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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EDHZGP57VWPL3QZTAQFOSNHEYGKYTJ2T/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "EDHZGP57VWPL3QZTAQFOSNHEYGKYTJ2T",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/D64REF5IZGVH66NDQUBPEORMSPFZDUOI/?format=api",
    "sender": {
        "address": "jari.koivurinne (a) virpi.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Jari",
    "subject": "[amsat-bb] Re: big dish",
    "date": "2006-10-18T15:52:35Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PLKPCJNUUKISYY62RERS2RV2MXWHIL62/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": ">\n> If you get creative and mount the feed in such a way that you can slide\n> it in towards the dish, you can select your beam width and effectively\n> gain at will by adjusting the illumination of the dish.\n\nDon't get too creative; the focus point exist only in one place.\nGain will collapse rapidly and radiation pattern gets distorted\nand that makes the dish more prone to receive interfering signals\naround. This is of course highly depending on feed system itself.\n\n(If you only\n> illuminate 4 feet of your 12 foot reflector, you should have the same\n> gain and beamwidth as the four foot dish, just with a longer focal\n> length)\n\nBetter use narrower beamwidth at the feed. (Underillumination) This will not\ndegrade the performance of the dish. Only gain will be lower but\nbeamwidth and even F/B-ratio can be increased.\nTo illuminate just 4 feet area use narrower feed like helix.\nCalculate (or guestimate) the turns needed.\nPlease read Paul's W1GHZ excellent \"Online Microwave Antenna Book\".\n\n> 73s, Jason N1XBP\n>\n73s, Jari OH3UW\n\n",
    "attachments": []
}