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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/XRWA7TOVLWUCABBH2FSVE2P3QDEQ4OB6/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "070220082343.14479.486C12B9000F3C440000388F22165514060B9D04C999@comcast.net",
    "message_id_hash": "XRWA7TOVLWUCABBH2FSVE2P3QDEQ4OB6",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/XRWA7TOVLWUCABBH2FSVE2P3QDEQ4OB6/?format=api",
    "sender": {
        "address": "w7lrd (a) comcast.net",
        "mailman_id": "717aa2a241704c7497e9abd8c983f6b7",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/717aa2a241704c7497e9abd8c983f6b7/emails/?format=api"
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb] Re: Commercial Mode L Antenna sources",
    "date": "2008-07-02T23:43:54Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Wayne and all\nI agree a four footer would be good for L/S.  I used a four foot primestar for AO-40 (sobsob) on S band.  I now have as yet untried dual feed for L/S for the same dish.  I'm waiting fo the energy to connect everything up and give it try.  I need another downconverter and a  bird 43 L band slug, for tweeking.  The feed is two concentric helix feeds on the same form for L/S.  Should I not get desense to to proximity of the feeds it will be my future L/S antenna.  Yes the primestar is solid and heavy, being off center feed it will lend itself to helix as opposed to a patch feed.  I have heard the 3731AA downconverters from K5GNA have a good front end.  I also have a UEK 3000 downconverter. Which will be be better, I don't know as yet.  If anyone has tread here before I would appreciate your input.\n73 Bob W7LRD\nSeattle\n\n--\n\"if this were easy, everyone would be doing it\"\n\n-------------- Original message -------------- \nFrom: Wayne Estes <[email protected]> \n\n> I'm surprised how few people have mentioned parabolic dishes during this \n> discussion about commercial Mode L antennas. L-band uplinks are mostly \n> used in combination with a S-band downlink. Most people build L/S \n> equipment with HEO satellites in mind. A single yagi or helix doesn't \n> usually provide sufficient gain for L/S band use with a HEO satellite. \n> You need the gain of a dish for satisfactory S-band reception of a HEO \n> satellite. So one practical solution is an oversized dish with a L/S \n> dual-band feed (helix or patch). A 4-foot dish was proven to work well \n> for this on AO40. In my opinion a single 4-foot dish is more practical \n> than, for example, cobbling together multiple yagi/helix antennas for \n> S-band downlink and multiple yagi/helix antennas for L-band uplink. \n> \n> My 4-foot dish and dual-band patch feed were purchased commercially from \n> Teksharp (Rick Fletcher KG6IAL). \n> http://www.plumdragon.com/teksharp/hr_AO-40_products.htm \n> The dual-band patch feed is sold fully assembled and tested, but the \n> dish was a kit. I had to locally purchase 1/4 inch hardware cloth, cut \n> it into 8 \"petals\", and use 200 zip ties to attach the petals to the \n> frame of the dish. A mesh dish has somewhat less wind loading than a \n> solid dish. That's important because a solid 4-foot dish has a maximum \n> wind load of more than 12 square feet, exceeding the wind load rating of \n> my G-5500 rotor. A picture of my satellite antennas can be seen here: \n> http://s238.photobucket.com/albums/ff239/Wayne_Estes/Ham%20Radio/ \n> \n> Wayne Estes W9AE \n> Oakland, Oregon, USA, CN83ik \n> _______________________________________________ \n> Sent via [email protected]. Opinions expressed are those of the author. \n> Not an AMSAT-NA member? Join now to support the amateur satellite program! \n> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb \n",
    "attachments": []
}