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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LYLX574SSH5K6PELHZXQVE75LLGGAY3E/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "01f501c75607$33fcbdf0$6601a8c0@sierrap4dual",
    "message_id_hash": "LYLX574SSH5K6PELHZXQVE75LLGGAY3E",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/LYLX574SSH5K6PELHZXQVE75LLGGAY3E/?format=api",
    "sender": {
        "address": "jkopala (a) gmail.com",
        "mailman_id": "083d74d034614b08876fb7affa0a2348",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/083d74d034614b08876fb7affa0a2348/emails/?format=api"
    },
    "sender_name": "John Kopala",
    "subject": "[amsat-bb]  Advice on antennas for working the LEO's",
    "date": "2007-02-21T22:25:32Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Q22FMCSPSK45KGDN6DO7JTLVZY7WZRT7/?format=api"
    ],
    "votes": {
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        "status": "neutral"
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    "content": "Hi Gary,\n\nI just thought I'd throw in my 2 cents.  I don't have a great deal of \nexperience with satellites, but I will offer a few comments based upon my \nlimited experience.\n\nThe antenna by Tonna with 13 DBi on 2 and 16 DBi on 70 is going to have a \nfairly narrow beamwidth and is obviously a fairly long antenna.  It will \nneed to be pointed with reasonable accuracy.  If you are 30 degrees off you \nmight as well be pointed the other way.  With that much gain, you should be \nable to work most satellites without the preamps.  The problem is aiming the \nantennas.  I recommend using azimuth and elevation rotors.  Azimuth alone \nwon't do it with narrow beamwidth antennas if the satellite pass reaches a \nsignificant elevation.  The software programs will tell you where to aim the \nantenna and you can easily do that with the rotor control boxes while \nworking stations on the radio.  The adjustments are easy and don't take that \nmuch time away from operating.\n\nI tried an experiment with a tripod and a set of KLM antennas mounted on a \ncross boom.  Aiming a large set of antennas manually can quickly turn into a \nfull time job.  I was testing this to see if it was practical to take to \nscout outings.\n\nAfter trying the tripod setup, I modified the setup and put in my rotors. \nUsing the rotor controllers, made this very workable.  I'll send you a \npicture separately of the setup.  Basically, I had a stake in the ground, a \n5 ft mast slipped over the stake with a rotor at the top end.  The rotor is \nguyed with 3 additional stakes.  Above the rotor is another 5 ft mast \nsection, elevation rotor, crossboom, and VHF and UHF satellite antennas. \nObviously, if you are using a single dual band antenna, the whole setup is \nsomewhat simpler.  What you see in the picture is destined for my roof plus \nadditional antennas.\n\nIf you use an antenna that is small enough to hold and point by hand, you \nwill lose a lot of gain vs the big antenna, but it will be a lot easier to \npoint.  You still need real time data for the azimuth and elevation and some \nsort of azimuth and elevation aids would help.  Some people enjoy working \nsatellites with the Arrow antenna.  Personally, I have not have a lot of \nluck with reading azimuth and elevation, manually aiming, talking on the \nradio all at the same time.\n\nJohn Kopala\nN7JK\n\n\nDate: Wed, 21 Feb 2007 09:44:00 +0000\nFrom: Gary McKelvie <[email protected]>\nSubject: [amsat-bb]  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 to the List,\n\nMy names Gary,  I'm just getting started in the sats, initially\nlooking to work the LEO's with FO 29 in particular.\nThe station is going to consist of a Yaesu FT 847 cat controlled by\nHam Radio Delux to control the radio for Doppler.\n\nIt's suitable antennas that I have a problem with from web pages etc\na lot of people seem to use the arrow antenna,\nwhich unfortunately as far as I can see is not available here in the UK.\nThere is an antenna by Tonna which is a 9 element on 2 and 19 element\non 70 claimed gain is 13 dBi on 2 16 dBi on 70.\nThe feed line I will be using to get to the antenna will be a short\nrun of West Flex 103 (which is half the loss of RG 213)\nI'm hoping to avoid the use of pre amps if possible as getting power\nto them is a problem.\nThis antenna set up will be temporary in nature, with it being set up\neach time it is in use.\nI will be able to rotate the antenna in azimuth by hand or using a\nazimuth rotator.\nSo would this setup work?\nSo really all I'm not sure is how effective this setup will be and am\nlooking for ideas and suggestions.\n\nRegards\n\nGary G7USC\n\n\n\nGary McKelvie\nG7USC\nWeb : www.garym.org.uk\n\n",
    "attachments": []
}