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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DUUETTN2UOER6ZCSUKKEXMEEAV6PK66Y/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "DUUETTN2UOER6ZCSUKKEXMEEAV6PK66Y",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/DUUETTN2UOER6ZCSUKKEXMEEAV6PK66Y/?format=api",
    "sender": {
        "address": "vu3tyg (a) yahoo.co.in",
        "mailman_id": "ffb9caab06b3489aa9d16edd32c0d3b9",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ffb9caab06b3489aa9d16edd32c0d3b9/emails/?format=api"
    },
    "sender_name": "Nitin Muttin",
    "subject": "Re: [amsat-bb] AISAT-1 PS4 antenna configuration ?",
    "date": "2019-04-12T18:46:53Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "There are seperate antennas for the AiS and the APRS payloads and there is no interference between the two payloads. \n\n73\nNitin [VU3TYG]\n\n--------------------------------------------\nOn Fri, 12/4/19, KC9SGV via AMSAT-BB <[email protected]> wrote:\n\n Subject: Re: [amsat-bb] AISAT-1 PS4 antenna configuration ?\n To: [email protected]\n Date: Friday, 12 April, 2019, 4:01 PM\n \n Sharing the 2m antenna...\n (APRS and AIS)\n IF this is the\n case, then...\n Hope suitable design and\n testing went on before the launch.\n \n Even if two separate antennas are used, they\n might heavily interfere with each other on the same band.\n And if hundreds of AIS ship customers are\n beaconing through the sat, then the APRS system might be\n deafened by same band, close frequency interference.\n Maybe the reason why lots of RF power is\n required to work this sat on APRS.\n \n Repeater builders know this...\n \n http://www.repeater-builder.com/projects/2m-dup/dupfig13.jpg\n \n http://www.repeater-builder.com/projects/2m-duplexer.html\n \n One other solution might be to\n alternate the systems on and off.\n Thus no\n interference takes place system to system.\n If this is the case, then we simply do not know\n the APRS \"on\" schedule.\n It could\n be off over NA today and on again over NA tomorrow.\n \n Where can we find better\n guidance ?\n \n KC9SGV\n \n Sent from my iPad\n \n > On Apr 12, 2019, at 10:19 AM, KC9SGV\n <[email protected]>\n wrote:\n > \n > If they\n use one antenna for both AIS and APRS...\n > (APRS was added as an afterthought,\n completed in six days, just a box, no antenna, no battery,\n no power panels.)\n > If this is the case,\n AIS has thousands of ships all trying to work the antenna\n automatically.\n > There are only a few\n hams trying to work APRS through the same antenna per\n pass.\n > Without proper diplexing, how\n would this system not be blind to APRS ?\n > AIS is ~160 MHz for ship to shore\n connections.\n > Not sure what the sat\n connection freq would be for AIS.\n > Maybe\n it is time for AMSAT India and Exseedspace to inform us hams\n here ?\n > \n > KC9SGV\n > \n > Sent from my iPad\n _______________________________________________\n Sent via [email protected].\n AMSAT-NA makes this open forum available\n to\n all interested persons worldwide without requiring\n membership. Opinions expressed\n are solely\n those of the author, and do not reflect the official views\n of AMSAT-NA.\n Not an AMSAT-NA member? Join\n now to support the amateur satellite program!\n Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb\n \n",
    "attachments": []
}