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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TTAXE4IAMYG3DK62OKWNABJJAHU5UYFR/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "TTAXE4IAMYG3DK62OKWNABJJAHU5UYFR",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/RQX4DLDIYY3MVVVNFRFO357N5UXLTUIQ/?format=api",
    "sender": {
        "address": "greencl (a) mindspring.com",
        "mailman_id": "5421c5ff9a12494f8f7bd304db4ac696",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/5421c5ff9a12494f8f7bd304db4ac696/emails/?format=api"
    },
    "sender_name": "Chuck Green",
    "subject": "[eagle] Re: CAN-Do-Too!   ??????????",
    "date": "2007-07-10T16:02:34Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/G6RVR67XIMLUOHSCXL3ICDWXMTYP43QS/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/G6NY5WBLSFVSUFBM7XXA2CQOAT3ME5MM/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/HXOOGW4YTIDHDT2OPUDHNDR75PHLZKYB/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5OMLS7GWEOXC54UEV6LHANKX2XHI6JC2/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Guys,\n\nI've collected a few topics from various peoples comments.\n\nThe CAN-Do! was designed to be mounted to the front wall of the module \nbox.  Since the connector could do this with the greatest simplicity, \nthat's the way we went.  Part of this had to do with minimizing the \nmodule volume used and part with heat conduction for the module power \nswitch transistor.  With the new mechanical configuration I have in \nmind, that will not be sufficient.  Mounting spacers to the module PCB \nwill likely be used.  But this is all preliminary thinking and any \nspecific suggestions would be appreciated.\n\nIt has been suggested that a DE-9 would be sufficient.  Technically, \nthis is correct.  But it would require the elimination of five of the \nsix user pins.  Maybe \"require\" is too strong a word.  Note that there \nare two CAN-H, two CAN-L, two power, and two ground (well, we ended up \nwith three grounds).  Technically, only one of each is needed.  But two \neach were were provided to simplify the construction of the wiring \nharness (no small issue).  The six user pins (one of them is named EB) \nwere for special needs a module might have.  Six may be overkill?  The \nnaming of one \"EB\" is a legacy from P3D where the engineering beacon was \nso pervasive throughout the satellite that it was decided to actually \nname one of the user pins as such.  Part of this is also driven by \nP3E/P5A perceived requirements.  P3E has used some of the user pins to \ninput structure thermistor signals to modules that do not otherwise use \nall of their analog input pins on the 40 pin connector.\n\nThe sub-miniature D connector series has served us well.  If anyone has \n*experience* with something they think might be a better choice, we'd \nlove to hear about it.\n\nThe switching frequency of approximately 5 kHz observed is not the \nnatural frequency of the existing supply.  It is likely the supply \nrunning in an idle mode since the actual power requirement of the widget \nis relatively small.  To verify this, Juan might try putting an \nadditional load on it. This can be done at the 40 pin connector.  In any \nevent, this points to the desirability for an experienced power supply \ndesigner re-designing the power supply.\n\nIt has been assumed, and enforced by the widget design, that a high \npower module would have a separate power input connector.  If switching \nsuch a module on/off by the IHU is desired, the widget switched power \nwould be used as a control line to switch the module power.  The widget \nis capable of supplying several amps to the module but the current limit \nis specified at under an amp as a \"normal\" module can only dissipate a \nlimited amount of heat anyway.  We also scaled the upper end of the \ncurrent measuring circuit at the specified current limit.  And we added \na two amp fuse.\n\nChuck\n",
    "attachments": []
}