for\n$450 or so - and it seems as though you can get by on 5 watts usually!\n\nOn the downconverter - mast mounting - good idea, bad idea? I see the upside\nof \"28 mhz cable on RG213 = good\", but the downside of \"environmental\nfactors/temperature on a crystal oscillator = bad.\" Thoughts? I'm confident\nthat I can weatherproof, but I'm mainly concerned about the temperature\nchanges.\n\nWell, I think that's all for this evening - back to antenna building :)\n\n73,\nMatt (or Jonny, whichever :) )\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",
    "attachments": []
}