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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UKPQG3RJXQIYKBSZKYLADY3XYMHILSJU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "30296461.172821191413288361.JavaMail.servlet@perfora",
    "message_id_hash": "UKPQG3RJXQIYKBSZKYLADY3XYMHILSJU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/UKPQG3RJXQIYKBSZKYLADY3XYMHILSJU/?format=api",
    "sender": {
        "address": "eric (a) christensenplace.us",
        "mailman_id": "568dec94534e4a5aa7ef764bcf8ca8d4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/568dec94534e4a5aa7ef764bcf8ca8d4/emails/?format=api"
    },
    "sender_name": "Eric H Christensen",
    "subject": "[amsat-bb] Re: SUD (Small Ugly Dish)",
    "date": "2007-10-03T12:08:08Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Sil,\nI look to Robert W0LMD (and others) for information on patch feeds.  You may want to check out http://www.ultimatecharger.com/dish.html to see some projects that were done on the larger dishes.\n\n73s,\nEric W4OTN\n\n\n>Eric,\n>\n>I've googled and looked in more traditional places for generalised \n>design data for patch antennas but come up empty handed. If you can \n>suggest anywhere I might find some engineering design guides I'd be very \n>happy. I want to build some for various frequencies, not just 2,4 GHz.\n>\n>Thanks\n>\n>Sil\n>\n>\n>Eric H. Christensen wrote:\n>> Thanks Bob.  I figured as much but I thought I'd ask.  I'm going to try\n>> to set it up for S-band operation.  I'm going to try to build a patch\n>> from ordinary items from around the house.  Maybe I can document it and\n>> show others how to build their own setup to help demystify 2.4GHz.\n>> \n>> \n>> 73s,\n>> Eric Christensen, W4OTN\n>> AMSAT Area Coordinator - Southeastern Virginia USA\n>> AMSAT Member 35360\n>> http://www.ericsatcom.net\n>> \n>> Donate to the Eagle Fund - \n>http://www.amsat-na.com/donation.php?donate=eagle\n>> \n>> \n>> \n>> Bob Bruninga wrote:\n>> \n>>>>Back to my \"new\" [18\"] dish...  Being that it \n>>>>is an offset dish, is 1.2GHz possible with \n>>>>this dish?  \n>>>\n>>>No.\n>>>\n>>>\n>>>>Anyone tried this?\n>>>\n>>>Yes.  I tried it for our satellite labs for students and althogh I get about \n>14 dB or so measured gain with it at 2.4 GHz, at 1.2 GHz, it was nothing more \n>than a big piece of metal giving no more gain than a flat reflector... maybe \n>between 3 to 6 dB.  \n>>>\n>>>See the photo of its use at 2.4 GHz on the top of this page:\n>>>\n>>>http://www.ew.usna.edu/~bruninga/ea467.html\n>>>\n>>>With the antenna for one of those $75 wireless camera receivers at the focal \n>point, and the companion little wireless camera as a signal source a mile away \n>with only its 1.5\" whip antenna, we receive the picture perfectly with a \n>margin of at least 16 dB.  This means the picture would still be good out to \n>maybe 6 miles...\n>>>\n>>>It sure is an easy way to get into Amateur TV.  Even though it does not even \n>require a license..\n>>>\n>>>But if there are wireless LANS around, then the picture gets lots of QRM..\n>>>\n>>>Bob, Wb4APR\n>>>\n>> \n>> \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",
    "attachments": []
}