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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IH7QSBJVGYMJJMIUSP7K7DP32YDP4GE5/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "IH7QSBJVGYMJJMIUSP7K7DP32YDP4GE5",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IH7QSBJVGYMJJMIUSP7K7DP32YDP4GE5/?format=api",
    "sender": {
        "address": "oz1my (a) privat.dk",
        "mailman_id": "b2f56900318d4d1193159750f39aa3fe",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/b2f56900318d4d1193159750f39aa3fe/emails/?format=api"
    },
    "sender_name": "OZ1MY",
    "subject": "[amsat-bb] Re: 70cm Yagi and AO-51",
    "date": "2008-01-01T17:08:02Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3IRKYL6BCHKGZFYOQ2YDLHXDM2IF7SX3/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi again Andrew,\nComments after your text.\n73 OZ1MY\nIb\n----- Original Message ----- \nFrom: \"Andrew Rich\" <[email protected]>\nTo: \"OZ1MY\" <[email protected]>; \"Amsat-Bb@Amsat. Org\" <[email protected]>\nSent: Tuesday, January 01, 2008 4:54 PM\nSubject: Re: [amsat-bb] 70cm Yagi and AO-51\n\n\n> If I have this correct.\n>\n> 1. LHCP recieved on a RHCP can knock your signal down by some 20dB\n\nOZ1MY: In theory it will be compleately attenuatet - in practice more like\nyou say.\n\n> 2. LHCP matched with LHCP will result in a good signal.\n\nOZ1MY: Yes\n\n>\n> So how does a linear antenna equate when receiving a circular signal ?\n\nOZ1MY: In theory you loose 3 dB, which is not very much.\n\n>\n> And the other way around, a circular receiving a linear signal ?\n>\n\nOZ1MY: Same as above.\n\n>\n>\n\nBUT - all this is theory :-)\nFor AO-51 the attitude of the satellite and the antennas in combination\nare fairly stabel, 435.300 MHz RHCP and 435.150 MHz LHCP.\nSO-50 have linear antennas on both up and downlink. In spite of\nthat there can be a large difference between using RHCP and LHCP\nwhen listening to the downlink. That is one of the resons for at lot of\nus to have the possibility to switch between RHCP and LHCP.\n\nEven satellites with RHCP antennas may change polarity if the attitude of\nthe satellite is not right.\n\nI can send you an article about it if you are interested.\n\n\n> --------------------------------------------------------------------------\n--\n> Andrew Rich VK4TEC\n>\n>\n\n\n",
    "attachments": []
}