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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/A2YH4X26LCSZEI3UQ22CGX37HGXMQ63Z/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "A2YH4X26LCSZEI3UQ22CGX37HGXMQ63Z",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PFUGZ676R3TJDCZDCVW676TCFQKJQ2C2/",
    "sender": {
        "address": "greencl (a) mindspring.com",
        "mailman_id": "5421c5ff9a12494f8f7bd304db4ac696",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/5421c5ff9a12494f8f7bd304db4ac696/emails/"
    },
    "sender_name": "Chuck Green",
    "subject": "[eagle] Re: 70 cm Receiver IF Spurs - Problem Solved",
    "date": "2007-06-18T00:51:16Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PFUGZ676R3TJDCZDCVW676TCFQKJQ2C2/",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/6DQEIUJRV6FHNCGPCU7KWYKUYDVCGGKF/",
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/NTVWS5O3UGOSFMWXCYKYSRLLDLTSI3T3/"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Juan,\n\nOne of the purposes of the CAN-Do! was to provide a standard interface \nso that a module couldn't do something nasty and take out the entire \nsatellite.  So custom mods to the CAN-Do! are not allowed.  Having said \nthat, we have always assumed that a jumper across the CAN-Do! power \nswitch would be installed for those modules that needed to be powered up \nno-matter-what.\n\nChuck\n\nJuan Rivera wrote:\n> Chuck,\n>\n> I don't want to tear into the CAN-Do module.  I feel like it is a loaner and\n> not mine to modify.  It would be interesting to disconnect the switch and\n> the current monitor from the CAN-Do power input and move it to those user\n> pins as you suggest.  That might just work, but I also know they don't want\n> to have multiple versions of the module floating around and this would be\n> one.\n>\n> We also can't loose sight of the radiated noise from that inductor.  I can\n> see signs of EMI if it gets within 2 inches of the sensitive areas of the\n> receiver.\n>\n> 73,\n>\n> Juan\n>\n>\n> 73,\n>\n> Juan\n>\n> -----Original Message-----\n> From: Chuck Green [mailto:[email protected]] \n> Sent: Sunday, June 17, 2007 9:18 AM\n> To: [email protected]\n> Subject: Re: [eagle] 70 cm Receiver IF Spurs - Problem Solved\n>\n> Hi Juan,\n>\n> I am impressed with your testing and analysis. \n>\n> I find it curious that you were unable to filter the power from the \n> CAN-Do! .  But switching noise is notorious for being difficult to \n> filter.  So maybe that is something to just forget. But in a total \n> system (satellite) it may not be possible to forget.  We may need to \n> find a way to filter the power for sensitive modules even if not using \n> power from the CAN-Do! ; in which case, such a filter may also filter \n> the noise from the CAN-Do! .\n>\n> If your analysis is correct, and it certainly seems to be, then it would \n> also seem possible to remove the switch from the CAN-Do! (not just \n> bypass it) and rout your clean power source through the CAN-Do! current \n> measurement circuit thus saving having to do this in the module.\n>\n> Great work!  And thanks.\n>\n> Chuck\n>\n>\n>\n> Juan Rivera wrote:\n>   \n>> Hi Chuck,\n>>\n>> Bad news I'm afraid.  See my report for details...  I've sent out a link\n>>     \n> to\n>   \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>>     \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>   \n>> ting.htm> \n>>   \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>\n>   \n",
    "attachments": []
}