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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2OI465TXUFJECGHGSZI3XR4LRI76VCHD/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "EE3CA2D20AEA438EBCB5D771526CB0F6@LAPTOP9",
    "message_id_hash": "2OI465TXUFJECGHGSZI3XR4LRI76VCHD",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/AQADUCXA5DV6G4LRT3WP7ZEHJSDEBMTX/?format=api",
    "sender": {
        "address": "howard (a) howardlong.com",
        "mailman_id": "82a1d3d58c6f48898b755d208f81930e",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/82a1d3d58c6f48898b755d208f81930e/emails/?format=api"
    },
    "sender_name": "Howard Long",
    "subject": "[amsat-bb] Re: Question adding RHCP to Cheap Yagi",
    "date": "2009-01-02T17:12:04Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KKGYOBTN3CPYDVDJ4RA5HKI4QWH3OYGY/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PM3ZO5Q7VIMVLV7QZIGR5ADYHNAE2IKG/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Curt\n\nThere are several ways to skin the same cat.\n\nAlthough they are fed in phase, they are orthogonally mounted and with their\nspatial separation a 90 degree phase delay is created, thus creating CP.\n\nIf the elements are still orthogonal but are at the same location along the\nboom, then the delay would need to be inserted electrically, with an\nelectrical 1/4 wave section of 50 ohm coax. Some CP antennas use a\ncombination of both spatial and electrical phase difference.\n\nTo switch RHCP to LHCP can be achived by any of the following three means:\n\nO Insert an additional 180 degree electrical delay between one arm of the\npower splitter and the antenna, with an electrical lambda/2 50 ohm coax\nsection;\n\nO Physically move one set of elements 180 degrees forward or behind;\n\nO Turn one of the driven elements 180 degrees so the loop is on the other\nside of the antenna, but maintain the same electrical connections.\n\nThis may (of may not!) help... http://www.g6lvb.com/remotepolarization.htm\n\nIt takes a bit of lateral thinking, but once you've figured it out it's a\nbit like learning to ride a bike in that you don't forget, although in later\nyears I find one may become a little wobbly.\n\n73, Howard G6LVB\n\n\n-----Original Message-----\nFrom: Curt Nixon [mailto:[email protected]] \nSent: 02 January 2009 16:50\nTo: Howard Long\nCc: 'AMSAT-BB'\nSubject: Re: [amsat-bb] Question adding RHCP to Cheap Yagi\n\nHi Howard:\n\nThanks..I've looked at alot of your info on-line--especially the sub-500GBP\nAO-40 setup. \n\nI guess I still don't get it..if I just feed them in-phase with both\nconnections same polarity, what controls RH v. LH?\n\nOr is it RH if the front half loop is to the right and LH if the front\nhalf-loop is to the left?\n\nThanks\n\nCurt\n\nToo cold to not get it right on the first try!! \n\n\n\nHoward Long wrote:\n> Hi Curt.\n>\n> Either way will work.\n>\n> http://www.g6lvb.com/AO-40%2070cm%20uplink%20antenna.htm\n>\n> I have had superb success with mine, in fact during the days of AO-40 \n> I worked the world with it as an uplink antenna with 50W.\n>\n> http://www.g6lvb.com/3A2%20ops.htm\n> http://www.g6lvb.com/dayton_demo_2002.htm\n>\n> 73, Howard G6LVB\n>\n> -----Original Message-----\n> From: [email protected] [mailto:[email protected]] \n> On Behalf Of Curt Nixon\n> Sent: 02 January 2009 15:19\n> To: AMSAT-BB\n> Subject: [amsat-bb] Question adding RHCP to Cheap Yagi\n>\n> Good Morning All:\n>\n> I've been using a 10el version of Kent Britain's Cheap yagi for my \n> 70cm downlink antenna.  It suffers from deep fades so I am going to \n> add the second yagi with physical offset to get to RHCP in the x config.\n>\n> Question is:\n>\n> normally I would reverse the coax connections to a dipole driver but \n> this is a hairpin (half of a folded dipole. )\n>\n> Do I reverse the connections as normal?  Kents instructions just say \n> offset the elements and feed in phase.\n>\n> Thanks\n>\n> Curt\n> KU8L\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>\n>   \n\n",
    "attachments": []
}