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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EWL5YVNEAKBZCXXZ37R5VIF7ZZ33PCPO/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "EWL5YVNEAKBZCXXZ37R5VIF7ZZ33PCPO",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KK75DA42V2CVIKOT3KCXESRATCF6E3X2/?format=api",
    "sender": {
        "address": "wb4gcs (a) amsat.org",
        "mailman_id": "87014499e012476c8198fad186f7f963",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/87014499e012476c8198fad186f7f963/emails/?format=api"
    },
    "sender_name": "Jim Sanford",
    "subject": "[eagle] Re: Jim's Phase Noise Number!!",
    "date": "2007-06-12T01:20:59Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7S4ARMGAAXQWDF2KLG2I3GVGSWWOVAFO/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/4F3UPNPKAW5AWY5NE4FWTH477HV2ATNA/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Juan:\nI have seen, in my professional life, a similar situation where an \ninductor was radiating noise with unacceptable impact.  Replacing the \ninductor with a shielded version was more effective than any overall \nshield, tho those did work.\n\nGood luck, and thanks again for all your hard work.\n\n73,\nJim\[email protected]\n\n\nJuan Rivera wrote:\n\n> Bdale,\n>  \n> Please refresh me on the function of the watchdog timer.  In the state \n> I was running, while observing the 3-second jumps, the receiver was \n> shut down but the CAN-Do module and dongle were both powered up (pins \n> 39 and 40 not connected to the receiver.)  I thought the module only \n> reset if it detected no heart beat from the dongle.\n>  \n> I think this evening I will fire up the receiver to recreate the noise \n> I've been seeing and then start playing with some brass sheet in front \n> of the inductor as a shield.  I tried probing all the pins with a 10x \n> scope probe connected to the SDR-IQ but I didn't see anything.  I'll \n> repeat that test with a 1x probe.  Based on last night I'm currently \n> thinking that the noise is radiated from that inductor rather than \n> conducted via the 40-pin connector.  There are receiver components \n> very close to that inductor.\n>  \n> 73,\n>  \n> Juan\n> WA6HTP\n>\n>  \n> On 6/11/07, *Bdale Garbee* <[email protected] <mailto:[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\n>     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\n>     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\n>     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\n>     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\n>     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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