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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/W5HFXO7TFYS4TQVD2AS7RHBJLM4ET5OA/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "[email protected]",
    "message_id_hash": "W5HFXO7TFYS4TQVD2AS7RHBJLM4ET5OA",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/A6GZLYCUJK4PETLB2KWMOYCTJBYNDCAC/?format=api",
    "sender": {
        "address": "grant (a) ghengineering.co.uk",
        "mailman_id": "74a4d29508634e669020884f51007f55",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/74a4d29508634e669020884f51007f55/emails/?format=api"
    },
    "sender_name": "Grant Hodgson",
    "subject": "[eagle] Re: New 70 cm Receiver Test Results",
    "date": "2007-06-10T07:42:29Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/YIMBCL566LEEOMJSCSCCAUQVGBKC552V/?format=api",
    "children": [
        "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/WGCMO46RTI6ZQLMV5WK3XNANWDHMLNDZ/?format=api"
    ],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Juan\n\nThe VCO control line will be extreemly sensitive to noise; testing VCOs \nwith a power supply often gives more data about the power supply noise \nthan the VCO performance.  If you want to open the loop and control the \nVCO directly, I would suggest controlling the VCO using a battery with a \npotentiometer (10 turn if possible, or 'padded down' with resistors to \ngive a reduced VCO control range) and maybe a large value parallel \ncapacitor or two.\n\nregards\n\nGrant G8UBN\n\nJuan Rivera wrote:\n> John,\n> \n> I’ll tackle that tomorrow.  For this prototype we can actually do \n> exactly what you suggest and just move the PCB back one set of standoffs \n> and leave the Can-Do module where it is.  Of course the SMA connectors \n> will be inaccessible with the cover on but I don’t run it that way when \n> testing anyway, so it won’t matter.\n> \n> Getting the Can-do module desoldered won’t be much fun but it should be \n> possible.  That’s a job for next week.  I think I’ll find tomorrow that \n> U17 is also a contributor to the noise.  Perhaps I should cut into the \n> VCO control loop and control the VCO with an external supply if it \n> starts to look like a culprit.  Right now I’m out of variable supplies \n> since all three are tied up.   I don’t have an oscilloscope that I trust \n> but I may be able to use the SDR-IQ with a scope probe to look at the \n> VCO control loop since it goes down to 500 Hz.  That will be an \n> interesting test.  This little radio is very useful.\n> \n> 73,\n> \n> Juan\n",
    "attachments": []
}