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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/OFZU543NARINDRRIXI3W7UL32Q7I2P7A/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "OFZU543NARINDRRIXI3W7UL32Q7I2P7A",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/EI5XM5AS4IW3ATXMPLVQVZ7OCHQLIR6T/?format=api",
    "sender": {
        "address": "wb4gcs (a) amsat.org",
        "mailman_id": "87014499e012476c8198fad186f7f963",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/87014499e012476c8198fad186f7f963/emails/?format=api"
    },
    "sender_name": "Jim Sanford",
    "subject": "[eagle] Re: 70 cm Receiver Frequency Stability and One More Glitch",
    "date": "2007-07-03T22:26:50Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/TTUG7BSXMMN4EL56AF4GQCQXVXCVNVM5/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Bill:\nAs I understand the functionality you have in the S2 receiver in this \nregard, I LIKE it.\n\nThanks & 73,\nJim\[email protected]\n\n\nBill Ress wrote:\n\n>Hi Juan,\n>\n>Yeh after looking at the schematic - I was afraid that might happen but \n>didn't know what sort of isolation the logic switch would provide.\n>\n>The 10 MHz circuit I used in the S2 concept downverter shuts down the \n>Vcc to the internal 10 MHz when it detects the presence of the external \n>10 MHz.\n>\n>Perhaps John can look at the circuit I used and determine if its useful.\n>\n>Regards...Bill - N6GHz\n>\n>Juan Rivera wrote:\n>  \n>\n>>All,\n>>\n>>Here’s a plot of frequency drift in the 70 cm Receiver – first on \n>>internal reference, then on external reference:\n>>\n>>The first part of the plot is with the receiver and the signal \n>>generator set to 435.500000 MHz on internal reference. You can see the \n>>slow steady drift upwards of about 15 Hz over a period of about 5 \n>>minutes. Then I reinitialized the receiver for the external reference. \n>>It locked right up and the output was exactly 10.700000 MHz where it \n>>stayed.\n>>\n>>The most important thing I noticed is not on this graph… With internal \n>>reference selected, but while feeding 10 MHz into the external \n>>reference input, (as it might be configured in flight) the two \n>>reference signals are beating together. It wasn’t until I started \n>>listening to the output of the receiver by patching it into a \n>>distribution amplifier so I can feed my counter, the SDR-IQ, the \n>>TS-2000, and the HP 8566B all at once that I noticed it. The result is \n>>that the input signal is FM modulated by the beat between the two \n>>reference oscillators. I also noticed some unexplained jumps in \n>>frequency that I have not yet been able to capture. I’ll dig into this \n>>again when I have more time.\n>>\n>>73, Juan\n>>\n>>    \n>>\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\n\n",
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