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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/56UCI2DNW3VI7EQNSNNJXVZ6LRAOJSFH/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "000301c7af8c$3baaccc0$0301a8c0@Shop", "message_id_hash": "56UCI2DNW3VI7EQNSNNJXVZ6LRAOJSFH", "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] CAN-Do noise problem is proving to be a difficult one to fix", "date": "2007-06-15T20:32:02Z", "parent": null, "children": [ "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EBNU4WUP4VNDD7L6H7P5AXO62VVQLL4H/?format=api" ], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "All,\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\n1) The CAN-Do module provides dirty power - both the +13 VDC output and\nthe ground are noisy\n\n2) The CAN-Do's switching power supply inductor, L3, radiates noise that\ncan affect 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", "attachments": [ { "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/56UCI2DNW3VI7EQNSNNJXVZ6LRAOJSFH/?format=api", "counter": 2, "name": "attachment.html", "content_type": "text/html", "encoding": "us-ascii", "size": 5459, "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/56UCI2DNW3VI7EQNSNNJXVZ6LRAOJSFH/attachment/2/attachment.html" } ] }