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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/IJKMP7DIND2L5CLKG2UTCDST5S5MKGRV/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "IJKMP7DIND2L5CLKG2UTCDST5S5MKGRV",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/IJKMP7DIND2L5CLKG2UTCDST5S5MKGRV/?format=api",
    "sender": {
        "address": "tjjapha (a) earthlink.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] FW: ARLB013 ARRL aiding effort to mitigate repeater\tinterference to military radars",
    "date": "2007-04-24T12:30:10Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DPXGWTSXOEH7XDJKMFOS3JQUL4KCC2FG/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi All,\nShould this ARRL msg. cause us to worry about the future of mode B\noperations?\n73,\nTony, N2UN\n\n\n\n> [Original Message]\n> From: ARRL Web site <[email protected]>\n> To: <[email protected]>\n> Cc: <Subscribed ARRL Members:>\n> Date: 4/24/2007 12:06:01 AM\n> Subject: ARLB013 ARRL aiding effort to mitigate repeater interference to\nmilitary radars\n>\n> SB QST @ ARL $ARLB013\n> ARLB013 ARRL aiding effort to mitigate repeater interference to \n> military radars\n>\n> ZCZC AG13\n> QST de W1AW  \n> ARRL Bulletin 13  ARLB013\n> From ARRL Headquarters  \n> Newington CT  April 23, 2007\n> To all radio amateurs \n>\n> SB QST ARL ARLB013\n> ARLB013 ARRL aiding effort to mitigate repeater interference to \n> military radars\n>\n> The ARRL has been working with the US Department of Defense to\n> develop a plan to mitigate alleged interference from 70 cm ham radio\n> repeaters to military radar systems on both coasts. Citing an\n> increasing number of interference complaints, the US Air Force has\n> asked the FCC to order dozens of repeater systems to either mitigate\n> interference to the ''PAVE PAWS'' radars in Massachusetts and\n> California or shut down. Amateur Radio is secondary to government\n> users from 420 to 450 MHz and must not interfere with primary users.\n> The Commission has not yet responded. ARRL Regulatory Information\n> Specialist Dan Henderson, N1ND, stresses that the Defense Department\n> acknowledges Amateur Radio's value in disasters and emergencies and\n> is being extremely cooperative, and a wholesale shutdown of US 70 cm\n> Amateur Radio activity is not in the offing.\n>\n> ''The ARRL Lab is working up calculations on each repeater system the\n> Air Force has identified to determine where interference-mitigation\n> techniques offer a reasonable chance of keeping the repeater on the\n> air,'' Henderson says.\n>\n> The situation affects 15 repeaters in the vicinity of Otis Air Force\n> Base on Cape Cod, Massachusetts, and more than 100 repeaters within\n> some 140 miles of Beale Air Force Base near Sacramento, California.\n>\n> A US Air Force contractor identified the problematic repeater\n> systems last summer, but the situation didn't become critical until\n> the Air Force contacted the FCC a month ago. ARRL officials met with\n> Defense Department representatives in late March to discuss alleged\n> interference to the PAVE PAWS radar sites. Henderson has contacted\n> Amateur Radio frequency coordinators in both affected areas.\n>\n> PAVE PAWS is a missile and satellite detection and tracking system,\n> and its facilities occupy essentially the entire 70 cm band -- one\n> factor that makes mitigation difficult. As a ''first step,'' however,\n> the ARRL is recommending that all affected repeater owners reduce\n> power -- possibly to as little as 5 W effective radiated power\n> (ERP).\n>\n> ''We understand the difficulty this may cause to owners and users,''\n> Henderson said, ''but the alternative to operating with a smaller\n> coverage area may be not operating at all.''\n>\n> Henderson says the League is still seeking further information on\n> the problem. ''Until the Defense Department accepts a mitigation\n> plan, repeater owners should exercise patience,'' he cautioned.\n>\n> Contact Dan Henderson, N1ND, [email protected], or 860-594-0236, with\n> specific questions or issues associated with this situation.\n> NNNN\n> /EX\n\n\n",
    "attachments": []
}