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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QKPBZZY6NCMQ6G3DSTL4ENHCXQ4KWDL3/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "QKPBZZY6NCMQ6G3DSTL4ENHCXQ4KWDL3",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/43CTXJMT5OLQ3GNXNBH6ML5GAX4U537W/?format=api",
    "sender": {
        "address": "aa2tx (a) comcast.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Anthony Monteiro",
    "subject": "[amsat-bb] Re: Polarity questions",
    "date": "2008-09-21T11:46:58Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JTGNMC3T4ADX6VZGNQBHKGJKYM5BJLDX/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 02:29 AM 9/21/2008, Nate Duehr wrote:\n>...\n>I do have a question for the polarity gurus, however...\n>\n>When *transmitting* circular vs. linear polarity, are the apparent\n>losses the reverse of the numbers being used for receiving?  I am\n>inclined to think that has to be true.\n>...\n>\n>How much more power has to be put into a circularly-polarized antenna\n>versus a linearly polarized one of the same gain, to have a distant\n>station receive the same signal if they're linearly polarized?\n\nHi Nate,\n\nThis is a perfectly good question, Try this:\n\nLet's say you have a horizontal RX antenna down range.\n\nAt the TX side, you have a horizontal and a vertical antenna\nand they are quadrature phased so they make circular polarization.\n\nNow your tx can put out 100 watts. The 100 watts gets split equally\nbetween the horizontal and vertical antennas so you are putting 50\nwatts into the horizontal and 50 watts into the vertical.\n\nThe RX antenna down range doesn't know you are sending circular!\nSince it is horizontal, it only responds to the horizontal signal.\nIt doesn't even see the vertical signal and it couldn't care less\nabout the phasing. It sees the 50 watts you put into the horizontal\nantenna. The 50 watts you put into the vertical antenna is just wasted.\n\nNow imagine you disconnect the vertical TX antenna and put all\n100 watts into just the horizontal antenna. Now the RX antenna down\nrange sees the 100 watts you put into the horizontal antenna versus\nthe 50 watts you did before so you are up 3dB.\n\nSo, circular to linear, you wasted half your power and you lose 3dB.\n\nAny good?\n\n73,\nTony AA2TX\n\n\n",
    "attachments": []
}