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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/D4VLAEYJBJNNEBIPJSU2JUSNQTTFPIWZ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "D4VLAEYJBJNNEBIPJSU2JUSNQTTFPIWZ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/SG5MUL47T5HKC7YQ5HMCZEHGWNEQ56BB/?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: Terrestrial QRM to FM satellites",
    "date": "2007-09-20T16:47:22Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SG5MUL47T5HKC7YQ5HMCZEHGWNEQ56BB/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MBOH6ZZVRR6IATZOOTHQZEKJUB7RB3GD/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Bob!\n\n> Today on passes of both SO-50 and AO-27, there were\n> terrestrial QSOs going on.  It was especially bad on AO-27\n> with a few people clearly unable to get through due to the\n> strength of the QRM.  It almost sounded like there was a\n> repeater setup on 145.850 with Roger beeps happening.\n> So, what is the \"proper\" thing to do in situations like this?\n>\n> Ignore it and talk to anyone who can overpower them?\n>\n> Stay off the air and hope you can hear callsigns that you can\n> ask carefully to QSY?\n>\n> Something else?\n\nAO-27 regularly picks up non-ham transmissions from Central America\n(two-way radio and long-range cordless telephone conversations), and\nlately I've heard what sounds like hams chatting on 145.850 MHz\nsimplex not realizing they are on a satellite uplink.  Without the PL tone,\nSO-50 won't retransmit the QRM, but the QRM sometimes overpowers\nany legitimate transmissions up to the satellites.  Up to now, it seems like\nAO-51 has been free of the non-ham QRM.\n\nIn the past, the non-ham stuff from Mexico had been identified and - with\nlots of pressure - the Mexican authorities forced the taxis and Red Cross\nambulances to move their radios to other frequencies.  Unfortunately, some\nof the new frequencies were somewhere else in the 2m band, but at least\nthe satellite uplinks were free from those QRM sources.  It took a lot of work\nby some Mexican hams to find the sources of the transmissions, sending\nthe documentation to the Mexican \"FCC\", along with complaints from\noutside Mexico showing the international impact of these illegal\ntransmissions before any action was taken.\n\nWhat should you do?  If possible, record the passes that you work.  You\nnever know what you might hear, and the recording might be useful for\nsomeone trying to determine the source of the QRM.  Generally, I just\ntry to work the satellite despite the QRM.  With an HT, I might not get\nthrough all the time, but I'll still try.  If the QRM is from two hams chatting\non the satellite uplink simplex, they are not affected by your transmissions\nup to the satellite unless they are close to your location.  If it's\nfrom Central\nAmerica or Mexico, the problem generally goes away on passes where\nthe satellites are moving from south to north - moving away from the QRM.\n\nIf you hear callsigns coming through the satellite from those chatting on 2m\nsimplex, and if you can find an e-mail address for those stations, send them\na note mentioning you heard them through a satellite and politely suggesting\nthey use another frequency.  If you have a recording of the pass, send a\ncopy to them to show what you heard.  Invite them to try working the satellite,\nsince they obviously have stations that are able to transmit to the satellite\nbased on what you heard.\n\nGood luck and 73!\n\n\n\nPatrick WD9EWK/VA7EWK\nhttp://www.wd9ewk.net/\n",
    "attachments": []
}