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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P6BLTH7QJMJQLR6I7QUUSO7YMPBDWHM4/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "48067C0BEF1141768F14CB92F838D6BB@KC6UQH",
    "message_id_hash": "P6BLTH7QJMJQLR6I7QUUSO7YMPBDWHM4",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/WD43JULVH2P7OOKY2UY3GZQBMLY4TGQ4/?format=api",
    "sender": {
        "address": "kc6uqh (a) cox.net",
        "mailman_id": "d9201820d18047e4a2772c86bda5e111",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/d9201820d18047e4a2772c86bda5e111/emails/?format=api"
    },
    "sender_name": "Art McBride",
    "subject": "[amsat-bb] Re: RH and LH CP simutaniously",
    "date": "2009-01-04T07:01:31Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P5SQLNRHPNN5ZUDGEAW53M54UB7V7BSE/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi All,\nMy thoughts: \nThe polarization is a function of the pointing angle of the Space Craft\nantenna. If you are looking at the back side the polarization will be\nopposite rotation. Switching polarization will improve performance provided\nthe antenna does not have a large front to back ratio. Reflections also will\nreverse the polarization but they are at least -15 db lower than the direct\nsignal. \nSwitching from right to left hand rotation is something that is done if you\nexperience a fade and most of the time the change is not beneficial.\nContinuous switching will give signal 1/2 the time and noise the other half\nof the time. The net result is a 3 dB loss in signal all of the time as the\nsignal is never equal in both rotations at he same time for the same\nobserver location.\n\nArt, KC6UQH\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of R. Chastain\nSent: Saturday, January 03, 2009 7:33 PM\nTo: Amsat-BB\nSubject: [amsat-bb] Re: RH and LH CP simutaniously\n\nBut if the switching frequency was say.... 30-40khz, wouldn't the sidebands\nbe so far out of range so as not to cause interferance.\n \nRoD\nKD0XX\n\n--- On Fri, 1/2/09, John B. Stephensen <[email protected]> wrote:\n\nFrom: John B. Stephensen <[email protected]>\nSubject: Re: [amsat-bb] RH and LH CP simutaniously\nTo: \"R. Chastain\" <[email protected]>, \"Amsat-BB\" <[email protected]>\nDate: Friday, January 2, 2009, 6:30 PM\n\nYou can use a 90-degree hybrid splitter/combiner to produce LHCP and RHCP\nfor\ntwo receivers. Switching will produce sidebands at the switching frequency\nand\nalias undesired signals into the receiver passband.\n\n73,\n\nJohn\nKD6OZH\n\n----- Original Message ----- From: \"R. Chastain\"\n<[email protected]>\nTo: \"Amsat-BB\" <[email protected]>\nSent: Friday, January 02, 2009 23:15 UTC\nSubject: [amsat-bb] RH and LH CP simutaniously\n\n\nHi all,\nHas anyone ever considered the possibilty of using PIN diodes and a free\nrunning square wave oscillator to electronically switch between RHCP and\nLHCP?\nThe switching frequency would have to be high enough so as to not introduce\na tone to the signal.\n\nJust a thought I have had for awhile.\n\nRoD\nKD0XX\n\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\n\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\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 3733 (20090102) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n\n\n \n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 3733 (20090102) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n  \n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 3734 (20090103) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n \n \n\n__________ Information from ESET NOD32 Antivirus, version of virus signature\ndatabase 3734 (20090103) __________\n\nThe message was checked by ESET NOD32 Antivirus.\n\nhttp://www.eset.com\n \n\n\n",
    "attachments": []
}