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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/EI5XM5AS4IW3ATXMPLVQVZ7OCHQLIR6T/?format=api",
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    "message_id": "000001c7bd36$254067d0$0301a8c0@Shop",
    "message_id_hash": "EI5XM5AS4IW3ATXMPLVQVZ7OCHQLIR6T",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/EI5XM5AS4IW3ATXMPLVQVZ7OCHQLIR6T/?format=api",
    "sender": {
        "address": "juan-rivera (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Juan Rivera",
    "subject": "[eagle]  70 cm Receiver Frequency Stability and One More Glitch",
    "date": "2007-07-03T05:51:03Z",
    "parent": null,
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TTUG7BSXMMN4EL56AF4GQCQXVXCVNVM5/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "All,\n\n \n\nHere's a plot of frequency drift in the 70 cm Receiver - first on internal\nreference, then on external reference:\n\n \n\n\n\n \n\nThe first part of the plot is with the receiver and the signal generator set\nto 435.500000 MHz on internal reference.  You can see the slow steady drift\nupwards of about 15 Hz over a period of about 5 minutes.  Then I\nreinitialized the receiver for the external reference.  It locked right up\nand the output was exactly 10.700000 MHz where it stayed.\n\n \n\nThe most important thing I noticed is not on this graph.  With internal\nreference selected, but while feeding 10 MHz into the external reference\ninput, (as it might be configured in flight) the two reference signals are\nbeating together.  It wasn't until I started listening to the output of the\nreceiver by patching it into a distribution amplifier so I can feed my\ncounter, the SDR-IQ, the TS-2000, and the HP 8566B all at once that I\nnoticed it.  The result is that the input signal is FM modulated by the beat\nbetween the two reference oscillators.  I also noticed some unexplained\njumps in frequency that I have not yet been able to capture.  I'll dig into\nthis again when I have more time.\n\n \n\n73, Juan\n\n \n\n \n\n\n\n",
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