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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HNCV5NPT6G3W2TMAL6XVKEWIX5COUO6V/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "F2248B47506E4508A15F21AFF6A80601@WA4SCA",
    "message_id_hash": "HNCV5NPT6G3W2TMAL6XVKEWIX5COUO6V",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/AQADUCXA5DV6G4LRT3WP7ZEHJSDEBMTX/",
    "sender": {
        "address": "APBIDDLE (a) UNITED.NET",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Alan P. Biddle",
    "subject": "[amsat-bb]  ISS: L band repeater 1354 UTC pass over SE US",
    "date": "2009-01-02T14:54:31Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RL7FYNULYIITTOLIMH7QG43N6UDHIXYA/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P4DQLSEQUY6T6EVJP3XIC5BFHTRSPBWU/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Morning,\n\n>From a technical standpoint, had the best pass ever here.  AOS at 295\ndegrees, 12 degrees elevation, slant range 1000 miles (1600 km).  LOS at 150\ndegrees, 6 degrees elevation, 1570 miles (2500 km).  Both are at or near my\nlocal horizon.  This pass was qualitatively different in that I did not\nnotice a single dropout, and it required modest power even at extreme range.\n100-200 watts ERP compared with the 2500 needed on some passes.\n\nOne thing I did was recheck the deviation of my transmitter yesterday.  I\nhad noticed in previous passes that when I spoke, I would _sometimes_ lose\nthe downlink, and it came back when I stopped.  That is indicative of over\ndeviation, and/or a really marginal signal at the ISS.  I had set the\ndeviation years ago at 3.2 KHz, and have gotten nothing but good reports on\nterrestrial and satellite communications.  Rechecking, I found that it had\ndrifted up to 3.8 KHz.  That is well within normal parameters, but I dialed\nit back to 3.2 KHz again.  I did not have time to do any A/B testing, but at\nleast what I did was not harmful.\n\n>From a communication standpoint, not so much.  I did hear someone else bring\nup the repeater, and caught \"N5???\" twice, but each time the repeater\ndropped after the first two syllables.  N5UXT???\n\nI have a couple of things to test should they do this again.  My lessons\nlearned are that: \n\n(a) You MUST be on frequency, much closer than when operating through normal\nsatellite repeaters.  The usual manual tuning just does not work in\npractice.  It is good to check the actual mode L output, however you get\nthere, since 2-3 KHz error is critical.  My TX transverter has a few KHz\nerror in the LO, but I just put the measured numbers into SATPC32, and it\ndoes the correct tuning for me.\n\n(b) Your deviation needs to be optimum, with less being better than more.\n\n(c) You need significantly more power than the usual mode UV or VU, but not\nunreasonable ERP.\n\nThanks to NASA and the ARISS team.  Lets do it again sometime.\n\nAlan\nWA4SCA\n\n\n\n\n",
    "attachments": []
}