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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/2PGBN6LRA3QQ74MAPVMVJGJZ6AI5H3VJ/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "002101c7abd5$35adb9f0$0301a8c0@Shop",
    "message_id_hash": "2PGBN6LRA3QQ74MAPVMVJGJZ6AI5H3VJ",
    "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: Jim's Phase Noise Number!!",
    "date": "2007-06-11T03:04:20Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/3NQYJ7OLJMRQFOFSNI6DMKUTFUZQS3UH/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/VRTXAP7HKE3CD2EJOJUXHBO7NG3IO6GE/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
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    "content": "Jim and Bill,\n\n \n\nThank you for the compliments.  I'm having more fun with this little SDR\ntool that just about anything I've played with in a long time.  I just got\nstarted looking at EMI coming off of the CAN-Do module and I've already made\nan interesting discovery.  I made a hairpin single-loop sniffing coil a\nwhile ago out of a piece of coax to sniff the internals of the receiver and\nI already knew that it would also work at the low noise fundamental\nfrequencies that we're seeing from the CAN-Do module, so I pressed it back\ninto service.\n\n \n\nHolding the sniffer near the CAN-Do's inductor I see this:\n\n \n\n\n\n \n\nAs we already know, I can set the fundamental frequency by varying the input\nvoltage, so I set it to 50 kHz by adjusting the input to 13.69 volts.  I\nthen captured this display.  To my surprise the module jumps briefly to\nabout 57 kHz at regular intervals of about 3 seconds.  I think this has to\ndo with it resetting because it's not happy.  I've forgotten the details.\nMy next plan is to probe all 40 pins by using a 10x scope probe.  I'll start\nanother log called CAN-Do Noise and start posting there as I start on this\ntask.\n\n \n\n73,\n\n \n\nJuan\n\nWA6HTP\n\n \n\n \n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On Behalf Of\nJim Sanford\nSent: Sunday, June 10, 2007 7:46 PM\nTo: Bill Ress\nCc: [email protected]\nSubject: [eagle] Re: Jim's Phase Noise Number!!\n\n \n\nBill:\n\n-110 dbc/hz at 10khz offset is what I REMEMBER in my response to the \n\nquestion, \"What is a good phase noise number to shoot for in a microwave \n\nnarrowband (ssb/cw) system?\" \n\n \n\nMy memory may very well be WRONG, which was the point of asking my question.\n\n \n\nI agree with you, looks like -90dbC at 10 KHz, but given what Juan's \n\nalready said about his sources, and the uncertainties of the SDR-IQ, \n\nthat may be VERY good!\n\n \n\nDo you have a different answer to my original question, \"What is a good \n\nphase noise number to shoot for in a microwave narrowband (ssb/cw) \n\nsystem?\"    If so, I'd like to engage in that conversation, both for \n\nEagle and for my terrestrial microwave station.\n\n \n\nI agree with your assessment of Juan's work -- ABSOLUTELY EXEMPLARY!!!!!!\n\n \n\nThanks & 73,\n\nJim\n\[email protected]\n\n \n\n \n\nBill Ress wrote:\n\n \n\n> Jim,\n\n> \n\n> Where did the -110 dBC/Hz at 10 KHz come from? And at what frequency? \n\n> That's pretty aggressive using straight forward VCO's and PLLs. From \n\n> Juan's data with his snappy SDRIQ, it looks like that the 70 cm is \n\n> doing about -90 dBc/Hz at10 KHz. I thought that's what I read from his \n\n> early HP8566B dtata.\n\n> \n\n> My straight forward S2 RX downconverter PLL LO does -100 dBc/Hz at 10 \n\n> KHz.\n\n> \n\n> We'd better get a good read on this since, if real, it forces more \n\n> sophisticated LO designs.\n\n> \n\n> Great work Juan!!\n\n> \n\n> Regards...Bill - N6GHz\n\n> \n\n> \n\n> \n\n> Jim Sanford wrote:\n\n> \n\n>> \n\n>> I think I remember Bob's answer as -110dbc at 10 KHz offset.\n\n>> \n\n>> Thanks & 73,\n\n>> Jim\n\n>> [email protected]\n\n> \n\n> \n\n> \n\n_______________________________________________\n\nVia the Eagle mailing list courtesy of AMSAT-NA\n\[email protected]\n\nhttp://amsat.org/mailman/listinfo/eagle\n\n\n\n",
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