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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/GSSBHN52EIWTG3EA4JJO6YAQE3NL5XJI/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "GSSBHN52EIWTG3EA4JJO6YAQE3NL5XJI",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/AMZGDYJTDVRYUX2WF3QHR6TONUWEXQPV/",
    "sender": {
        "address": "matt (a) ettus.com",
        "mailman_id": "fcfbe2ace2e140b5be16e4b6f8dcea6b",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/fcfbe2ace2e140b5be16e4b6f8dcea6b/emails/"
    },
    "sender_name": "Matt Ettus",
    "subject": "[eagle] Re: [Fwd: [amsat-bb] Re: S band downlink on P3E]",
    "date": "2006-09-08T22:33:57Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QBIE4P4HVO2VOIYOEOS2UON4MPIV34AU/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": ">\n>\n> The point here is to open this up to\n>people who won't, and would have more interference problems, since they\n>live in denser areas and can't put up big dishes with lots of\n>directional gain.\n>  \n>\n>\n>San Mateo has almost a million people in a 12 mile radius.  I get no \n>little inteference in the lower S band, and only a very small amount \n>of popping (that my DSP removes completely) in the upper S band.  So \n>I personally need more convincing that this isn't a problem.  At \n>worse we may have to convince our members to buy better \n>downconverters or add on notch filters so that their wideband \n>downconverters don't suck up noise from outside the band.  But \n>telling people to get a filter isn't a big inconvenience.  It's been \n>done before.\n>\n>  \n>\nOnly the upper S-band is a satellite band.  If you get \"pops\" in a \nnarrowband receiver, chances are that the noise is bad enough to make \nproblems for a wideband receiver trying to receive signals at the \nbackground noise level.  You can't use a notch filter if the \ninterference is wideband and is on the wideband channel you are trying \nto receive.\n\n>>3 - Could you justify putting up an X million dollar satellite that uses\n>>a band which is questionable at best, just because some complainers who\n>>don't actually volunteer to do anything say that it works for them?\n>>    \n>>\n>\n>I think this is a very good question - so if that is the argument, \n>why would you put up a mode U/V transponder?  It's as usable as mud \n>in a gas tank.\n>  \n>\nIf it were up to me, we wouldn't....\n\n>  \n>\n>>4 - Why should we have to justify why we're not using a band?\n>>    \n>>\n>\n>There are several reasons.  The first is because we have spectrum \n>allocated there, and if we don't use it we simply lose it.  In the \n>future we may need to rely upon it.\n>\nWhat band aren't we using?  We're using S-band for uplink instead of \ndownlink, bet we're still using it.  How does that cause us to lose \nspectrum?\n\n>The other reason is because the people who bought into the technology \n>5-10 years ago have an investment that hasn't yet been fully \n>realized.  I don't want to go down the road questioning the judgement \n>of people who told our customer base to go down the road, but if it \n>was flawed we haven't told people we are sorry.  It's also why none \n>of the commercial broadcasters cut off analog TV transmissions when \n>the FCC set the 2006 deadline.  People hang on to technology.\n>\n>  \n>\n>> As we\n>>agreed at the SD meeting, we are looking at providing _services_ and the\n>>best way to do that, not how to best make use of old hardware, which\n>>wouldn't be usable anyway.\n>>    \n>>\n>\n>I wasn't invited to that meeting, but can you tell me why you don't \n>think it wouldn't be usable?  I think that is a very bad assumption.\n>  \n>\nIt wouldn't be usable, not because of interference.  it wouldn't be \nusable because this is a wideband digital system, not the kind of thing \nwhere you just hook a downconverter up to your Icom.  You need special \nhardware all the way from the antenna to the backend.\n\nMatt\n\n",
    "attachments": []
}