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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JV4XPBXR6U2HTZ2ZJ2PKTL3I456Q33LX/?format=api",
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    "message_id": "001901c6e22c$b6b80730$21567646@djxe18",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KMX7JNE3JKZQIQQLXOACJNQH2GA7TPG3/?format=api",
    "sender": {
        "address": "rjansson (a) cfl.rr.com",
        "mailman_id": "9b211bcd8a0642788e6dc055f3930699",
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    },
    "sender_name": "Dick Jansson-rr",
    "subject": "[eagle] Re: Proposed Eagle Antenna Arrays",
    "date": "2006-09-27T12:01:49Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KMX7JNE3JKZQIQQLXOACJNQH2GA7TPG3/?format=api",
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    "content": "Lou & Stan:\n \nThank you for your inputs on this antenna matter.\n \nOn 70cm, have you looked at a \"stacked\" patch arrangement with a\ndirector to give more gain? Stan has previously talked of such an\narrangement and it was proposed for the small Eagle design.\n \nOn 2m, how high off of the ground plane are you proposing for the\ndipoles?\n \nIn answer to Jim's question of the symmetry of the arrays w.r.t the spin\naxis, I view that as a non-problem for the RF patterns and operation.\n \nDick Jansson\n---------------------------\n <mailto:[email protected]> [email protected]\n---------------------------\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On Behalf\nOf Louis McFadin\nSent: Wednesday, 27 September, 2006 0033\nTo: AMSAT Eagle\nSubject: [eagle] Proposed Eagle Antenna Arrays\n\n\nHere is a proposal for arranging the Eagle antennas that Stan Wood and I\nworked out today. \nBy moving the 2M dipoles to the corners we have sufficient room for full\nsized elements over the ground plane. The 2M antennas should get about\n8dB.\n\nThree L band patches in cavities should give us greater than 12 dB gain.\nBy putting the S1,S2 and C band patches in hex shaped cups we maximize\nthe available space. The cup arrays can be NC machined out of a solid\nblank and therefore attain precise control of the spacing. It may also\nserve as heat a radiating device. Each patch will be circular polarized\nand fed with a single feed from it's matching amplifier.\n\nThe 70 CM Circular polarized patch should have around 6 dB gain.  We\nwill look at getting more gain on 70 cm.   Seven S1 patches will be\nmounted on top the 70CM patch. They should get about 15dB gain.\n\nTom's S2 interferometric patches are included.\n\nOmni antennas similar to that used on P3D will be required on the\nopposite side of the spacecraft.\n\nThere should also be room for the Sun Sensors on both sides of the\nspacecraft.\n\n\n\n\n\n\n\n",
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