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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/D632BXI7Z2DFYGVHLEU66FSPXWBWQW3H/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "88033B05DAF846F09584883DC4944D93@parents",
    "message_id_hash": "D632BXI7Z2DFYGVHLEU66FSPXWBWQW3H",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ILSTSYI4KBWSQ6OKX5P362XEMWAJOXWW/?format=api",
    "sender": {
        "address": "ka3hsw (a) att.net",
        "mailman_id": "afface7d7e8049fda539552165bdde78",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/afface7d7e8049fda539552165bdde78/emails/?format=api"
    },
    "sender_name": "George Henry",
    "subject": "[amsat-bb] Re: HF satellite?",
    "date": "2009-06-07T17:35:28Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/T3VZHKCQLD3D2VGRJ27YXTXKX74GO6UB/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "I have no experience in building one either, but I would think that the 10.7 \nMHz IF of a typical FM receiver, designed to feed a 455 KHz 2nd IF, would \ngive ample bandwidth.  Follow it with a 100KHz filter, mix with a 14.2xxx \nLO, into your 24 MHz PA, and you've got a transponder.\n\nI think...\n\n\nGeorge, KA3HSW\n\n\n----- Original Message ----- \nFrom: \"David Giles\" <[email protected]>\nTo: <[email protected]>; \"Amsat-Bb@Amsat. Org\" <[email protected]>\nSent: Saturday, June 06, 2009 5:50 PM\nSubject: [amsat-bb] Re: HF satellite?\n\n\n> Hello Bob and others,\n>\n> Just to get the ball rolling on what you require for the 10m/12m\n> transponder.  I have no experience in building anything like this, just\n> a lot of questions buzzing around.\n>\n> What are the maximum physical sizes?\n> What is the power supply voltage and maximum current?\n> Does it need a beacon, be it a keyed input or even a continuous carrier?\n> Can it use any sections of the #2 transponder? e.g. an IF output from\n> the 29MHz section.  Or will they just share an antenna?\n> How much bandwidth should it be?  Can it be based on a ceramic filter\n> e.g. 50kHz at 4.5MHz from a TV or 25kHz at 45MHz used in FM radios.\n> What is the expected 12m power output?\n> Are there any link budget calculations?\n> Is there any segment of the 12m band that will be better suited?  In VK\n> SSB is recommended from 24.930-24.990MHz\n>\n> 73 de David VK5DG\n>\n\n",
    "attachments": []
}