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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NHYYPM6N6LQDCXSBS6CQ5NW2M5BMYQOA/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "NHYYPM6N6LQDCXSBS6CQ5NW2M5BMYQOA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/NHYYPM6N6LQDCXSBS6CQ5NW2M5BMYQOA/",
    "sender": {
        "address": "jrivett (a) drivehq.com",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "[email protected]",
    "subject": "[amsat-bb]  Full Duplex  vs Cross Band -  definitions",
    "date": "2009-06-03T09:21:24Z",
    "parent": null,
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Sil,\n\n \nIn the world of  data comms (not radio),  the meanings of  terms are generally as follows :\n \nSimplex = One direction only  ( A to B only, never in the other direction )  eg a broadcast,  NOAA WX stations, etc\n\nHDX  Half Duplex  =  Alternating on both directions,  e.g   A to B,  turnaround,  B to A, turnaround, A to B, and so on .....\n\nFDX  Full Duplex  =  simultaneously in  both directions at same time,  A to B  AND  B to A.  \n \nFor Simplex and for HDX  only 2 wires (baseband) or 2  FSK frequencies are enough. \nTX and RX dont clash, because they are used Alternately, like a single track railway.\n\nTurnaround Time was always an important factor, because it slowed down the total amount of data  transferred per hour, and required careful synchronisation of modem turnarounds at both ends.\n \nFor Full Duplex FDX you need a 2 track railway, or 4 wires, or 4 FSK frequencies, which can send and receive at the same time, for trains to go in both directions, for cars to pass on an an ordinary road, for data to pass (ignoring phase modulation and other techniques.)\n \nSimplex,  HDX and FDX have nothing to do with Cross-Band working.  \n\nCross-Band is a completely separate and additional requirement.\n  \nFM Repeaters often are FDX with frequencies only 600 khz apart,  which is Same-Band FDX in the repeater-radio  (and used in HDX mode by human users with HDX radios). \n  \nHumans using Satellites at VHF and UHF for Simultaneous Up and Down links,  require radios with FDX  and Cross-band functions.  \n \nTo summarise,  for sat operations, two different functions are required of a radio,\nFDX  and Cross-Band working. \n \nCombining  these 2 separate function names  into one name seems to confuse the matter.\n \n 73\n \n de M3RRX\n \n\n\n",
    "attachments": []
}