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{ "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/G33ZA3XQTIY7OC3HFIJPWIKW2EYQDLR7/?format=api", "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api", "message_id": "[email protected]", "message_id_hash": "G33ZA3XQTIY7OC3HFIJPWIKW2EYQDLR7", "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/KK75DA42V2CVIKOT3KCXESRATCF6E3X2/?format=api", "sender": { "address": "juan-rivera (a) sbcglobal.net", "mailman_id": null, "emails": null }, "sender_name": "Juan Rivera", "subject": "[eagle] Re: Phase noise", "date": "2007-06-11T21:03:20Z", "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WPZDLIR7AIZ5ME4EQKHVS534CPGY2SZL/?format=api", "children": [], "votes": { "likes": 0, "dislikes": 0, "status": "neutral" }, "content": "Folks,\n\nDon't forget that the 70 cm receiver also has an internal reference\noscillator than can be selected, at least in this current version. The\nphase noise of both oscillators need to be considered.\n\nJuan\nWA6HTP\n\n\nOn 6/11/07, Matt Ettus <[email protected]> wrote:\n>\n> Robert McGwier wrote:\n> > Thank you all for this great conversation. I want to remind everyone\n> > that we need long term coherence in the receiver, which can only be\n> > accomplished by low phase noise, not for the purity of the tone needed\n> > to be heard by a human ear, but by the need to correlate for long known\n> > symbols to recover frequency and timing in the SMS text messaging system\n> > and to do COHERENT detection of the symbols transmitted. We want the\n> > analog transponder to support this. This is also contributes to the\n> > requirement for a much larger dynamic range in the system than we have\n> > had heretofore on our spacecraft.\n> >\n>\n> This will be completely controlled by the master reference oscillator.\n> Are there specs for this? Is someone designing one?\n>\n> Matt\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", "attachments": [ { "email": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/G33ZA3XQTIY7OC3HFIJPWIKW2EYQDLR7/?format=api", "counter": 2, "name": "attachment.html", "content_type": "text/html", "encoding": "iso-8859-1", "size": 1767, "download": "https://mailman.amsat.org/hyperkitty/list/[email protected]/message/G33ZA3XQTIY7OC3HFIJPWIKW2EYQDLR7/attachment/2/attachment.html" } ] }