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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/UNFNHLCUNXJ2ZKVQ56IBONR5J36DYTFF/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "000901c7af9c$c4cc70c0$0301a8c0@Shop",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/56UCI2DNW3VI7EQNSNNJXVZ6LRAOJSFH/?format=api",
    "sender": {
        "address": "juan-rivera (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Juan Rivera",
    "subject": "[eagle] Re: CAN-Do noise problem is proving to be a difficult one\tto fix",
    "date": "2007-06-15T22:30:22Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EBNU4WUP4VNDD7L6H7P5AXO62VVQLL4H/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/Y4KFGV5IGMHEQA2257XHRLNKDTXF65FK/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Jim,\n\n \n\nI'll need the CAN-Do folks to come up with a shielded inductor that will\nhave the same form, fit, and function.\n\n \n\nI know John has been working on a two-chassis implementation for the\nreceiver to try to get around the thermal issues that have been raised, but\nI am personally apprehensive due to the added complexity of any\ninterconnects that will be required.  I don't want to beat this milled\nchassis idea to death but it might be worth considering from a thermal\nstandpoint.  If you had enough thermal mass in the chassis perhaps it would\nnever have time to reach those extreme low temperatures during an eclipse,\nrendering the need for a two-chassis approach unnecessary.  It would\neliminate my concern about flexing and with a milled enclosure you could\nalso move the noisy CAN-Do module into a separate compartment and filter the\npower through the common wall.\n\n \n\nI've been thinking about DC power distribution in general.  Can someone\nexplain the plan for Eagle to me?  In aircraft, at least in the one I am\nfamiliar with, they do not use the chassis as a return.  All DC power is\ntreated the same way as AC power and distributed from a common point as a\ntwisted pair to minimize common mode noise.  Great care is taken to\neliminate ground loops by insuring that the ground returns are back through\nthe twisted pair to the source and not through a sneak path to the frame.\n\n \n\nJuan\n\n \n\n  _____  \n\nFrom: Jim Sanford [mailto:[email protected]] \nSent: Friday, June 15, 2007 2:16 PM\nTo: [email protected]\nCc: [email protected]; [email protected]\nSubject: Re: [eagle] CAN-Do noise problem is proving to be a difficult one\nto fix\n\n \n\nJuan:\nMy thoughts:\n1.  We must stop the radiated noise.  Let's try obtaining and placing a\nshielded inductor on the CAN-Do! module.\n2.  I just read a great suggestion from Lou, amplified by a phone call I\njust had with Rick, regarding three terminal filter devices.  Seems like a\ngood start.\n3.  I agree that we need to review the bidding on packaging.  That will\nprobably be the LAST of these issues we take on.\n\nThanks & 73,\nJim\[email protected]\n\n\nJuan Rivera wrote: \n\nAll,\n\n \n\nPlease see my write-up here\n<http://www.juanr.com/pages/hobbies/ham_radio/Eagle/CAN-Do_Noise_Troubleshoo\nting.htm> .\n\n \n\nThe CAN-Do noise is not lending itself to an easy cure.  I think this whole\nsubject of RFI/EMI needs to be looked at closely.  Every payload will be\naffected by noise on its inputs and can affect other payloads by creating\nnoise that is propagated back out from within its module chassis.\n\n \n\nWith the current scheme, of having a CAN-Do module located in the same case\nas the main payload, there are several issues that need immediate attention:\n\n \n\nThe CAN-Do module provides dirty power - both the +13 VDC output and the\nground are noisy\n\nThe CAN-Do's switching power supply inductor, L3, radiates noise that can\naffect sensitive circuits several inches away.\n\n \n\nBoth of these factors are adversely impacting the 70 cm breadboard receiver\nin the form of 5 kHz spurs on the IF output.  As I mentions earlier, Rather\nthan work to clean up the CAN-Do module immediately, we should focus on\nmaking the receiver function In the presence of this noise.  This approach\nwill result in a more robust design.  The CAN-Do module needs to be cleaned\nup, but for now it acts as a great real-world noise generator.\n\n \n\nI'm currently out of ideas.  I'd like to hear what you all have to say.\n\n \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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