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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KKC5RM3BQY3MJ5PIYN6P32Q6EC2Y6NMV/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "KKC5RM3BQY3MJ5PIYN6P32Q6EC2Y6NMV",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KKC5RM3BQY3MJ5PIYN6P32Q6EC2Y6NMV/",
    "sender": {
        "address": "kj9idave (a) charter.net",
        "mailman_id": "988be3aca87c49459679818fb206efd5",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/988be3aca87c49459679818fb206efd5/emails/"
    },
    "sender_name": "David J. Schmocker",
    "subject": "[amsat-bb] RFI/EMI-quiet LED 48 inch T8 tube lights (to replace\tfluorescents)",
    "date": "2020-07-18T21:13:35Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Everyone:\nSome of us have fluorescent tube-lights in our homes or garages and \ndesire to replace them with energy-efficient LED bulbs. However as \nweak-signal enthusiasts, many LED bulbs are electrically noisy.\n\nSo I set out to identify and test LED bulbs that are both energy \nefficient and EMI/RFI quiet (starting at 50.2 MHz because I do \nmoon-bounce work there).\n\nThis need for electrical quiet applies also to 2m and 70cm and other \nsatellite bands too.\n\n\n50.2 MHz test findings:\n\nTest site (KJ9I QTH): N5654 County Road F  Sullivan, WI 53178\n\nTest location: basement of residence (location of these lights)\n\nTest date: May 2020\n\nTest result: no change in WSJT v10 Rx level with all basement lights on \nor off (0dB relative signal level both before and after lights \nilluminated).\n\n\nFluorescent light replacement (formerly electronic ballasts) converted \nto direct-wire, single-end fed LED bulbs.\n\n*Hyperikon SKU: 841000631* (XYL requirement was soft-white, so 3000 \ndegrees K was selected).  18w bulbs.\n\nIn May 2020, I installed 14 bulbs (seven dual light fixtures) removing \nthe old ballasts and fluorescent tube lights.   I trimmed all unused \nwires to minimum physical length and removed excess wire from fixtures \nthat had been attached to electronic ballasts.\n\nThe fixtures in which these were installed are typical tin metal legacy \nfluorescent fixtures.\n\nNote:  Hyperikon Non-Shunted Tombstones (end mounts) were replaced on \nonly the energized end of each installed LED bulb. The opposite \n(non-energized) end retained the original tombstone with wires trimmed \noff as short as possible.\n\n\nThere is no change in my WSJT v10 (nor WSJT-X) signal level with lights \nall on or off.    When Rx level is set to 0dB, it holds at this level.\n\nTest Antenna is 1 x LFA-HZE-10 (2-inch homebrew round boom design) up 88 \nfeet Above Ground Level with HA8ET 50MHz LNA fed into SSB Electronic \nLT6S transverter (1dB NF) then to JRC JST-245DX 28Mhz transceiver.\n\n\nToday I received good news that another ham (Frank W3LPL) also installed \nHyperikon LED bulbs at his QTH and he also reported 6m RFI-quiet.\n\nI hope this data is useful.   73,\n\nDave KJ9I\n\n\nThe disclaimer: I have no financial nor any other connection with \nHyperikon beyond being a satisfied customer of the above bulbs.\n\n\n",
    "attachments": []
}