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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QZLISKXST5GQDLRZKCRJG57QWLGDVXPQ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "QZLISKXST5GQDLRZKCRJG57QWLGDVXPQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/QZLISKXST5GQDLRZKCRJG57QWLGDVXPQ/",
    "sender": {
        "address": "8p6sm (a) anjo.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Gus",
    "subject": "[amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal",
    "date": "2013-04-16T21:52:58Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "No reason why not.  The power at each antenna will be 3 dB down, but you \nwill get an additional 3 dB of gain for using two antennas, so there \nwill be (nominally) no loss, assuming the antennas are oriented the same.\n\nOr you could orient them 90 degrees apart, use an electrical 1/4 wave \nmatching section of 75 ohm coax on each antenna, plus an electrical 1/4 \nwave phasing section of 50 ohm coax on ONE antenna, and you have CP \nradiation.  Use a double-throw relay to switch the phasing section from \none antenna to the next, and you have switchable RHCP/LHCP.  In this \ncase you WILL suffer a 3 dB penalty when working signals with linear \npolarization.\n\nAnother possibility I want to try some day:  use a radio with diversity \nreception (like IC-2820).  Connect one horizontal antenna and one \nvertical.  No matching or phasing, no manual switching of circularity.  \nJust let the receiver decide which antenna is pulling in the strongest \nsignal on a moment by moment basis.  Tx polarity is fixed, but you can \nturn up the wick to compensate!\n\nOn 04/16/2013 02:31 PM, Douglas Phelps wrote:\n> Any reason why, using identical coax lengths, you could not transform the\n> impedance to 100 ohms and then use a T connector to sum both antenna signals and\n> achieve 50 ohms to the radio?  I know Transmit power will be 3 dB down at either\n> antenna but is there any reason it will not work?  Any antenna gurus out there?\n>\n>\n>\n>\n> ________________________________\n> From: R.T.Liddy <[email protected]>\n> To: [email protected]\n> Sent: Tue, April 16, 2013 11:46:35 AM\n> Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal\n>\n> For the Satellites, it completely doesn't matter. At any given moment,\n> you only have 1 chance in 90 that you will have matching polarization.\n>   \n> So, if you plan to use the antenna for other than Satellites, set your\n> polarization\n> for that purpose (V for FM or H for SSB/CW).\n>   \n> My plan is to install 2 Elk antennas, one V and one H. Then, have a relay that\n> I can switch between the two and choose the best downlink signal at any\n> given moment. This arrangement will also give me optimum flexibility for\n> terrestrial operation on 2 & 440.\n>   \n> Now, where can I find a relay to do that function?????\n>   \n> 73/GL,    Bob K8BL\n>\n>\n> --- On Tue, 4/16/13, Lee Maisel <[email protected]> wrote:\n>\n>\n> From: Lee Maisel <[email protected]>\n> Subject: [amsat-bb] Re: Mount an Arrow on rotator with 2m vertical or horizontal\n> To: \"Don Hoover (WS4E)\" <[email protected]>\n> Cc: [email protected]\n> Date: Tuesday, April 16, 2013, 12:24 AM\n>\n>\n> Hi Don,\n>\n> I have mine mounted with 2m elements horizontal, because that's how it\n> seems I used it most when it was handheld.\n>\n> Lee\n> W5LMM\n>\n>\n> Don Hoover (WS4E) wrote:\n>> Just wondering, should I mount my arrow with the 2m elements oriented\n>> vertical or horizontal?\n>>\n>> I am planning on putting it at 15deg and just using a az rotator.\n>>\n>> Does it even matter which way its oriented since the polarity of the sats\n>> are always changing?\n>>\n>> Maybe I should mount it like this: / instead.\n>>\n>> Just curious what some thought was the best way to go.\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>\n\n\n-- \n73, de Gus 8P6SM\nBarbados, the easternmost isle.\n\n",
    "attachments": []
}