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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XVGEIF7ZAPR6V3WLGTIEKFPWWH7WABGH/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "XVGEIF7ZAPR6V3WLGTIEKFPWWH7WABGH",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/WANLHULSOKS4R6GWOLY2VGKZ3OB4CGKX/?format=api",
    "sender": {
        "address": "amsat-bb (a) wd9ewk.net",
        "mailman_id": "21664df01bef4757931b7cdb42a9e768",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/21664df01bef4757931b7cdb42a9e768/emails/?format=api"
    },
    "sender_name": "Patrick STODDARD (WD9EWK/VA7EWK)",
    "subject": "[amsat-bb] Re: AO-51 Mode S Antenna question",
    "date": "2008-04-06T08:09:22Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WANLHULSOKS4R6GWOLY2VGKZ3OB4CGKX/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Ron!\n\nBy the way, thanks for the QSO this (Saturday, 5 April) afternoon\non AO-27.  I was parked SE of Flagstaff AZ, dealing with a strong\nwind while working that pass.\n\n><snipped reference to K5GNA-modded S-band downconverter>\n>\n> With this setup, can I mount the Mode S downcoverter and have a\n> reasonable chance at getting it to work or should I look at some type of\n> patch antenna to get better signal picket ?  Is mode S a little less\n> unforgiving so that I have to have it more directed at the satellite\n> than I can get away with on my current VHF/UHF antenna setup ?\n\nFor AO-51, you can receive it easily with just the dipole and corner\nreflector on that downconverter.  Some have replaced the dipole\nwith a Yagi, and you could even go with some of the 2.4 GHz WiFi\nantennas.  AO-51 is transmitting on S-band at 2 or 2.5W when it\nis there, so in a low orbit you should be able to hear it.\n\nAs for dealing with the Doppler at S-band, computer-control of\nyour downlink radio is desireable.  It *can* be done manually, but\nwith the shift of around 55 kHz +/- you are adjusting the receive\nfrequency almost all the time.  When I have worked AO-51's\nS-band downlink, I would not have the benefit of computer control\nfor my portable setup.  I would be almost constantly adjusting the\ndownlink frequency, but with 5 kHz tuning steps on my downlink\nreceiver (VX-2R connected to the downconverter) I did OK.\n\nGood luck and 73!\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\n",
    "attachments": []
}