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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YHEIQS6YNXJSVTL6U2OSRWYOTEXYJ3Q2/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "7827FCC71BB84C9A9B041AC1CD91B56E@RadioRoomPC",
    "message_id_hash": "YHEIQS6YNXJSVTL6U2OSRWYOTEXYJ3Q2",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/DRX24BHKTE3BVSOUDOULZAHMFQU4QLSV/?format=api",
    "sender": {
        "address": "ka3hsw (a) att.net",
        "mailman_id": "afface7d7e8049fda539552165bdde78",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/afface7d7e8049fda539552165bdde78/emails/?format=api"
    },
    "sender_name": "George Henry",
    "subject": "Re: [amsat-bb] IC-910h preamp power and inline coax switch.",
    "date": "2018-06-29T04:04:20Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DRX24BHKTE3BVSOUDOULZAHMFQU4QLSV/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Many antennas present a DC short, so the preamp power is current-limited,\nand you will not damage it by using an antenna switch that shorts the\nconnection when switched.\n\n\n73,\nGeorge, KA3HSW\n\n\n\n-----Original Message-----\nFrom: AMSAT-BB [mailto:[email protected]] On Behalf Of Charles\nReiche\nSent: Thursday, June 28, 2018 3:16 PM\nTo: [email protected]\nSubject: [amsat-bb] IC-910h preamp power and inline coax switch.\n\nI am getting up to speed on working NO-84 with my TH-D72a.  My primary\nantenna system and radio is IC-910h with the Icom Preamp installed near the\nantenna.  The 910 powers the preamp through the coax, and I tend to leave\nthe preamp on selection on the radio on all the time.\n\nI want to put a MFJ1702C coax switch inline with the 2m side so I can\nbranch out the 2m antenna to my HT.  The non selected port of the coax\nswitch is grounded.  If you accidentally ground the IC-910's coax with the\npreamp selected on, does it damage the preamp power circuit or is it\ntolerant of a short? I could not find a definitive answer in the manual\nother than the preamp may not activate properly.  I know it wont power up\nthe preamp.\n\nInevitably, if I have to rely on remembering to turn off the preamp before\nI switch to the HT to work NO-84, I will forget. Just want to prevent\nburning something up.\n\nThanks for any suggestions.\n\nN3CRT\nCharles Reiche\n_______________________________________________\nSent via [email protected]. AMSAT-NA makes this open forum available\nto all interested persons worldwide without requiring membership. Opinions\nexpressed\nare solely those of the author, and do not reflect the official views of\nAMSAT-NA.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}