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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PFUGZ676R3TJDCZDCVW676TCFQKJQ2C2/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "000e01c7b10a$44cb4530$0301a8c0@Shop",
    "message_id_hash": "PFUGZ676R3TJDCZDCVW676TCFQKJQ2C2",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PFUGZ676R3TJDCZDCVW676TCFQKJQ2C2/",
    "sender": {
        "address": "juan-rivera (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Juan Rivera",
    "subject": "[eagle] Re: 70 cm Receiver IF Spurs - Problem Solved",
    "date": "2007-06-17T18:06:45Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/A2YH4X26LCSZEI3UQ22CGX37HGXMQ63Z/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Chuck,\n\nI don't want to tear into the CAN-Do module.  I feel like it is a loaner and\nnot mine to modify.  It would be interesting to disconnect the switch and\nthe current monitor from the CAN-Do power input and move it to those user\npins as you suggest.  That might just work, but I also know they don't want\nto have multiple versions of the module floating around and this would be\none.\n\nWe also can't loose sight of the radiated noise from that inductor.  I can\nsee signs of EMI if it gets within 2 inches of the sensitive areas of the\nreceiver.\n\n73,\n\nJuan\n\n\n73,\n\nJuan\n\n-----Original Message-----\nFrom: Chuck Green [mailto:[email protected]] \nSent: Sunday, June 17, 2007 9:18 AM\nTo: [email protected]\nSubject: Re: [eagle] 70 cm Receiver IF Spurs - Problem Solved\n\nHi Juan,\n\nI am impressed with your testing and analysis. \n\nI find it curious that you were unable to filter the power from the \nCAN-Do! .  But switching noise is notorious for being difficult to \nfilter.  So maybe that is something to just forget. But in a total \nsystem (satellite) it may not be possible to forget.  We may need to \nfind a way to filter the power for sensitive modules even if not using \npower from the CAN-Do! ; in which case, such a filter may also filter \nthe noise from the CAN-Do! .\n\nIf your analysis is correct, and it certainly seems to be, then it would \nalso seem possible to remove the switch from the CAN-Do! (not just \nbypass it) and rout your clean power source through the CAN-Do! current \nmeasurement circuit thus saving having to do this in the module.\n\nGreat work!  And thanks.\n\nChuck\n\n\n\nJuan Rivera wrote:\n> Hi Chuck,\n>\n> Bad news I'm afraid.  See my report for details...  I've sent out a link\nto\n> the group.\n>\n> 73,\n>\n> Juan\n>\n> -----Original Message-----\n> From: Chuck Green [mailto:[email protected]] \n> Sent: Saturday, June 16, 2007 8:57 AM\n> To: [email protected]\n> Cc: [email protected]; David Smith; Dave Black (Work); Dave Black (Home);\n> Samsonoff@Mac. Com; Juan.Rivera (Work)\n> Subject: Re: [eagle] 70 cm Receiver IF Spurs - Problem Solved\n>\n> Hi Juan,\n>\n> This is fantastic! \n>\n> Please try one more experiment.  Pass the module current through the \n> current measuring circuit on the CAN-Do! while bypassing the switch \n> transistor (you could just short across the switch transistor) and see \n> if the problem reappears. \n>\n> If you end up having to use the user pins, you will need to add current \n> measuring circuitry to your module.  While this is no big deal, its one \n> more thing you might not have to do.\n>\n> Chuck\n>\n> Juan Rivera wrote:\n>   \n>> All,\n>>\n>>  \n>>\n>> The 70 cm Receiver spur problem has been solved.  Click here \n>>\n>>     \n>\n<http://www.juanr.com/pages/hobbies/ham_radio/Eagle/CAN-Do_Noise_Troubleshoo\n> ting.htm> \n>   \n>> for details.\n>>\n>>  \n>>\n>> 73,\n>>\n>>  \n>>\n>> Juan\n>>\n>> WA6HTP\n>>\n>> ------------------------------------------------------------------------\n>>\n>> _______________________________________________\n>> Via the Eagle mailing list courtesy of AMSAT-NA\n>> [email protected]\n>> http://amsat.org/mailman/listinfo/eagle\n>>   \n>>     \n>\n>\n>\n>   \n\n\n",
    "attachments": []
}