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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/DKMI3RKE5CWD4DDPBJVQCG7SUTXNPCPR/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "DKMI3RKE5CWD4DDPBJVQCG7SUTXNPCPR",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/3ARIKJCGX3MWR7GN65UW4RXJ3STYS3QA/?format=api",
    "sender": {
        "address": "ve9qrp (a) gmail.com",
        "mailman_id": "4d6061838db34aba9a1c4722addebfaf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4d6061838db34aba9a1c4722addebfaf/emails/?format=api"
    },
    "sender_name": "Bruce Robertson",
    "subject": "[amsat-bb] Re: Starting up",
    "date": "2008-03-29T14:28:33Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3ARIKJCGX3MWR7GN65UW4RXJ3STYS3QA/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Fri, Mar 28, 2008 at 7:55 PM, Alberto Mart <[email protected]> wrote:\n> I do belong a TS-2000k and i'd experience some traffic over satellite. I did attempt using my vertical but results did not make me happy (very limited, in time, footprint and fading). I was recommended to check Gulf Antenna but they have jsu drop satellite's solutions (in term of antennas).\n>\n>   I would buy a pair of 2 mts and 70 cms antenna and phasing them. Where could I find more infos ? i did \"google\" as well but did not find usefull infos (from my point of needs).\n>\n>   I do hope some \"guru\" here could forward me to the right antenna's manufacturer.\n>\n>   73s de Alberto, iz0fma\n>\n\nAlberto:\n\nI'm by no means a guru, but I'm happy I followed the advice of the\ngurus who recommended me to build my own antennas for LEO\ncommunications. In truth, the LEOs do not require very high-gain\nantenna systems.\n\nOne approach which has please many of us is to use a simple TV-type\nrotor to rotate two yagis which are pointed at an elevation somewhat\nabove horizontal, say around 20 deg. If you keep the gain of the yagis\nlow, you can adjust the rotor manually a couple of times during a\npass.\n\nI have built four antennas using the Kent Britain 'Cheap Yagis' design\nin single polarization. I used bronze welding rods, not aluminum, as\nelements. My 435 MHz antenna is an 8 element design, and the 144 was\nthree. I'd be inclined to go for 4 elements on 144, but with that\ncombo you can work all the LEOs with great style. I built these\nwithout an antenna analyzer, using a VHF/UHF SWR meter. You don't need\nto get the SWR perfect for satellite work.\n\nPlease note, though, that there is pretty broad consensus that for any\nantenna design you should have a mast-mounted low noise preamp\ninstalled, especially on 435 MHz. In my experience everyone's advice\nis based on the assumption that you have one of those. In your case,\nwith the 100 and 50w available on transmit, the uplink power will\nnever be a problem with working receiving antennas.\n\nI'm slowly upgrading all this to a full az-el arrangement with higher\ngain antennas. This is a considerably greater engineering challenge,\nand means that, in the Winter, if anything goes wrong I'm off the air\nfor quite a while. I'm enjoying trying to meet the challenge, but my\nstruggles make me all the more certain that a simple, low gain, design\nis ideal.\n\n73, Bruce\nVE9QRP\n",
    "attachments": []
}