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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NI6GWAEJE4GP5GE4UWUW6Y76OQIJHU5T/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "NI6GWAEJE4GP5GE4UWUW6Y76OQIJHU5T",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/43CTXJMT5OLQ3GNXNBH6ML5GAX4U537W/?format=api",
    "sender": {
        "address": "nate (a) natetech.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Nate Duehr",
    "subject": "[amsat-bb] Re: Polarity questions",
    "date": "2008-09-20T06:56:56Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/43CTXJMT5OLQ3GNXNBH6ML5GAX4U537W/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VNSQXGFRRLIUEHBI4ASNYC5FMSYGJWZL/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KWVWQB4VAITVGYIC62TBRS6WA4OEAUD4/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "\nOn Sep 19, 2008, at 11:24 PM, Tony Langdon wrote:\n\n> At 09:23 AM 9/20/2008, [email protected] wrote:\n>\n>> I don't-at-all disagree with the concept that working AO-27, AO-51\n>> and SO-50 isn't terribly difficult with a handheld station. Frankly,\n>> that has really (and pleasantly) surprised me. However, I do believe\n>> that adjusting polarity when hand-holding the Arrow provides\n>> improved performance during many passes.\n>\n> It makes a big difference in many cases.\n\n\nI'm kinda sitting here chuckling that people have \"opinions\" on how  \nphysics works.  :-)\n\nTony's right: Of course polarity makes a difference.  It's well proven  \nphysical science at this point in our RF history.\n\nWhen the physics don't match the real-world experience, look for  \nvariables that might be affecting the test.\n\nFor example, most FM receivers aren't linear in their response from  \n\"noisy\" to \"quieting\" on weak-signals.\n\nIf the satellite is moving, rotating, and generally \"messing up\" the  \ntest, it's hard to always see the results of polarity changes -- mix  \nin trying to do it by hand, and different people's tolerance for  \nlistening through noise, different receiver sensitivities, higher and  \nlower gain antennas, and pretty soon -- the whole test is pretty non- \nobjective.\n\nSome people may say \"not switching polarity works fine\" and on a  \nparticular day, with a particular rig, antenna, satellite orientation  \nor motion, and a different set of between the ears DSP filters (ears)  \nthan the next person, their perception may be accurate for their  \nexperience -- but it doesn't change the physics... 20 dB loss is still  \n20 dB of loss due to a polarity mismatch.\n\nThis is just the difference between the practice of radio  \ncommunications, and the hard science of it all...\n\n--\nNate Duehr, WY0X\[email protected]\n",
    "attachments": []
}