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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/D6QSZKQDRL6QWXFLH4AO75CETBHBV7VW/?format=api",
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    "message_id": "CAO-vtPN=_en+2yjAwB8QkKSO0rEXH1tqhbxJiLjpn9nFux_+nA@mail.gmail.com",
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    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/JPU67PPKXXRIDNGRFCSZ4UGDS5PK6ACG/?format=api",
    "sender": {
        "address": "kb5wia (a) amsat.org",
        "mailman_id": "a631ac9574fc43afb1d08bf5e7164c19",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/a631ac9574fc43afb1d08bf5e7164c19/emails/?format=api"
    },
    "sender_name": "David Palmer KB5WIA",
    "subject": "[amsat-bb] Re: VO-52 Frequency Drift",
    "date": "2012-03-27T18:45:38Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/JPU67PPKXXRIDNGRFCSZ4UGDS5PK6ACG/?format=api",
    "children": [],
    "votes": {
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        "status": "neutral"
    },
    "content": "Nice observations there, John.  I too have noticed frequency drift of\na similar magnitude to what you describe below.  Just about every time\nI work a VO-52 pass I need to reset the frequency calibration on\nSatPC32 up or down a few hundred Hz.\n\nOne thing I thought was interesting from last night's overhead pass\n(3/27/2012 around 0320z) was that close to mid-pass, there seemed to\nsuddenly be a very large amount of noise (almost sounding like hash\nfrom a microwave oven) coming through the passband.  At the time, I\nwas the only station on the sat, calling CQ with my 0.5 watts, and a\nvery nice quiet clean downlink.   When the noise came, it virtually\ndrowned out my input signal, even going up to 5 watts.  The noise\nlasted about 30 seconds and then faded out -- it seemed to occupy most\nof the passband.  After the noise dissipated, I was surprised that I\nhad to reset my SatPC32 calibration by about 200 Hz.  I found this\nreally interesting, the seeming coincidence between the noise and the\nfrequency offset changing rather suddenly during a pass.  The\ngraphical plot of the sat path showed it starting the pass just barely\ntouching the sun line, and ending with the footprint a good ways in --\nmaybe as the satellite entered more sun exposure its temp increased,\ncausing the freq shift and possibly a bit of oscillation causing the\nnoise??   Could just have been me, of course, but it would be\ninteresting if anyone else has noticed these things.\n\nDave KB5WIA\n\nOn Tue, Mar 27, 2012 at 8:41 AM, John Papay <[email protected]> wrote:\n> There were three passes of VO-52 here this morning, 27March2012.\n> I was able to copy the beacon on all three passes.  Here are the\n> results:\n> 1200utc 145862.6\n> 1335utc 145861.7\n> 1510utc 145861.9\n>\n> The frequencies are not exact. My CW offset is 850Hz.  There is\n> significant frequency drift and temperature is probably the cause.\n> It would be interesting to hear from the control team regarding\n> this.\n>\n> HO-68 provides an excellent check of your doppler compensation in\n> your tracking program.  I find that the beacon is always very strong\n> and the frequency is rock solid.  You can save the frequency in your\n> program and a month later find that it is right where it was the month\n> before.  If you can listen to the beacon with your CW filter on throughout\n> the entire pass, you have everything set right, keps, computer clock etc.\n> The doppler gets quite severe on a high pass and is a great way to make\n> sure you have everything set right.  Since HO-68 is on UHF, everything\n> becomes more critical.\n>\n> 73,\n> John K8YSE\n\n",
    "attachments": []
}