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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ATWT7XSUHUUJ63FQODKBA7RN7SINSJ6S/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "ATWT7XSUHUUJ63FQODKBA7RN7SINSJ6S",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/TFOD7M3R4LQVRQ5ZCMTD3OOAVHUW45YK/?format=api",
    "sender": {
        "address": "jim (a) k6ccc.org",
        "mailman_id": "bbef5a4ab75c469480d488c236da0616",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/bbef5a4ab75c469480d488c236da0616/emails/?format=api"
    },
    "sender_name": "Jim Walls",
    "subject": "Re: [amsat-bb] FW: [FWD: RE:  Southern CA Satellite Presentations]",
    "date": "2016-06-28T15:33:50Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TFOD7M3R4LQVRQ5ZCMTD3OOAVHUW45YK/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Jerry Conner said (in part):\n > I have a hard time with all the purest, my way or the highway mentality \nI am hearing.\n  \n  \n It's not that it's a elitist mentality, it's simply a technical \nrequirement for successful operation.  Even on a FM satellite, operating \nwithout full duplex would be about like trying to use your local 2M \nrepeater with a transmitter and no receiver turned on until AFTER you \ncalled someone.  You have no way of knowing if someone else is talking.  \nSince on most FM satellites, the idle time between conversations is \nmeasured in milliseconds, your chances of successfully hitting an idle spot \nwithout knowing if your are getting through is quite slim.  On SSB or CW on \na linear satellite, without full duplex, you will forever be chasing trying \nto figure out where your downlink is.  Even with complete computer control \nof dopler shift, you will still be chasing the other guy.\n  \n On an FM satellite, the situation goes something like this.  A contact \nends, and for example three people key up to make a call at essentially the \nsame time.  Depending on signal levels, maybe one person has a strong \nenough signal to capture everyone else, but more likely there is a massive \nhetrodyne between several signals.  With  everyone operating full duplex, \nwe all hear that either someone else is capturing the uplink or the \nhetrodyne and drop carrier.  If you're not using full duplex, you blindly \nkeep transmitting and creating interference for the rest of the users.\n  \n The exception to all this is that if you are operating in a location that \nhas almost no one to talk to (Hawaii comes to mind) since you are almost \nthe only one around, you might get away without full duplex most of the \ntime.  A decade or so ago, every night there was a SE to NW pass that was \nwell off the southern California coastline - such that the footprint only \ncovered 50 - 100 miles along the coast.  There were a small enough number \nof us in the footprint that we could actually hold several minute \nconversations with one or two other people.  Non full duplex would likely \nhave worked in that case.  However for the previous pass that covered most \nof the US, I would not have even considered it.\n  \n BTW, note that in my first sentence, I said \"it's simply a technical \nrequirement for successful operation.\"  The key word there was successful.  \nWithout full duplex you will occasionally make a contact (especially as \nmentioned earlier if you are almost the only person in the footprint), but \nif you want to routinely be successful on busy passes, there is no \nalternative to being full duplex.  Period.\n  \n  \n Jim Walls - K6CCC\n  \n\n",
    "attachments": []
}