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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FVPDK6VQYBL45KOPFW45GNX3JRWPKUGO/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "FVPDK6VQYBL45KOPFW45GNX3JRWPKUGO",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FVPDK6VQYBL45KOPFW45GNX3JRWPKUGO/",
    "sender": {
        "address": "hartzell (a) gmail.com",
        "mailman_id": "11e371d6dacd43b7a2b3a3c751e6641e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/11e371d6dacd43b7a2b3a3c751e6641e/emails/"
    },
    "sender_name": "Dave hartzell",
    "subject": "[amsat-bb] Re: Redundant geostaionary birds?",
    "date": "2007-01-30T00:04:16Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "It looks like the commonly adopted block conversion for C-band\ntransponders wouldn't land in our bands.  There seems to be a delta\nfor 2.2 GHz for the block conversion (e.g. 5.9 GHz up, 3.7 GHz down).\nWe'd need more like a 4 GHz conversion to land in our S-band, given a\n5.8 GHz uplink.  I'm sure the filters aren't quite tuned to go below\nout of band, either.\n\nAnother issue I just realized is that these transponders use polarized\nsignals (left, right, vertical, horizontal, polka-dotted)....this\nagain makes using an old communications sat a bit more difficult (but\nnot impossible) for us hams.\n\nLooks like this was not meant to be!\n\n73,\n\nDave\nNøTGD\n\n\nOn 1/28/07, Karl Bullock <[email protected]> wrote:\n>\n> Dave hartzell wrote:\n> > 3) Most of the uplink freq's are in the 5.9 GHz range (out of our\n> > allocation) and downlink in the 3.7 GHz range, again, (out of our\n> > allocation).\n> >\n> That may be _the_ problem.  I don't know the current capabilities of\n> these birds, and if they have any capability of either \"retuning\" to a\n> close amateur band, or if there are other assets on board, but inability\n> to transmit/receive on one of our bands would probably make this a non\n> sequitur.  Those with more intimate knowledge of current flying\n> technology would need to speak to this.\n\n",
    "attachments": []
}