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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7ACRWYARJ7W7RGBUAHXWBPC4E7PDSUQJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "7ACRWYARJ7W7RGBUAHXWBPC4E7PDSUQJ",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/YN4VFAPBSRDQ266PENZ5YQG2J3KE5IRQ/?format=api",
    "sender": {
        "address": "vk3jed (a) gmail.com",
        "mailman_id": "e049fcabdd4648088cd7ce227ab7c655",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e049fcabdd4648088cd7ce227ab7c655/emails/?format=api"
    },
    "sender_name": "Tony Langdon",
    "subject": "[amsat-bb] Re: true duplex radios",
    "date": "2009-06-02T20:59:46Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KKFXCIO3KILBWWJN4YEWE3L76T6OSXHC/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 05:02 AM 6/3/2009, Martin wrote:\n>Hi Jim and others.\n>\n>For ordinary Repeaters the Rx/Tx in the same band is mandatory. But just\n>think of the filtering needed for TX'ing lots og watts just 600kHz away\n>from your Rx-frq.\n>This is also the reason why most repeaters (at least that I know of)\n>uses really big cavity-filters.\n\nEither that or _very_ widely spaces antennas.  For example, to avoid \nthe need of rather large cavities, 10m repeaters often use two sites, \nlinked by UHF, to separate Rx and Tx.\n\n\n>But for Rx/Tx on the same frequency - Forget it. What would be the\n>purpose anyway?\n\nNice way to create a feedback loop. :D  You can create an appearance \nof full duplex by using a high speed switching scheme on a digital \ntransmission.  In fact, this is exactly what happens if you run \nEcholink over a wifi connection.  The radio itself is half duplex, \nsingle frequency, but the high data rate and fast T/R switching allow \nfull duplex for any VoIP on top of it, at the price of a tiny amount \nof latency.\n\n\n>In my terms, a full-duplex radio is a radio that listens on one band,\n>whilst transmitting on another.\n\nNope, full duplex refers to any communication channel capable of \ntransmitting and receiving information simultaneously.  While I know \nof no radio capable of running full duplex on the same frequency, as \nsomeone pointed out, the humble analog (landline) telephone does exactly that.\n\n73 de VK3JED / VK3IRL\nhttp://vkradio.com\n\n",
    "attachments": []
}