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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/AG45TH5LJZEAHIHSGDGSCJUSPRLHPXQQ/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "AG45TH5LJZEAHIHSGDGSCJUSPRLHPXQQ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HGP5T6QCUVJZFAS2MKB7UR4XMT22GX7Q/",
    "sender": {
        "address": "K3IO (a) verizon.net",
        "mailman_id": "79a9b3ddaa4b44baae47f92374974ac4",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/79a9b3ddaa4b44baae47f92374974ac4/emails/"
    },
    "sender_name": "Tom Clark, K3IO",
    "subject": "[eagle] Re: 2 Meter amplifier",
    "date": "2006-08-18T22:52:35Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QSSPG74E4WQUN3TATBI6LLKRPUWGQ4KL/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZWTFHWT4SOEZEHCWHEK4QWZMHE6ACZVR/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Robert McGwier wrote:\n> Apologies.   I know CREE is a leading company in GaN and I leaped \n> without being careful.  This is SiC technology.\n>\n> Bob\n>\n>   \nWe shall forever remember that Bob's GAN was [sic]'d (see\nhttp://en.wikipedia.org/wiki/Sic) :-D .\n\nSeriously -- this looks great.  I hope Marc can get a hardware version\nrunning soon. I am very impressed with the nearly parabolic Po vs Vd\ncurve (fig 5). This sez to me that the \"plate\" source impedance is quite\nconstant vs Vd, which in turn makes the HELAPS \"plate modulation\"\napplication even easier.\n\n>From Fig 3, I gather that the predicted 3rd harmonic is more than 70 dB\nbelow the fundamental. This is good because the 3rd harmonic of 145.x\ndownlink is pretty close to the 435.y MHz uplink, and the fewer filters\nthat are needed, the better! I wonder if perhaps some of the C5,5,7,8\ncapacitors could be open circuit ¼-wave @ 70 cm coax stubs to improve\nthe isolation even more?\n\nI'd like to suggest that the EAGLE Class-E \"phase\" PA be 3 \"parallel\"\nseparate stages differing in phase by 120º, each feeding a separate\ndipole (which are physically oriented at 120º on the +Z antenna farm),\nrunning at Vd in the 15-25V range. This would afford 3x redundancy\n(remember how the AO-40 2M amplifier death was a single-point failure),\nand also puts the total PA DC efficiency > 90% (see Table I), and also\nsaves the power losses in a 3-way high power divider. My gut feeling is\nthat, for the relatively narrow signal bandwidth, all the amplifiers can\nshare the same \"plate\" modulator.\n\nNice work, Marc!\n\n",
    "attachments": []
}