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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DP6JDD6GIY5FMUON2P6UBY7ABXU5D5AA/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "DP6JDD6GIY5FMUON2P6UBY7ABXU5D5AA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HWEYW45UKFWM3PDQXLFSZHMVUJ7QSPUF/?format=api",
    "sender": {
        "address": "kq6ea (a) verizon.net",
        "mailman_id": "d2ef86d749ee450c8ad9ffc9f2e15cad",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d2ef86d749ee450c8ad9ffc9f2e15cad/emails/?format=api"
    },
    "sender_name": "Jim Jerzycke",
    "subject": "[amsat-bb] Re: Helical Antenna on 70 cm",
    "date": "2013-05-14T02:43:41Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NAM4EPJ57WKE4HMTB6JZKM46S63KUPYZ/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "M2 makes one, and I think Gulf Alpha antennas has one.\n\n73, Jim  KQ6EA\n\nOn 05/14/2013 02:04 AM, Rolf Krogstad wrote:\n> Thanks, Bob.\n>\n> Is there a commercial yagi available for 435 MHz which is R-L switchable?\n>\n> Rolf   NR0T\n>\n>\n> On Mon, May 13, 2013 at 8:21 PM, Bob- W7LRD <[email protected]> wrote:\n>\n>> the helix is a nice antenna...however...once wound for either RHCP or LHCP\n>> there's no going back.  So switching from R to L or L to R is out of the\n>> question.  Unless of course the chosen polarity is always compatible with\n>> the satellite in use.  Unless you have L and a R helix and switch between\n>> them, that can get a \"little\" involved.  Many times it is\n>> very convenient to be able to switch between L or R during a pass, at times\n>> it can make the contact happen.  This is of course is easy with a L/R CP\n>> yagi.  I have used a helix for L band (1.2ghz ) as well as feeds for a\n>> 2.4ghz dish.  They are a fine antenna with a fair amount of bandwidth.  For\n>> a 16+ turn helix I have used  stainless steel \"U\" channel for the center\n>> support.  If Clair, VE3NPC is listening, he's the resident helix guy.\n>> Just my opinion, your mileage may differ.\n>> 73 Bob W7LRD\n>> Seattle\n>>\n>> ------------------------------\n>> *From: *\"Rolf Krogstad\" <[email protected]>\n>> *To: *[email protected]\n>> *Sent: *Monday, May 13, 2013 9:22:57 AM\n>> *Subject: *[amsat-bb] Helical Antenna on 70 cm\n>>\n>>\n>> I am new to satellites and new to the design requirements for UHF and am\n>> looking for advice.\n>>\n>> I am looking to build a Helical antenna for the 70cm Band.  I am\n>> considering the plans for such an antenna from the 2010 edition of the ARRL\n>> Satellite Handbook.  The plans call for a 235 cm (7' 8\") long, 2.5 cm (1\")\n>> diameter center support made of either a wooden dowel which has been\n>> treated or a fiberglass tube.  It also requires multiple 7.6 cm (3\")\n>> spacers for the helical element.\n>>\n>> My question is would fiberglass rods made of \"Isophthlic Polyester Resin\"\n>> be a good choice of material at UHF frequencies?\n>> I hesitate to use treated wood because I plan to mount this on the top of a\n>> 15 meter high tower and it isn't very accessible.\n>>\n>> Thanks\n>>\n>> Rolf   NR0T\n>> [EN34]\n>> _______________________________________________\n>> Sent via [email protected]. Opinions expressed are those of the author.\n>> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n\n",
    "attachments": []
}