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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TTNRHUAI3FANNERFQ3JIPPJZ5P7VXD3G/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "CAJUhCTPdKnVmf==qhixSQ+8n-Sf43z8qh+-i1CQMxcEQJNSCmQ@mail.gmail.com",
    "message_id_hash": "TTNRHUAI3FANNERFQ3JIPPJZ5P7VXD3G",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/QOYTKAEB7CS2EZWQBC5V6BOYYPCINF36/?format=api",
    "sender": {
        "address": "normanlizeth (a) gmail.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Lizeth Norman",
    "subject": "[amsat-bb] Re: why not to buy an M2 antenna",
    "date": "2013-12-11T11:10:38Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KWXRA4PURNT2TC4DTFUVWRAFFKOEJHMF/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Dave,\nMy times technologies T100 says the switching block failed. I am not\nworried about cosmetics. Cosmetics don't get grid squares.\nHave fun,\nNorm n3ykf\n\n\nOn Tue, Dec 10, 2013 at 3:46 PM, David Metz <[email protected]> wrote:\n\n> The damage shown in the photos is simply the plastic (my guess is it is\n> Delrin) breaking down from UV exposure.  Back in the 80's I built my own\n> circular polarized antennas for 70cm and 2M for AO-13. Having a lathe I\n> made some parts from white Delrin (a nylon like material).  After about ten\n> years it showed the same UV damage. Note that the black plastic element\n> insulators in the photos are not cracked.  The black pigment used in the\n> element insulators apparently protects them from UV.  After learning this\n> lesson I started using the black Delrin for my home brew antennas and have\n> had no problems with UV damage.  All that said, some plastics are more\n> resistant to UV than others.  I have two M2 antennas in use for terrestrial\n> use and after ten years of being up in the elements they are both working\n> well.  Note that the UV damage may not have gone all the way to the core of\n> the component yet.  If it is still mechanically intact (and just looks\n> awful), it can be salvaged by coating it with a thick black sealant and\n> covering that with black electrical tape.\n>\n> --73-- Dave WA0AUQ\n>\n>\n> _______________________________________________\n> Sent via [email protected]. Opinions expressed are those of the author.\n> Not an AMSAT-NA member? Join now to support the amateur satellite program!\n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n>\n",
    "attachments": []
}