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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/SK5HNP4YAMSONXFVFMNWS5MHNR6TGF6N/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "1247497266.12932.9.camel@elric",
    "message_id_hash": "SK5HNP4YAMSONXFVFMNWS5MHNR6TGF6N",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FBNN3W3AJBGQFIS2KLVCQNGLPJ4VFYMP/?format=api",
    "sender": {
        "address": "gordonjcp (a) gjcp.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Gordon JC Pearce",
    "subject": "[amsat-bb] Re: Polarity switching question",
    "date": "2009-07-13T15:01:06Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FBNN3W3AJBGQFIS2KLVCQNGLPJ4VFYMP/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Mon, 2009-07-13 at 14:51 +0000, [email protected] wrote:\n> I recently obtained a pair of KLM yagi's for satellite work. They both\n> have the KLM polarity switching box mounted and wired up. Since I\n> havent put them up yet, and not well versed in the subject, I got out\n> my ohm meter just to see what was what on this item. I noticed that\n> both driven elements have continuty to the center pin of the coax at\n> the same time. I was under the impression that the relay switched back\n> and forth the driven elements to give either RH or LH polarity. I\n> havent applied the 12 volts to the box yet to check that out, but was\n> just curious. One thing I have noticed while using the downlink yagi\n> is that I get very little fade due to polarity when I turn the\n> antenna. I hope that is a good thing?? I havent checked the uplink\n> yagi to see if it has the same results. \n> \n> I hope someone can enlighten me abit. \n\nIf it's circular-polarised then both elements should be wired, with one\ngoing through a 1/4-wavelength loop of wire.  That way, the 90-degree\nrotation of the circular polarised signal translates into a 90-degree\nphase shift between the horizontal and vertical elements.\n\nImagine trying to thread a corkscrew through the elements along the\nlength of the boom, and you'll get it.\n\nGordon 2M0YEQ\n\n",
    "attachments": []
}