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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/7WXYXW6LEGLRLF2VYPJAOOY3IZT7XXWC/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "7WXYXW6LEGLRLF2VYPJAOOY3IZT7XXWC",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/PFUGZ676R3TJDCZDCVW676TCFQKJQ2C2/",
    "sender": {
        "address": "kk7p (a) wavecable.com",
        "mailman_id": "ecaeda8313f54fe6b33b16a345e6ba3a",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/ecaeda8313f54fe6b33b16a345e6ba3a/emails/"
    },
    "sender_name": "Lyle Johnson",
    "subject": "[eagle] Re: 70 cm Receiver IF Spurs - Problem Solved",
    "date": "2007-06-18T04:23:48Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/RWNG7D6DQJJJFSKOEQLT46OS3SEB4BTN/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hello Juan!\n\n> The uglier this gets the more interesting I find it!  I hope no one is\n> getting disheartened.  After all, this is why we all got involved in the\n> first place, isn't it?  If it was easy it would be boring.\n\nNo one is bored... :-)\n\n> I just cooked up an idea for a noisy power source that could be used during\n> payload development and test.  I stuck my write up and a block diagram at\n> the end of my current log.  \n> \n> Here's the link:\n> http://www.juanr.com/pages/hobbies/ham_radio/Eagle/Spur_Suppression.htm\n> \n> What do you think?\n\nIt would be nice to be able to add to the bench supply output a noise \nsource capable of a volt or more at whatever current the D.U.T. might \nrequire.  Maybe an amplifier we can feed with a function generator to \nsimulate a sawtooth or ??? waveform from a few kHz to a few tens of kHz \nto better simulate the assumed dirty power source?\n\nWe really need to get an idea what to expect worst case from the S/C \npower system.\n\n> Shielding the CAN-Do inductor obviously won't solve all these problems but\n> it might buy back 2 inches of space and that's worth the effort.\n\nYes, we need to shield this if we can.\n\n> Lyle,\n> \n> My suspicion is that the two VCOs on this receiver are also the most\n> susceptible to radiated EMI from CAN-Do.  I can't say for sure but it looks\n> that way to me.  Both are in metal cans soldered to ground.  The closest one\n> was about 2 inches away from the CAN-Do inductor.  I've more than doubled\n> that distance to 4-1/4 inches to get away from it.  That's a lot of EMI!\n\nIndeed it is.  We should try and find a toroidal inductor to minimize \nradiation, then put a magnetic shield around it to suppress what the \ntoroid radiates.\n\n73,\n\nLyle KK7P\n\n",
    "attachments": []
}