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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5F2W6M7XL5LOH6UJI7QFGML37FC6COII/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "5F2W6M7XL5LOH6UJI7QFGML37FC6COII",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/MRKQZ3XA5BS6LYNOFJXFPRVAZOL5H4HI/?format=api",
    "sender": {
        "address": "gary_mayfield (a) hotmail.com",
        "mailman_id": "fe442cdc520e4857a9168b9182091295",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/fe442cdc520e4857a9168b9182091295/emails/?format=api"
    },
    "sender_name": "Gary \"Joe\" Mayfield",
    "subject": "[amsat-bb] Re: Enhance your Easy Sat Experience!",
    "date": "2012-01-06T05:28:28Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/MRKQZ3XA5BS6LYNOFJXFPRVAZOL5H4HI/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5NB5PFV7QVE3AUXHNRXYVV6HIVWVIVYD/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "There used to be a list of full duplex radios at\nhttp://thathamkid.com/fd_radios.html\n\nBut that web seems to be dead.  Many of the full duplex handhelds can be had\nfor little more than a song on eBay.\n\n73,\nJoe kk0sd\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Clayton Coleman W5PFG\nSent: Thursday, January 05, 2012 9:43 PM\nTo: AMSAT\nSubject: [amsat-bb] Enhance your Easy Sat Experience!\n\nHave you thought about upgrading your station to full-duplex capability?\n\nI realize that many amateurs jump into the satellite fray by utilizing\nan existing handheld radio and an antenna like the Arrow, Elk, or\ntape-measure beam. It's a great way to get your feet wet and make\nthat \"first\" contact via the birds.\n\nNow, let's look at how we can do BETTER.\n\nFull-duplex has a very important purpose in the satellite world. It\nallows you, the ground station, to know that your signal is being\nreceived and retransmitted by the satellite. I'm not saying it is a\nmandatory but once you see its benefit, you may never want to go\n\"semi\" again.\n\nHow do you really know you are being heard by the bird if you can't\nhear yourself? Answer: You don't.\n\nHow do you know another station wasn't already being captured by the\nbird and in the middle of a QSO when you transmit? Answer: You don't.\n\nLet's talk about HOW to do full-duplex. First of all, you don't need\nbase-station radios like the Icom IC-9100, IC-910, Kenwood TS-2000, or\nYaesu FT-847. If you own two handhelds, chances are you have what you\nneed!\n\nWhat you need is at least one radio capable of transmitting on the\nuplink and one radio capable of receiving on the downlink. For\nexample using AO-27:\n\n1. A 2m-only HT, set to the satellite's uplink, ~145.85 MHz.\n2. A 70cm-only HT, set to the satellite's downlink, ~436.795 MHz.\n\nOne added benefit is that while hearing the downlink, you can twist\nyour handheld\nantennas (like the Arrow) to match polarity and peak your uplink.\n\nTechnically you do not even need a radio capable of transmitting to\nhear yourself on the downlink. A scanner or pocket receiver works\ndandy!\n\nTo get into full-duplex inexpensively, there are numerous options.\nYou can buy a NEW Baeofeng UV-3R for about $50-60 USD, shipped. This\nradio could serve as an uplink or downlink radio, depending on your\nneed. I'm not peddling these radios but using them as an example.\n\nIf you have the Arrow with the built-in diplexer, simply bypass it by\nrunning a patch cord from each radio to the respective UHF and VHF\nbeams. If you are running an Elk or tape-measure 2m beam, you will\nneed an inexpensive diplexer to give you both 2m and 70cm feed points.\nOne can be constructed easily or purchased from numerous vendors for\n$30-80.\n\nGive full-duplex a try. You will not only help the satellite\ncommunity by eliminating unnecessary hetero-dyning tug-of-war, it will\ngenerally make you sound better on the birds! Oh, and use a pair of\nearphones or a headset when you give it a try to avoid feedback.\n\n73,\nClayton\nW5PFG\n\nHere are some more example full-duplex combinations:\n\nWouxon HT - Downlink\n2m only-HT - Uplink\n\nFT-60R - Uplink\nBaofeng - Downlink\n\nHandheld scanner - Downlink\nDual-band HT - Uplink\n\n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}