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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VIWUM4K6YIVT25D2DEBQEI7DE7REDHFU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000101c73468$782a7500$6432a8c0@notepad8",
    "message_id_hash": "VIWUM4K6YIVT25D2DEBQEI7DE7REDHFU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JC2V6CJKC3ISTPNJHHPAF6AWRHFMJLZM/?format=api",
    "sender": {
        "address": "howard (a) howardlong.com",
        "mailman_id": "82a1d3d58c6f48898b755d208f81930e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/82a1d3d58c6f48898b755d208f81930e/emails/?format=api"
    },
    "sender_name": "Howard Long",
    "subject": "[amsat-bb] Re: Crossbooms ... my pennyworth.",
    "date": "2007-01-10T03:36:09Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JC2V6CJKC3ISTPNJHHPAF6AWRHFMJLZM/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FC6C6XJP3OP45A3NMRYZD7U4EO6M4R7G/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi John\n\nFirstly, I am so glad to hear from you on the BB after a long time.\n\n> In my humble opinion, on LEO's the squint experienced just doesn't \n> warrant the effort of being (theoretically) correct. It did make a\n'slight' \n> difference on AO-10 and AO-13 (HEO's) but still hardly worth the effort of\n\n> being \n> \"technically correct\".\n>\n> Others may have a different opinion ... which of course, they have evey \n> right to have.\n\nNo, I am sorry but I have to _agree_ with you! There is some time spent on\nsquint in the bible (Martin Davidoff's superb Radio Amateur's Satellite\nHandbook and previously known as the Satellite Experimenter's Handbook).\n\nWhat's not discussed extensively is the differences operating-wise between\nLEO and HEO for this phenomenon.\n\nIn practice, squint presents itself on LEOs differently to HEOs. Squint on\namateur LEOs is very temporary and can largely be corrected, during a pass,\nby changing polarisation (H,V and/or R,L) on the fly by the operator. For\nHEOs, due to the increased distance and longer term power and attitude\nconstraints, squint is usually an issue to do with the long term positioning\non the satellite's downlink antenna in relation to the Earth, and unless\nyou're a command station, and the HEO's power budget is good, you can't fix\nthat from the ground.\n\nFor a couple of years prior to AO-40 when only LEO's (plus a tiny bit of\nAO-10) were running, I ran for a year or so a pair of Arrows phased on a 6'\ncross boom. I spent _many_ evenings messing about placing all the elements\nof the 70cm on one boom and all of those of the 2m on another boom but I\ncould ever get a great match, particularly on 70cm. So I resorted to making\ncircular polarisation work with the 2m and 70cm planes separated, and remote\npreamps and remote polarisation switches.\n\nThis worked _very_ well, and the gain you achieve by being able to manually\nswitch polarisation during a null when working LEO's cannot be over\nemphasised IMHO.\n\nOne final point, radio amateurs have been doing antenna diversity for a very\nlong time.\n\n73, Howard G6LVB\n\n",
    "attachments": []
}