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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PM3ZO5Q7VIMVLV7QZIGR5ADYHNAE2IKG/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "PM3ZO5Q7VIMVLV7QZIGR5ADYHNAE2IKG",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/AQADUCXA5DV6G4LRT3WP7ZEHJSDEBMTX/?format=api",
    "sender": {
        "address": "cptcurt (a) flash.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Curt Nixon",
    "subject": "[amsat-bb] Re: Question adding RHCP to Cheap Yagi",
    "date": "2009-01-02T18:02:36Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2OI465TXUFJECGHGSZI3XR4LRI76VCHD/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Thanks Howard...Thin I've got it.  Its going up this afternoon.  Boom is \ndrilled, elements made.  Just mounting them now and then the harness..\n\nCurt\n\n\n\n\n\n\nHoward Long wrote:\n> Hi Curt\n>\n> There are several ways to skin the same cat.\n>\n> Although they are fed in phase, they are orthogonally mounted and with their\n> spatial separation a 90 degree phase delay is created, thus creating CP.\n>\n> If the elements are still orthogonal but are at the same location along the\n> boom, then the delay would need to be inserted electrically, with an\n> electrical 1/4 wave section of 50 ohm coax. Some CP antennas use a\n> combination of both spatial and electrical phase difference.\n>\n> To switch RHCP to LHCP can be achived by any of the following three means:\n>\n> O Insert an additional 180 degree electrical delay between one arm of the\n> power splitter and the antenna, with an electrical lambda/2 50 ohm coax\n> section;\n>\n> O Physically move one set of elements 180 degrees forward or behind;\n>\n> O Turn one of the driven elements 180 degrees so the loop is on the other\n> side of the antenna, but maintain the same electrical connections.\n>\n> This may (of may not!) help... http://www.g6lvb.com/remotepolarization.htm\n>\n> It takes a bit of lateral thinking, but once you've figured it out it's a\n> bit like learning to ride a bike in that you don't forget, although in later\n> years I find one may become a little wobbly.\n>\n> 73, Howard G6LVB\n>\n>\n> -----Original Message-----\n> From: Curt Nixon [mailto:[email protected]] \n> Sent: 02 January 2009 16:50\n> To: Howard Long\n> Cc: 'AMSAT-BB'\n> Subject: Re: [amsat-bb] Question adding RHCP to Cheap Yagi\n>\n> Hi Howard:\n>\n> Thanks..I've looked at alot of your info on-line--especially the sub-500GBP\n> AO-40 setup. \n>\n> I guess I still don't get it..if I just feed them in-phase with both\n> connections same polarity, what controls RH v. LH?\n>\n> Or is it RH if the front half loop is to the right and LH if the front\n> half-loop is to the left?\n>\n> Thanks\n>\n> Curt\n>\n> Too cold to not get it right on the first try!! \n>\n>\n>\n> Howard Long wrote:\n>   \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>\n>\n>   \n\n",
    "attachments": []
}