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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ZWD2D4DQW5W3YM3UJ7JLLIPR4XTYFXBI/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "ZWD2D4DQW5W3YM3UJ7JLLIPR4XTYFXBI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OQIERRWQPNBT7ZPMBN75WUIIKJO7RYLX/?format=api",
    "sender": {
        "address": "vk3jed (a) gmail.com",
        "mailman_id": "e049fcabdd4648088cd7ce227ab7c655",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/e049fcabdd4648088cd7ce227ab7c655/emails/?format=api"
    },
    "sender_name": "Tony Langdon",
    "subject": "[amsat-bb] Re: P3E transponder and launch",
    "date": "2007-03-23T21:31:49Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OQIERRWQPNBT7ZPMBN75WUIIKJO7RYLX/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "At 11:28 PM 3/23/2007, Patrick McGrane wrote:\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 \n>william Liejanier's transponder design.\n>I am of the belief that signal processing presents a loss in the \n>path, please correct me if I'm wrong.\n\nWhy would it be a loss?  SDR represents an opportunity to improve the \npassband characteristics, and increase the dynamic range of the \ntransponder, as well as make other tweaks.  Depending on the design, \nthere is also the potential to upload new passband characteristics \nand tweak the transponder while it's in space (sort of the equivalent \nto hitching a ride on a rocket and making a few tweaks :) ).\n\n>Williams Hamsat transponder is excellant and made me very interested in P3E.\n>Besides making the voice unnatural, are other modes allowed through \n>the SDR transponder?\n\nWhy would a SDR make voice unnatural?  All the SDR is doing is \nreplacing the traditional analog filters with digital ones, which \ngives much steeper skirts.  The DSP also offers the opportunity to \ndeal with alligators and maybe even dynamically share the transponder \npower equally between all stations.\n\n>Does the Helaps system compensate for the loss?\n\nHELAPS is a high efficiency linear PA.  Needed, regardless of whether \nthe transponder is analog or digital.\n\n>I'm of the Keep it simple discipline as once its up there nothing \n>can be done to fix it.\n\nOn the other hand, what the system offers is the potential to \ndynamically configure the passband.  Got non ham QRM sucking power \nfrom part of the passband?  Just notch it out, for example.\n\nWhile it is good to have old style analog transponders available as a \nstandby, we do need to look to the future and embrace new \ntechnology.  What is the point of spending millions and occupying our \nbands to put up another satellite with 1970's RF technology, when \nthere are experiments we can fly using the latest technology?  I have \nnothing against a tried and true analog transponder as a backup (if \nspace and weight constraints permit, that's prudent), but I do like \nto see new technology used as well.\n\n73 de VK3JED\nhttp://vkradio.com\n\n",
    "attachments": []
}