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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GR6DZFZDELSCNZ5KQVFZ5LQRBJT4EQA5/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "GR6DZFZDELSCNZ5KQVFZ5LQRBJT4EQA5",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/V77C3GIZS7JFLSQE5Y4SOEFI6VESXCMW/?format=api",
    "sender": {
        "address": "ve9qrp (a) gmail.com",
        "mailman_id": "4d6061838db34aba9a1c4722addebfaf",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/4d6061838db34aba9a1c4722addebfaf/emails/?format=api"
    },
    "sender_name": "Bruce Robertson",
    "subject": "[amsat-bb] Re: JUBILEE and other frustrations",
    "date": "2008-05-29T02:21:19Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/FEIYWLSF2R5B4S654XPOWHNXYPPNYB45/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Wed, May 28, 2008 at 8:17 PM, John Wright <[email protected]> wrote:\n>  >>SNIP\n>\n>\n>> > Honestly, if somebody has put a 45 kg amateur satellite into a 1,500 km\n>>plus orbit and has NOT included a\n>> > transponder,\n>\n> <<SNIP\n>\n> There seems to be a proliferation of satellites using the Amateur\n> bands as cheap down link frequencies,  and using Radio Amateurs as a\n> cheap way of collecting their data. It is MY personal belief that a\n> satellite should only use our hard-earned and much coveted\n> frequencies if they REALLY do carry an Amateur Radio payload... I.E.\n> a Transponder! , or, at the end of their commercial life, should be\n> put to real amateur use, I.E. a Transponder, promised several times\n> but not often delivered.\n>\n> OK there are many out there who get satisfaction from getting signals\n> from anything that is orbiting, to them, I raise my hat\n> BUT.. if it is in an amateur band, it should be a REAL amateur satellite.\n>\n> This is my view, and I stand here to be shot down.....\n>\n\nJohn:\n\nI'm not going to shoot you down. With some moderation, your views\nrepresent many of us. But I want to suggest another way forward, one\nthat is audible on our radios right now. Delfi C3 is a project that\nmakes a fair trade between the college projects' desire for data from\nour unequaled network of receiving stations and the amateurs' desire\nfor a transponder. Even if a few other cubesats go up at the same time\n-- and I have to confess that as a university professor (though in the\nhumanities), I love to collect telemetry from these, because I can\nimagine the enthusiastic young people behind them -- even if these\nothers without a transponder go up at the same time, we stand to\nbenefit greatly (admittedly, in LEO) from this sort of trade-off.\n\nI understand William PE1RAH is working on a transponder design that\nwill fit within the cubesat format, too.\n\nHere's my optimistic summary (again, apropos LEO). Cubesats have\ncreated a low-cost, frequent ride to space. The experimenters have\ndeveloped a standard ejection system, and a well-known set of\nparameters for power, etc. We know a linear transponder can ride on\none of these. At the same time, I'd say that on the whole our\ngroundstations are improving (with antenna design and low-noise\npreamps) that we can compensate slightly for lower power in space. We\nshould get behind these cubesat projects and be in the position to\noffer a SDX transponder that can, during their science phase, be used\nas a data downlink. Here: it's yours. Just let us turn on the\ntransponder in a year or so.\n\nI'll end with a challenge to continue this thread. Cubesats tend to be\nlaunched into low LEO orbits. What experimental schemes could be put\non board to boost their orbits, say to the height of FO-29? The ION\ncubesat was meant to look into alternate propulsion. These probably\nshould not be tried-and-true systems, since such would not be of\ninterest to the cubesat research teams. We offer the comms, we cheer\non the science, and even if the boost engine doesn't work, we have\nanother low LEO transponder.\n\n\n73, Bruce\nVE9QRP\n",
    "attachments": []
}