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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/KRVBWUOEWZGEKWQZNYIPRYUF4VOJGJEY/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "KRVBWUOEWZGEKWQZNYIPRYUF4VOJGJEY",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/OABE3MIGX3YDWBRWF3CV6DOFYWJA7UJG/?format=api",
    "sender": {
        "address": "bdale (a) gag.com",
        "mailman_id": "805200a293b9433cb2f9596737eedb92",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/805200a293b9433cb2f9596737eedb92/emails/?format=api"
    },
    "sender_name": "Bdale Garbee",
    "subject": "[eagle] Re: CAN-Do noise abatement plan and questions",
    "date": "2007-06-13T14:09:10Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OABE3MIGX3YDWBRWF3CV6DOFYWJA7UJG/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/D5NPSYECCAB7AFPJOXP4Y2GPKKIDJYJX/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "On Wed, 2007-06-13 at 05:06 -0700, Juan Rivera wrote:\n> Good morning Stephen,\n\nI happen to be online earlier than Stephen today, due to being in\nAtlanta on business, so let me provide some replies and he can chime in\nlater if I miss anything.\n\nAnd by the way, sorry about missing the TeamSpeak meeting last night.  I\nwas at dinner with a number of customers in Atlanta, and then realized\nthe notebook I'm using now does not have a built-in microphone (and I'm\nnot in the habit of traveling with a headset... should probably fix\nthat!).\n\n> 1)      What if the CAN-Do module suffers a failure that causes a\n> current overload?  Is it protected by a fuse?  The next generation\n> receiver should continue to function as long as it has power.  An\n> overload in either unit should not cause the other to fail.\n\nThere is no fuse on the CAN-Do! widget.  A sufficiently bad short would\nprobably cause a trace to cook acting as a fuse, but all of the active\ncircuitry is downstream of the switching regulator and thus fairly well\nisolated from the spacecraft power bus in case of failure anyway.  Since\nyou'll be bypassing the power switch on the CAN-Do! widget anyway, I\ndon't think we have any significant coupled-failure scenarios.\n\n> 2)     Do you have any information of previous efforts to reduce\n> CAN-Do noise by either shielding the module or replacing the inductor\n> with a shielded version?\n\nNo.  As I indicated in my email the other day, you are the first person\nintegrating a CAN-Do! widget with an RF payload module... at least that\nwe've had any feedback from.\n\n> 3)     Do you have a shielded inductor that I could swap for the\n> existing one if that proved necessary?\n\nNo.  And frankly, solutions that involve *any* modification of the\nCAN-Do! widget boards at this point are going to be problematic, since\nall of the flight units have already been manufactured and functionally\ntested.  That's not to say that we *can't* change the CAN-Do! widgets,\nbut given the relatively small number of the total that are likely to\nend up in RF modules, choosing a solution that allows the CAN-Do! widget\nboard to be used as-is may be a better systems-level design decision.  \n\n> 4)     Have you designed a circuit that would allow temperature to be\n> determined inside the receiver PCB itself, and not just on the CAN-Do\n> module?  This will be important, especially if the receiver is split\n> into two separate enclosures.\n\nNot specifically, but AMSAT has significant experience with a specific\nmodel of YSI 3-lead thermistor, and some thoughts have accumulated in\nthe folklore over time about other alternatives.  I'm sure Lyle or\nothers on-list can provide a suitable circuit example for you to use if\nthat becomes necessary.\n\n> My plan is ...\n\nSounds good.  Looking forward to hearing what you learn!\n\n> One last question…  How do I reduce the heartbeat timing below three\n> seconds?  I couldn’t find any way to do that using the net controller.\n> I’d like to confirm that the jump in frequency I see in the CAN-Do\n> module’s 5 kHz noise every three seconds goes away.\n\nI'll let Stephen answer that, since I don't use Windows and thus haven't\nrun his recent software that I suspect you're using other than under his\ndirect supervision...  ;-)\n\nBdale\n\n\n\n",
    "attachments": []
}