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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/B4GNDF6W2FB4NEUPWWM3BS72LLRLJKZP/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "091920082323.26677.48D4345D0009E0970000683522243322829B0A02D2089B9A019C04040A0DBF049BCC02@att.net",
    "message_id_hash": "B4GNDF6W2FB4NEUPWWM3BS72LLRLJKZP",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VNQV3B5PKEZC7OTDLCVKESWSQ3PDZH7A/",
    "sender": {
        "address": "n3tl (a) bellsouth.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: Polarity questions",
    "date": "2008-09-19T23:23:09Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VNQV3B5PKEZC7OTDLCVKESWSQ3PDZH7A/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YGG33GXULRTOTJQBC3CQ3L6Z2LVGLOZ2/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\" ... and the polarization of the Yagi makes no difference in quality of TX/RX signal.\"\n\nI know I haven't been working the satellites nearly as long as Clint and many others - and with all due respect, my friend - I have to disagree with the above statement. I routinely work passes during which I swing my Arrow through, and sometimes beyond, 90 degrees to maintain signal quality. There also have been times when a quick twist of the wrist has made the difference between making a contact and getting a new grid square ... and not. \n\nI don't-at-all disagree with the concept that working AO-27, AO-51 and SO-50 isn't terribly difficult with a handheld station. Frankly, that has really (and pleasantly) surprised me. However, I do believe that adjusting polarity when hand-holding the Arrow provides improved performance during many passes. \n\n73 to all,\n\nTim\n\n-------------- Original message from Clint Bradford <[email protected]>: -------------- \n\n\n> >>...20-dB, assuming the signal is pure circular \n> polarization...linear, then -3 dB...difference between RHCP and LHCP \n> is 20 dB...difference between Horizontal and Vertical Linear is 20 \n> dB...difference between (RHCP or LHCP) and (Horizontal or Vertical) is \n> 3 dB...the VHF/UHF Manual handbook says 20 -30dB...in the real world, \n> expect around 20~25dB loss from being completely cross- \n> polarized...Between linear and circular, expect about 3dB loss... \n> \n> Ahh, thank goodness for the engineers... \n> \n> Just know that to get started working the FM satellites, you do not \n> need to spend much to make successful contacts...Working AO-51 from \n> Southern California (which some claim is not a \"real world\") at a Watt \n> or so with an HT and Arrow Antenna is a breeze, and the polarization \n> of the Yagi makes no difference in quality of TX/RX signal. \n> \n> And as you refine your satellite comms requirements, you can spend \n> more money! \n> \n> Clint Bradford, K6LCS \n> 909-241-7666 \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",
    "attachments": []
}