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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7S4ARMGAAXQWDF2KLG2I3GVGSWWOVAFO/?format=api",
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    "message_id": "[email protected]",
    "message_id_hash": "7S4ARMGAAXQWDF2KLG2I3GVGSWWOVAFO",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KK75DA42V2CVIKOT3KCXESRATCF6E3X2/?format=api",
    "sender": {
        "address": "juan-rivera (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Juan Rivera",
    "subject": "[eagle] Re: Jim's Phase Noise Number!!",
    "date": "2007-06-11T21:12:21Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VRTXAP7HKE3CD2EJOJUXHBO7NG3IO6GE/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/5MCQNKRKPC4WUFKHRKTB4HCW6DGIMCQG/?format=api",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EWL5YVNEAKBZCXXZ37R5VIF7ZZ33PCPO/?format=api"
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    "content": "Bdale,\n\nPlease refresh me on the function of the watchdog timer.  In the state I was\nrunning, while observing the 3-second jumps, the receiver was shut down but\nthe CAN-Do module and dongle were both powered up (pins 39 and 40 not\nconnected to the receiver.)  I thought the module only reset if it detected\nno heart beat from the dongle.\n\nI think this evening I will fire up the receiver to recreate the noise I've\nbeen seeing and then start playing with some brass sheet in front of the\ninductor as a shield.  I tried probing all the pins with a 10x scope probe\nconnected to the SDR-IQ but I didn't see anything.  I'll repeat that test\nwith a 1x probe.  Based on last night I'm currently thinking that the noise\nis radiated from that inductor rather than conducted via the 40-pin\nconnector.  There are receiver components very close to that inductor.\n\n73,\n\nJuan\nWA6HTP\n\n\nOn 6/11/07, Bdale Garbee <[email protected]> wrote:\n>\n> On Sun, 2007-06-10 at 20:04 -0700, Juan Rivera wrote:\n> > To my surprise the module jumps briefly to about 57 kHz at regular\n> > intervals of about 3 seconds.\n>\n> Yes, that's the watchdog timer firing and causing a software reset.  I\n> have no doubt that the reset cycle causes a short-term variation in the\n> current consumption profile on the board itself.  If the frequency is\n> power consumption dependent, note that it's likely to move around a bit\n> during normal operation... might want at some point to look at\n> conditions with the CAN-Do! running at a \"normal\" 20ms update rate.\n>\n> > My next plan is to probe all 40 pins by using a 10x scope probe.  I'll\n> > start another log called CAN-Do Noise and start posting there as I\n> > start on this task.\n>\n> As Lyle pointed out in an off-list email, the power supply on the\n> CAN-Do! widget was designed to be efficient, not necessarily to be\n> quiet.  Switchers always have noise issues... we've flown a lot of them,\n> and this isn't the first time some filtering or shielding has been\n> required to keep everything happy.   You're doing the right things to\n> characterize what's going on, and we'll all help if/as needed.\n>\n> We (the CAN-Do folk) are following your progress with great interest.\n> Augmenting the CAN-Do! documentation with some summary of your findings\n> and mitigation approach to aid future users is something we'll look\n> forward to doing.\n>\n> Bdale\n>\n>\n>\n\n\n",
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