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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FKF7ZIKAYIPGVWS72EAVP4JCFZMAMFBS/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "02b401c756b3$40eeb930$6601a8c0@sierrap4dual",
    "message_id_hash": "FKF7ZIKAYIPGVWS72EAVP4JCFZMAMFBS",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/FKF7ZIKAYIPGVWS72EAVP4JCFZMAMFBS/",
    "sender": {
        "address": "jkopala (a) gmail.com",
        "mailman_id": "083d74d034614b08876fb7affa0a2348",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/083d74d034614b08876fb7affa0a2348/emails/"
    },
    "sender_name": "John Kopala",
    "subject": "[amsat-bb] Re: Advice on antennas for working the LEO's (Gary\tMcKelvie)",
    "date": "2007-02-22T18:57:07Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Gary,\n\nMy XYL is not fond of my antennas either.  But we are also redoing the \nkitchen with new appliances, new counter top, and having the cabinets \nrefinished with new doors.  Then there is the upcoming vacation to \nGreece....  Not sure if that gives any leverage, but it certainly doesn't \nhurt.  I'll still hear plenty about how ugly the antennas are after they go \nup.  The problem is that beauty is in the eyes of the beholder.  A Ham and \nthe XYL certainly have different perceptions of beauty.\n\nI have interfaced a TAPR TrakBox kit that I \"inherited\" to my rotors.  So I \nwill have that part pretty well automated.  There are a fairly significant \nnumber of interfaces that can be used with computer software to track \nsatellites.  Take a look at Nova for windows on the AMSAT site.  There is a \nlist of the different interfaces that it is compatible with.  Makes a good \nresearch and shopping list if you plan to go that way.\n\nAs far as the ERP goes, does the FT-847 allow you to smoothly control the \npower output?  I have been experimenting using an IC-706MKII-G and a Yaesu \nMobile FM radio.  The Mobile radio radio has the disadvantage of only having \nhigh and low power so it is less than ideal for satellite work but it does \nprovide duplex FM operation.  You are still working on the antenna setup and \nan automated interface.  In my case, I still need to get the radio to \ncomplete the setup.  That will wait until I finish the antenna installation. \nI am planning on using an Icom IC-910H.  I believe  its power output is \ncontinuously variable.  I\"m also planning to use the matching preamps for \nweak signals.\n\nThe beams with their inherent gain will enable working satellites on more \npasses and lower elevations.  You may experience some fading with fixed \npolarization, but the gain of the antennas may compensate for that.  Some of \nthe satellites do require a little more power to get into, but your setup \nshould be more than adequate.\n\nToff; HS0NNU has some good alternatives.  I'm sure you have already read his \nposting.  A friend of mine suggested a similar approach for working without \nan elevation rotor.  Most satellite passes don't reach particularly high \nelevations.  Since you already have an elevation rotor, I would take \nadvantage of that.  You can track the satellite for the entire pass without \nhaving to switch antennas when the satellite elevation is high.\n\nThat about covers everything that I can think of.  Sounds like you'll have a \nreally good setup when you finish.\n\nJohn Kopala\nN7JK\n\nDate: Thu, 22 Feb 2007 00:23:48 +0000\nFrom: Gary McKelvie <[email protected]>\nSubject: [amsat-bb] Re: Advice on antennas for working the LEO's\nTo: [email protected]\nMessage-ID: <[email protected]>\nContent-Type: text/plain; charset=\"us-ascii\"; format=flowed\n\nHi John and others,\n\nThanks for the picture lovely set up. If only I could get the XYL to\nlet me stick something similar on the roof :)\nI do have an elevation rotator already :) IIRC a Kenpro 550 or 450.\nI have played about in the past with satellites, at that time I had a\n11 element 2 meter RHCP and a 19 element 70 RHCP (Hence the elevation \nrotator).\nI mainly listened rather than transmitted.\n\nSo really I have all the equipment except for a way to automate the\nantenna control, which as you say isn't too difficult to do manually\nand an antenna.\nI really don't thing the XYL will let me put up the 11 and 19 element\nantennas which I still have, as she thinks I have enough antennas in\nthe air already <g>\nAs you can see the sats aren't a passing fad with me, it's just that\nI will be on LEO's as a way of compromise. It has taken me a while to\nget back to them, but i bought the 847 recently to motivate me to\nactually put my words into action rather than just wishing on a star :P\n\nSeveral people have suggested using a vertical antenna such as a\ncolinear. I have actually already tried this and the results are very\ndisappointing, which I put down to my location rather than anything\nelse as where I am is not particularly that good certainly form a\nVHF/UHF point of view.\n\nOther things I was wondering about was the ERP at the satellite,\nwould it be too high causing me to be an alligator?\nRoughly the ERP on 2 would be about 50 watts and higher on 70 as the\ngain would be about 13 dBd plus whatever 5 watts equals. losses\nshould be very small as the run of coax would be less than 30 feet,\nmost of that being Westflex 103 and just the a very short length of\nRG 213 for getting the antenna hooked up and round the rotator/s.\nI'm not sure how to work out the path loss from my location (is there\na standard figure or equation to use?)\nso at present I'm still very tempted to go with the Tonna, as it\ncertainly seems to be better than the arrow antennas in that it has a\nhigher gain figure.\nPlease note I am not commenting on the quality of the construction of\nthe Arrow.\nThe other aspect I'm wondering about is cross polarization losses,\nthe way that I plan to have it configured is with the 2 meter section\nhorizontal and the 70 cm vertical. So would that be significant for the \nLEO's?\n\n73 Gary G7USC\n\n",
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}