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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ENGSDOZ3YZDQQWIOESSX6UP6W6WINJXU/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "ENGSDOZ3YZDQQWIOESSX6UP6W6WINJXU",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OQIERRWQPNBT7ZPMBN75WUIIKJO7RYLX/?format=api",
    "sender": {
        "address": "broberts (a) mta.ca",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Bruce Robertson",
    "subject": "[amsat-bb] Re: P3E transponder and launch",
    "date": "2007-03-23T13:29:54Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OQIERRWQPNBT7ZPMBN75WUIIKJO7RYLX/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/D4FFDCJ4JAMZBF3FT5IZTK52D2X7EKBF/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PW4WNC5FEVYLOIEHH2RYOEDLVMFEE3VC/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Quoting Patrick McGrane <[email protected]>:\n\n> Greetings from pat n2oeq\n> \n> I have been looking forward to the launch of P3E which I thought was\n> going to be this year.\n> I am concerned about the germans use of the SDR technology over william\n> Liejanier's transponder design.\n> I am of the belief that signal processing presents a loss in the path,\n> please correct me if I'm wrong.\n> Williams Hamsat transponder is excellant and made me very interested in\n> P3E.\n> Besides making the voice unnatural, are other modes allowed through the\n> SDR transponder?\n> Does the Helaps system compensate for the loss?\n> I'm of the Keep it simple discipline as once its up there nothing can be\n> done to fix it.\n> \n> If amsat-dl is monitoring , please update your website and provide a\n> direct Paypal donation utility.\n> \n> Thanks to amsat-na for the donation to P3E recently. 73, pat\n> \n\nThe amsat-dl article \"Launches Speak Louder Than Words\", published in May 2006\nhttp://www.amsat-dl.org//index.php?option=com_content&task=view&id=65&Itemid=97\nnoted that Nov. 2008 was the first relatively secure date. I believe more\nrecent sources have suggested that the bird will be ready in Spring or\nSummer of this year. Perhaps there is some hope that a more recent launch\nopportunity will arise.\n\n>From my reading, and I'm not an expert, SDX technology is predicted to be\nindistinguishable from a linear xponder to the ground station: I have read\nno account of entailed losses. What it *does* aim to provide is a newly\nflexible and configurable bent pipe. One obvious application is to limit\nthe amount of output power in a given portion of the passband, thereby\nreducing the impact of alligator stations. The audio files posted on this\nlist indicate no unnatural artifacts to my ear, and such transponders are\nroutinely built to operate with varying modulation schemes. \n\nAs this technology matures, one could imagine groundstations developing\n'applets' for the SDX. For instance, imagine an bit of SDX code that\nlistens on a certain very small passband and responds to any CW signal with\na report that indicates that signal's average power in dBm or dB above\nnoise, or what have you. This would be an invaluable tool for calibrating a\nstation! What if the report were sent three times, each signal 10 dB lower\nthan the previous (something like the IARU beacons); then you'd have some\nhard numbers on how your Field Day station was performing on both uplink\nand downlink.\n\nMy point is that SDX allows us to dream of these things, and potentially to\nimplement them even after the bird is up. Yes, it entails a risk. We're\nfortunate to be able to mitigate this risk: SuitSatII will fly with SDX\non-board so that we can test this technology. To my mind, the  satellite\nservice/hobby is a branch of the hobby that continues to fulfill the\nexperimental origins of amateur radio. We need to do so prudently, given\nthe cost of launching the hardware into space, but I think the SDX concept\nfits nicely within that curve.\n\n\n73, Bruce\nVE9QRP\n",
    "attachments": []
}