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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PLKPCJNUUKISYY62RERS2RV2MXWHIL62/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "PLKPCJNUUKISYY62RERS2RV2MXWHIL62",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/D64REF5IZGVH66NDQUBPEORMSPFZDUOI/?format=api",
    "sender": {
        "address": "jason (a) jason.white.name",
        "mailman_id": "064345e25d97422f8a9592d430e1f0a6",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/064345e25d97422f8a9592d430e1f0a6/emails/?format=api"
    },
    "sender_name": "Jason White",
    "subject": "[amsat-bb] Re: big dish",
    "date": "2006-10-18T13:36:09Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/D64REF5IZGVH66NDQUBPEORMSPFZDUOI/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EDHZGP57VWPL3QZTAQFOSNHEYGKYTJ2T/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "If you get creative and mount the feed in such a way that you can slide \nit in towards the dish, you can select your beam width and effectively \ngain at will by adjusting the illumination of the dish. (If you only \nilluminate 4 feet of your 12 foot reflector, you should have the same \ngain and beamwidth as the four foot dish, just with a longer focal \nlength) I used an acrylic rod about two or three feet long on a C-Band \nTVRO dish, and it saved a lot of repointing when the feed was moved \ncloser to the dish. It was also interesting to see the increase in \nsignal strength as the feed moved closer to the focal point.\n\nThe only real advantage your four foot dish has over the 12 is being \nsmaller and lighter, so it's easier to point and has less wind loading. \nIf you can mount and maneuver the 12, do that. I used a 16' dish for a \nwhile on AO-40 with excellent results.. but mounting and positioning it \nwas not a trivial task (for me at least)...Especially in my case since \nit was installed on the west coast of Florida in very sandy soil. I \ncould dismantle it for hurricanes, but I still had to plan for any \nunexpected storms when mounting it.  In the end, I found a 90cm dish \npreferable because I could position it by hand with minimal effort, not \nspend all my time repositioning, and it was also easily removed and \nstored during hurricanes. I doubt that will be as much of a problem in \nSeattle!\n\nThe only thing to remember is that some TVRO dishes have a mesh that \nisn't very good above C band, particularly the older fiberglass ones, \nbut you should be fine if you intend to use it for L/S.\n\n73s, Jason N1XBP\n\nP.S. - I wouldn't have gotten anywhere with my big dish if it wasn't for \nW0LMD's webpage:\n\nhttp://www.ultimatecharger.com/dish.html\n\n\[email protected] wrote:\n> Hello\n> I have this 12 foot dish waiting for \"something\".  I want a dual L/S dish system.  Given the beamwidth of a 12 footer would be small.  What would happen if the feed were placed at a spot other than the focal point?  I realize  I would be  not using the dish to it's full potential.  Would that broaden the beam width?  I also have a four footer which would be more applicable.  I am planning for the next HEO and retirement in six months.\n> 73 Bob W7LRD\n> Seattle\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n>\n>\n>   \n\n",
    "attachments": []
}