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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/C2W5HQVFEXFW5L36CTWSD2URLRK4UT2S/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "020d01d01505$83f73360$8be59a20$@net",
    "message_id_hash": "C2W5HQVFEXFW5L36CTWSD2URLRK4UT2S",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/C2W5HQVFEXFW5L36CTWSD2URLRK4UT2S/?format=api",
    "sender": {
        "address": "tjschuessler (a) verizon.net",
        "mailman_id": "e00b615eeb1940c790a22f139add6462",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e00b615eeb1940c790a22f139add6462/emails/?format=api"
    },
    "sender_name": "Tom Schuessler",
    "subject": "[amsat-bb] Design The Next AMSAT Satellite",
    "date": "2014-12-11T05:44:22Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/P3V6FLRGQIL3YRCXAJRGOQSU5SDINOYM/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello all,\n\nThis is relating to the brainstorming activity that AMSAT-NA is promoting to\ndesign the next AMSAT satellite.  I know there is lots of talk about using\n10Ghz for HEO birds doing yet to be developed digital communications modes\nthat can carry multitudinous amounts of digital communications on a\ntransponder, but I would like to reinvigorate a thread that Bob Brunnings,\nWB4APR tossed out over a year ago on this forum and have heard nothing about\nit since.  \n\nBob suggested a satellite that would have a linear to FM transponder\nspecifically to run PSK31.  This \"Analigital\" mode is very efficient in\nspectrum usage as anyone has seen during a contest like Field Day, where 30\nor more signals can coexist in a 3KHz chunk of 20 meters around 14.070.\n\nAs I remember his idea was to allow for uplink to the satellite on 2 meters\ninto a linear transponder with a downlink on FM 435Mhz.  The BFO audio\noutput would be decoded and re-applied to an FM (Always on) transmitter.\nBecause the output would be FM, the only hard Doppler correction would need\nto be on the uplink side and decode could be on nothing more than an HT\nconnected to a computer sound card with the only need to do the 2.5 or 5 Khz\nstep tuning we all use with our HTs for SO-50 passes to keep signals coming\nin clear.  Perhaps, and somebody could speak to this area, perhaps the\nuplink could be on the 10 meter satellite sub-band or an arranged portion of\nthe higher side of the 10 meter phone band, away from other terrestrial PSK\nactivity.  10 meter Doppler to the satellite would be quite small and would\nminimize the amount of AFC that the PSK RX software would have to negotiate.\nEven a non-full-length receive whip on the satellite should be able to pick\nup the uplink signals transmitted at normal PSK levels below 30 watts.\nlistening to the audio output of the FM radio, would make it easy to keep\nones drifting signal in place for decode.  The normal 3Khz bandwidth pass\nband for FM will work just wonderfully for PSK 31. For this up/down\nconfiguration In full duplex, you would be able to hear your own PSK signal\nand keep in place relatively easy with just a bit of practice.  Oh yeah,\nthere would be signals floating across the band but that is how it is now on\nSSB and CW when operators cannot use full computer aided correction.\n\nHere is the real plus to this idea;  We would open up the world of Amateur\nradio satellites to a whole new collection of operators around the world who\nlove these digital modes and would relish a challenge of learning how to do\nPSK in a different way.  It would be much more efficient than a pure FM\nvoice transponder yet it still will be VERY accessible to the vast majority\nof Hams like me who are under significant budgetary constraints on equipment\npurchases.  Also bringing satellite accessibility to a new segment of the\nHam community could increase the support level for AMSAT projects and that\nwould bring more dollars to build more elaborate ideas.\n\nI wonder if since Fox 1D is still uncommitted for launch if it could not be\nreconfigured to a 2 up SSB/70 down FM configuration to give this a try?\nMight be interesting.\n\nI really think Bob was on to something here and I have been surprised that\nnobody else has picked up on it or that I heard nothing about this coming\nout of the AMSAT Symposium that last October.\n\nHere's hoping that the discussion will continue and that we can see\nsomething like this get flown.  Just a few thoughts from a little guy.\n\n73 de Tom, N5HYP\n\n\n",
    "attachments": []
}