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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JAHMCBZOJLINBANTZA3RYJQWNO5JU6JJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "C2846CEB72CD47ED99118F8D5F060D70@QUECREEK",
    "message_id_hash": "JAHMCBZOJLINBANTZA3RYJQWNO5JU6JJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JAHMCBZOJLINBANTZA3RYJQWNO5JU6JJ/?format=api",
    "sender": {
        "address": "wb3jfs (a) cox.net",
        "mailman_id": "bdfc678d05af4f3f96c14d823fd3fbcf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bdfc678d05af4f3f96c14d823fd3fbcf/emails/?format=api"
    },
    "sender_name": "Jeff Yanko",
    "subject": "[amsat-bb]  Arrow antenna reconfiguration results - UPDATE",
    "date": "2009-09-25T09:10:24Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/M4H7PMQ5XG3XLBJKSAFLWNAX5F7A5DS5/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi all,\n\nA quick update to my new project to improving the Arrow antenna, efficiency \nwise.  I wanted to see how well it would perform on gaining and losing \naccess during AOS and LOS.  AO-27 is not a good choice since the timer is \nturned on when it is well above the AOS horizon and it is switched off \nbefore it reaches its LOS horizon.  That leaves a dependable AO-51 to test \nit out.\n\nWith the last setup, the OEM diplexer provided by Arrow Antenna, I would \ncopy AO-51 about 3 minutes after AOS and lose it about 3 to 4 minutes before \nLOS.  Not bad, but people were saying they worked the birds when they were 1 \ndegree off of the horizon.  I have some pine trees that could be an issue \nbut they are spaced far enough apart that I can work between them and I also \nhave to deal with the McCollough Range to the SSE of me here in Las Vegas, \nNV.  Today, there were 2 passes of AO-51, one at 12 degrees elevation, the \nother at 74 degrees.  During both passes, I began to copy the downlink about \na 1.25 minute after AOS.  A considerable difference from 3 minutes.  The \ndownlink also improved down to about minute before LOS.  On the last pass I \nworked KG6NUB at 0124z and LOS was 0125z and my downlink sounded fairly \ngood, though I was fighting desense.  (That's another issue I need to \nresolve.)  Also, on both passes, I never once lost the downlink.  No \ndropouts or fades.  I'm still amazed.\n\nAnother issue I came across was how wide the beamwidth is of the Arrow \nAntenna between the Arrow diplexer and the new diplexer.  I was wondering if \nthis was going to happen and it did.  The reason that this happened was with \nthe old diplexer, the signal attenuated so much that you had to be pointed \nright smack dab on the bird, a few degrees off and you lost the signal. \nNow, with the new diplexer, you can point the beam in the general direction \nand still copy the bird.  In most cases I had to turn the beam 90 degrees \nbefore I completely lost the downlink!  Twisting the antenna to make \npolarization changes makes absolutely no difference now.  This also \nattributes to the fact that now I'm copying the entire pass without dropouts \nor fades.  Makes sense.  What I've regained over the lossy diplexer makes up \nfor any polarization differences, etc. for a better copiable signal.\n\nNext weekend I will have to try more passes and get a feel of how much this \nsystem has changed.\n\n\n73,\n\nJeff  WB3JFS\nLas Vegas, NV\nDM26\n\n\n\n \n\n\n",
    "attachments": []
}