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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/BYQL3UA77KQPMF2IEUB3UZUMLLOT5I2L/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "BYQL3UA77KQPMF2IEUB3UZUMLLOT5I2L",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/BYQL3UA77KQPMF2IEUB3UZUMLLOT5I2L/?format=api",
    "sender": {
        "address": "jim (a) k6ccc.org",
        "mailman_id": "bbef5a4ab75c469480d488c236da0616",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bbef5a4ab75c469480d488c236da0616/emails/?format=api"
    },
    "sender_name": "[email protected]",
    "subject": "[AMSAT-BB] Re: Telemetry antenna suggestion",
    "date": "2022-05-03T15:10:42Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Graham Shirville said:\n> As part of the FUNcube mission team, I can absolutely confirm that it is \n> possible to receive and decode telemetry signals from EO88/Nayif-1 with \n> an omni antenna. Presently AO-73/FUNcube-1 is running only low power \n> telemetry around 30 mW) so is more difficult.\n\nAs I said, this was APRS on NO-44 about 20 years ago.\n\n> With Nayif you should see upwards of 90 packets received on each good \n> near-overhead pass. The FUNcube system was specifically designed for the \n> telemetry to be easily received at schools and colleges using only \n> simple equipment.\n\nI have made no attempt to do anything with satellites since about 2005 (house issues).  Hope to be back within the next year.\n\n> The antennas that we use are generally turnstiles. AMSAT-UK used to hold \n> these in stock but, sadly, supply difficulties have made that impossible \n> for the time being.\n\nI tried several antennas including turnstiles, quadrafiller, and simple 1/4 wave verticals.\n\n> The possible problems that you may have could be:\n\n>   Locally high levels of wide band noise...often the case in urban areas\n\nVery likely.  I am in the Los Angeles basin, so RF noise levels are high.\n\n>     A receiver/SDR dongle that does not have sufficient filtering to \n> reject out of band cross modulation etc (The FUNcube Dongle is very good \n> in this respect)\n\nI was using a Midland commercial 2-way radio both with and without a SSB pre-amp at the antenna.\nThis was years before anyone had SDR receivers.\n\n>    Excessive signal loss in the coax - a filtered preamp will solve this.\n\nAll of 25 feet of LMR-400 at 2 meters\n\n>     A poor antenna!\n\nReportedly some of the best non-directional satellites antennas at the time.  When I used my AO-10 class antennas, it worked great.\n\n73\n-----\nJim Walls - K6CCC\[email protected]\n\n\n",
    "attachments": []
}