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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7SNIUVEU5UUE3ELSK2JYTHLM2UVZAEZW/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "1974192419.2300501247693568117.JavaMail.root@sz0155a.westchester.pa.mail.comcast.net",
    "message_id_hash": "7SNIUVEU5UUE3ELSK2JYTHLM2UVZAEZW",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FBNN3W3AJBGQFIS2KLVCQNGLPJ4VFYMP/?format=api",
    "sender": {
        "address": "w6zkh (a) comcast.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb]  Fwd:   Polarity switching question",
    "date": "2009-07-15T21:32:48Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FBNN3W3AJBGQFIS2KLVCQNGLPJ4VFYMP/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thanks to all who have replied to my message concerning switching polarity. I think I understand it now, somewhat ! While in Las Vegas yesterday, stopped at AES and picked up the Satellite Handbook by ARRL, and that gave a good description of it and other items I need to learn also. Thanks again to all. \n\nJohn W6ZKH \n\n----- Forwarded Message ----- \nFrom: [email protected] \nTo: \"amsat-bb\" <[email protected]> \nSent: Monday, July 13, 2009 7:51:30 AM GMT -08:00 US/Canada Pacific \nSubject: [amsat-bb] Polarity switching question \n\nI recently obtained a pair of KLM yagi's for satellite work. They both have the KLM polarity switching box mounted and wired up. Since I havent put them up yet, and not well versed in the subject, I got out my ohm meter just to see what was what on this item. I noticed that both driven elements have continuty to the center pin of the coax at the same time. I was under the impression that the relay switched back and forth the driven elements to give either RH or LH polarity. I havent applied the 12 volts to the box yet to check that out, but was just curious. One thing I have noticed while using the downlink yagi is that I get very little fade due to polarity when I turn the antenna. I hope that is a good thing?? I havent checked the uplink yagi to see if it has the same results. \n\nI hope someone can enlighten me abit. \n\n73 de John W6ZKH \n\n\n_______________________________________________ \nSent via [email protected]. Opinions expressed are those of the author. \nNot an AMSAT-NA member? Join now to support the amateur satellite program! \nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n",
    "attachments": []
}