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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/CA65J4FYRA4WSFU6R5W7VWJMLNJRD7FQ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000801c6f755$cc0d43a0$643aa8c0@notepad8",
    "message_id_hash": "CA65J4FYRA4WSFU6R5W7VWJMLNJRD7FQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/VTIM7MKO5ZSCVNBLTPLFBSFR53ZVXQ6G/?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: L/S helix feed",
    "date": "2006-10-24T10:18:47Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VTIM7MKO5ZSCVNBLTPLFBSFR53ZVXQ6G/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Bob \n\n> I am building a dual L/S concentric helix feed for \n> a 48x54 inch primestar dish.  The reflector is cut \n> for  L band does that cause a problem with S band?  \n\nOnly if it causes a large blockage - on such a large dish, and as I think\nit's offset fed, then this is unlikely to make any noticeable difference.\nYou will probably find  more problems with ground noise from the helix\nsidelobes on S band.\n\n> Where can I find a good design for a notch filter for \n> S band to reduce desense?  \n\nI have Charlie G3WDG's filters. The 1.269GHz notch is essential in front of\nthe DB6NT S band front ends that have no notch: you will fry it otherwise.\n\nOn the other hand, with the AIDC3731's ISTR that W0LMD documented these at a\nsymposium a few years ago as having very deep OOB filters and no 23cm\nfiltering is generally required.\n\nThis is worth keeping in mind if noise figure is bugging you. If you have to\nput in a 0.5dB loss filter in front of a low noise 0.7dB NF front end, you\nwould be better off sticking with a 1dB NF AIDC on its own.\n\n> Where does the focal point want to be on the helicies?  \n> Or is it pretty forgiving.  Any other information is appreciated.\n\nTo within an inch you will not hear the difference at S band. Of the two, S\nband is more critical.\n\n73, Howard G6LVB\n\n",
    "attachments": []
}