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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/QFTGULHPSSWEOATELBIO7XT4LXGG6FBI/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000601c7af5d$28d3ffb0$0301a8c0@Shop",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/ODX4VHJ3ET6VHGXQZ5P3DW6JMDL27PKF/?format=api",
    "sender": {
        "address": "juan-rivera (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Juan Rivera",
    "subject": "[eagle] Re: Preliminary CAN-Do EMI Findings and Suggestions to\tMitigate in the 70 cm Receiver",
    "date": "2007-06-15T14:55:03Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PDLLFJYPYSTGW6BNTGNNJVO7NUVSFKCU/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/LFNAMHTZI3L6PEIIQFZRM6KNNULV632C/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
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    "content": "Jim and John,\n\n \n\nThis morning I want to physically move the PCB to the back of the enclosure,\nremount the CAN-Do module on the connector plate, and connect them with a\nshort ribbon cable.  I'll have that done in a few hours and post the results\nin my log.\n\n \n\nThen I'd like to try to filter the switched 13 volts from the module so the\nreceiver is spur-free and more or less configured the way I think it might\nneed to go.  Even if the receiver power bypasses the CAN-Do module it looks\nlike it needs to be able to function with dirty DC power so a simple filter\nwill probably be necessary in the next revision..\n\n \n\nAssuming that this removes the spurs from the IF output, that still leaves\nus with passband ripple and microphonics to deal with.  I'll remove the\nsuspect capacitors that John suggests first to see what affect that has on\nmicrophonics.  Then I can make John's suggested modifications to try to\nlearn more about the ripple.  The problem with these changes is that it will\nleave the receiver in a state where running the ATP might not be very\nuseful.  I think we might want to regroup after I make those changes and see\nwhat makes sense.  We might want to order some film caps to replace the\nceramic chips removed to chase the microphonics and see what John has in\nmind for the ripple before running the ATP.  This will push the ATP to the\nright by a few weeks but would probably result in more meaningful test\nresults.  What do you and John think?\n\n \n\nJuan\n\n \n\n  _____  \n\nFrom: Jim Sanford [mailto:[email protected]] \nSent: Friday, June 15, 2007 5:21 AM\nTo: [email protected]\nCc: [email protected]; David Smith; Dave Black (Work); Dave Black (Home);\nSamsonoff@Mac. Com; Juan.Rivera (Work)\nSubject: Re: [eagle] Preliminary CAN-Do EMI Findings and Suggestions to\nMitigate in the 70 cm Receiver\n\n \n\nJuan:\nAs usual, good work, and well documented -- thanks!\n\nWhat is your plan for proceeding to execution of the ATP?\n\nAfter you've developed a test configuraton and executed/documented the ATP,\nI'd like to see a single document, titled \"Recommended changes to design,\"\nwhich would be the single summary of all you've learned and would recommend\nwe do different in this design.  As always, I'm open to a better idea.\n\nTHanks & 73,\nJim\[email protected]\n\n\nJuan Rivera wrote: \n\nAll,\n\n \n\nI've completed a preliminary evaluation of the CAN-Do RFI problem.  Please\nsee my log for details by clicking here\n<http://www.juanr.com/pages/hobbies/ham_radio/Eagle/CAN-Do_Noise_Troubleshoo\nting.htm> .\n\n \n\n \n\nPreliminary Findings...\n\nThe spurs seen in the receiver IF enter the receiver in two ways\n\nAs radiation from the CAN-Do inductor\n\nVia CAN-Do module switched +14 VDC power on pins 39 and 40\n\nI/O line filtering appears to be unnecessary\n\nThe switched power from the CAN-Do module pins 39 and 40 must be filtered\n\nThe CAN-Do module will either have to be kept physically separated from any\nsensitive components, redesigned, shielded or a combination of the three.\n\nMoving the Can-Do module 2-1/4\" forward of its normal location on the\nreceiver PCB lowers the EMI level below the noise floor.\n\nSuggestions...\n\nCreate a full size PCB for the next generation receiver and shift the RF\ncomponents to the back of the board (away from the CAN-Do module.)\n\nAdd DC input filtering to the receiver\n\n73,\n\n \n\nJuan\n\nWA6HTP\n\n \n\n\n\n\n\n  _____  \n\n\n\n \n_______________________________________________\nVia the Eagle mailing list courtesy of AMSAT-NA\[email protected]\nhttp://amsat.org/mailman/listinfo/eagle\n  \n\n\n",
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