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    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/M5TNLYIQISYLRA7MLGRM65FVOQKJYHL7/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "[email protected]",
    "message_id_hash": "M5TNLYIQISYLRA7MLGRM65FVOQKJYHL7",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/A6GZLYCUJK4PETLB2KWMOYCTJBYNDCAC/",
    "sender": {
        "address": "juan-rivera (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "Juan Rivera",
    "subject": "[eagle] Re: New 70 cm Receiver Test Results",
    "date": "2007-06-08T13:16:11Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JMTIHPBJGANYKO5Z53YTOGMIIK6CWJDA/",
    "children": [],
    "votes": {
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        "status": "neutral"
    },
    "content": "Tom,\n\nJohn had also asked me to adjust the power supply voltage slowly over its\nentire input range while watching for spurs.  I couldn't see anything with\nmy spectrum analyzer but the SDR-IQ's noise floor is much lower and it's\nvery fast.  I'll try that test this weekend.  Those spurs might be switching\nnoise from the supply.\n\nOne of the few pieces of test equipment I actually purchaed new was a\nlow-cost tektronix oscilloscope.  It's about 15 years old now and not\nfunctioning all that well.  I'll give the SDR-IQ a try with a scope probe on\nthe PLL loop and report back this weekend.\n\n73,\n\nJuan\n\n\nOn 6/7/07, Tom Clark, K3IO <[email protected]> wrote:\n>\n> Juan -- a couple of thoughts that came to my mind based on your blow-by-blow\n> report:\n>\n>    1. You might command a move off 435.000. As I recall, the\n>    synthesizer reference is at 10.000 MHz. I could conceive an internal\n>    spur generated by the reference oscillator.\n>    2. The 6.8 kHz spur interval is certainly weird, but it sounds like\n>    it might be due to the synthesizer chip's RC low-pass filter with a\n>    time constant ~ 1/6.8 kHz = ~140µs. Is it possible that something inside the\n>    loop is oscillating? Try a scope probe on the VCO's tuning voltage.\n>    3. On topic #2, is it possible that you can see microphonic on the\n>    tuning voltage?\n>    4. I'm interested to see that you also find the IQ as a very useful\n>    piece of test equipment. Here is another test you might want to try:\n>    Remember that the IQ does down to (nearly) DC. You could try using it to\n>    look at the spectrum of the synthesizer tuning voltage over the ~0-20\n>    kHz range. If the chip is locked, there should be very little noise;\n>    but with the spectrum you are showing, I wouldn't be surprised to see noise\n>    that mimics the 10.7 MHz power spectra you show here<http://www.juanr.com/pages/hobbies/ham_radio/Eagle/Testing_Resumed.htm>\n>\n> 73, Tom\n>\n>\n>\n>\n>\n\n\n",
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